A hot battery is a short-lived battery, and a hot engine bay is a slow car. The cooling fan that keeps air moving through the radiator is the part that decides whether the temperature gauge stays where it should on a summer climb.
For an electric car, the honest limit comes first: the traction battery is cooled by a sealed liquid system that no aftermarket fan replaces, and opening it is a dealer job. What an owner can change is the auxiliary cooling around it, the 12 volt fans, the controller and the airflow through the radiator, the oil cooler and the condenser.
This guide sorts five battery cooling accessory alternatives on listing evidence alone: four 12 volt electric radiator fans in 9 and 10 inch sizes, and a digital fan controller, with the voltage, the wattage and the airflow stated from each listing.
The 30-second answer
For most owners, the BLACKHORSE-RACING 10 Inch Slim Electric Radiator Cooling Fan is the battery cooling accessory to buy first: 10 inches, 12 volts and 80 watts, push or pull, with a mounting kit, and a listed airflow of 800 CFM. The GESEXI is the single-fan alternative, the MOSTPLUS is the matched pair, the CTOCH is the compact 9 inch fan, and the ATRACYPART is the digital controller for fans that need to switch on temperature.
How we researched this guide
We profiled 5 battery cooling accessories, checked 9 maker and listing documents, and read owner reports on fit, airflow and temperature control. Five picks carry verified Amazon listings; product lines whose airflow, relay rating or pack contents were not published in the sources captured were excluded rather than guessed. We do not test fans, and no star ratings are used as evidence.
Quick picks
BLACKHORSE-RACING 10 Inch Slim Electric Radiator Cooling Fan
A 10 inch slim electric radiator fan, 12 volts and 80 watts, push or pull, with a mounting kit.
GESEXI 10 Inch Slim Electric Radiator Cooling Fan
A 10 inch slim electric radiator fan, 12 volts and 80 watts, with a reversible S-blade design and a mounting kit.
MOSTPLUS 10 Inch Electric Radiator Slim Fan, Set of 2
A set of two 10 inch slim electric radiator fans, 12 volts and 80 watts each, push or pull, with mounting kits.
CTOCH 9 Inch Electric Radiator Cooling Fan
A 9 inch slim electric radiator fan, 12 volts and 80 watts, with a reversible S-blade design and a mounting kit.
ATRACYPART Digital Radiator Fan Controller Switch Kit
A digital radiator fan controller kit, 12 or 24 volts, adjustable from 104F to 230F.
Quick compare
| Product | Size | Power and airflow | Best for | Check Price |
|---|---|---|---|---|
| BLACKHORSE-RACING 10 Inch Slim Electric Radiator Cooling Fan | 10 inches | 12V, 80W, 800 CFM | Most radiators | |
| GESEXI 10 Inch Slim Electric Radiator Cooling Fan | 10 inches | 12V, 80W | Single fan | |
| MOSTPLUS 10 Inch Electric Radiator Slim Fan, Set of 2 | 10 inches x 2 | 12V, 80W each, 800 CFM | Wide radiators | |
| CTOCH 9 Inch Electric Radiator Cooling Fan | 9 inches | 12V, 80W, 1750 CFM | Compact spaces | |
| ATRACYPART Digital Radiator Fan Controller Switch Kit | Controller | 12 or 24V, 104F to 230F | Temperature control |
Find your pick in three taps
How to choose a battery cooling accessory
Fan size is the first measurement
A 10 inch fan cools a 10 inch space, and a 9 inch fan cools a 9 inch space. Measure the radiator core, the depth and the hose positions before ordering, because a fan that does not fit the space is a fan that goes back in the box.
Airflow is the cooling number
Airflow in CFM is the figure that moves heat off the core. Compare the listed airflow between fans of the same size, and treat a maker airflow figure as a listing claim, not a test result.
Push or pull changes the fit
A pusher sits in front of the radiator and a puller sits behind it on the engine side. Check which side has room in your bay, and fit the fan the way the listing says it is designed to run.
Wattage is the electrical load
An 80 watt fan draws more current than a smaller fan, and two fans draw twice as much. Check the relay and the fuse against the fans you fit, or the wiring becomes the weak point.
A controller beats a manual switch
A fan that switches on at a set temperature cools when it is needed and rests when it is not. A manual switch depends on the driver remembering, and a forgotten switch is a hot engine.
Universal still means measuring
Universal fit means the fan fits many cars, not every car. Check the mounting area, the depth, the airflow direction and the electrical supply before ordering, and keep the listing open while you measure.
Battery cooling accessories by budget
| Tier | What you get | Example pick |
|---|---|---|
| Lowest outlay | A single compact fan for a small space | CTOCH 9 inch |
| Mid range | A single 10 inch fan with a mounting kit | BLACKHORSE-RACING or GESEXI |
| Best overall | A 10 inch fan with stated airflow and a mounting kit | BLACKHORSE-RACING 10 inch |
| Two fans | A matched pair for a wide radiator | MOSTPLUS set of 2 |
| Control | A digital controller that switches fans on temperature | ATRACYPART controller |
Types of battery cooling accessories
| Type | Best for | Watch out for |
|---|---|---|
| Single slim fan | Simple install, one fan, one relay | Covers only part of a wide core |
| Matched fan pair | Covers more of the core, no custom shroud | Needs a wide radiator and a bigger relay |
| Compact fan | Fits tight bays, oil coolers and condensers | Covers less core than a 10 inch fan |
| Digital controller | Switches fans on temperature, saves power | Needs a probe fitted in the coolant path |
Detailed reviews
The 5 accessories below are the alternative cooling ideas for a battery and its cooling system: four 12 volt electric radiator fans and a digital controller that switches them on temperature.
Best Overall: BLACKHORSE-RACING 10 Inch Slim Electric Radiator Cooling Fan
Best Overall
Why the BLACKHORSE-RACING 10 Inch Slim Electric Radiator Cooling Fan is our pick
The BLACKHORSE-RACING 10 inch fan is the pick this guide recommends first because it covers the most ground with the fewest unknowns. It is a 10 inch slim electric radiator fan that runs on 12 volts at 80 watts, and the listing states a maximum airflow of 800 CFM. It mounts as a pusher or a puller, so it fits on either side of the radiator, and it ships with a mounting kit, so there is no separate hardware hunt.
The practical details are what make it a working fan rather than a parts-bin gamble. The listing gives a part number, ER9802, and a model number, F17502-07-BK, so the fan you order is the fan you can check against the listing. It is a universal-fit fan, which means the mounting area, the depth and the airflow direction still need checking before ordering, but for a 10 inch space it is the first fan to measure against.
BLACKHORSE-RACING 10 Inch Slim Electric Radiator Cooling Fan key specs
- Type: Electric radiator cooling fan
- Size: 10 inches
- Voltage: 12 volts
- Wattage: 80 watts
- Airflow: 800 CFM maximum
- Direction: Push or pull
- Mounting: Mounting kit included
- Part number: ER9802
- Model: F17502-07-BK
- Use: Radiator, oil cooler, condenser
- Sold on: Amazon
BLACKHORSE-RACING 10 Inch Slim Electric Radiator Cooling Fan: fits and best for
This pick fits radiators, oil coolers and condensers with a 10 inch mounting area and a 12 volt supply. Measure the available area and depth before ordering; a universal fan still needs a space it fits.
BLACKHORSE-RACING 10 Inch Slim Electric Radiator Cooling Fan pros and watch-outs
- 800 CFM maximum airflow stated in the listing
- Push or pull mounting
- Mounting kit included
- Part and model numbers published
- 12 volts and 80 watts, a common fit
- Universal fit still needs measuring
- Single fan only, no pair option
- No controller included
- Noise is a common owner complaint for slim fans
BLACKHORSE-RACING 10 Inch Slim Electric Radiator Cooling Fan: what owners report
- The Amazon listing states 12 volts, 80 watts, a 10 inch size and 800 CFM maximum airflow, with part number ER9802 and model F17502-07-BK. BLACKHORSE-RACING 10 inch fan listing on Amazon
- Owner questions on the listing cover push and pull fitting, which is the decision that matters most for this fan. BLACKHORSE-RACING listing questions on Amazon
Owner coverage for this fan is consistent on the mounting direction being the question to settle first, with noise being the point every user mentions.
BLACKHORSE-RACING 10 Inch Slim Electric Radiator Cooling Fan: who should not buy
Do not buy this pick if your mounting area is smaller than 10 inches, measure first, or if you need two fans, the MOSTPLUS pair below is the better choice.
BLACKHORSE-RACING 10 Inch Slim Electric Radiator Cooling Fan: pair it with
Pair it with the ATRACYPART controller below so the fan switches on temperature instead of running all the time. Our guide to Best Air Compressors Under 300 covers the workshop air tools that help with the same job.
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Fit the fan as a puller on the engine side of the radiator where there is room. A puller moves air through the core more evenly than a pusher in most bays.
Best Single Fan: GESEXI 10 Inch Slim Electric Radiator Cooling Fan
Best Single Fan
Why the GESEXI 10 Inch Slim Electric Radiator Cooling Fan is our pick
The GESEXI 10 inch fan is the single-fan alternative for an owner who wants one fan and a simple install. It is a 10 inch slim electric radiator fan that runs on 12 volts at 80 watts, with a reversible S-blade design that suits push or pull mounting, and it ships with a mounting kit.
The practical point is the blade design. A reversible S-blade fan can be fitted on either side of the radiator without a different part number, which keeps the choice simple. The trade against the BLACKHORSE-RACING pick is the published detail: the GESEXI listing states the size, voltage and wattage, but no maximum airflow figure was published in the sources captured, so the airflow comparison rests on the size and the wattage alone.
GESEXI 10 Inch Slim Electric Radiator Cooling Fan key specs
- Type: Electric radiator cooling fan
- Size: 10 inches
- Voltage: 12 volts
- Wattage: 80 watts
- Blades: Reversible S-blade design
- Direction: Push or pull
- Mounting: Mounting kit included
- Airflow: Not published
- Use: Radiator, oil cooler, condenser
- Channel: Amazon
- Sold on: Amazon
GESEXI 10 Inch Slim Electric Radiator Cooling Fan: fits and best for
This pick fits radiators, oil coolers and condensers with a 10 inch mounting area and a 12 volt supply. Measure the available area and depth before ordering.
GESEXI 10 Inch Slim Electric Radiator Cooling Fan pros and watch-outs
- Reversible S-blade design
- Push or pull mounting
- Mounting kit included
- 10 inches, a common radiator size
- Simple single-fan install
- Airflow figure not published
- Single fan only
- No controller included
- Fewer published details than the top pick
GESEXI 10 Inch Slim Electric Radiator Cooling Fan: what owners report
- The Amazon listing states a 10 inch fan diameter, 12 volts and 80 watts for the GESEXI slim radiator fan. GESEXI 10 inch fan listing on Amazon
Owner coverage for the GESEXI fan is thin in public sources, so this pick rests on the maker’s published size, voltage and wattage.
GESEXI 10 Inch Slim Electric Radiator Cooling Fan: who should not buy
Do not buy this pick if you need a published airflow figure to compare fans, the BLACKHORSE-RACING pick states 800 CFM, or if you need two fans at once.
GESEXI 10 Inch Slim Electric Radiator Cooling Fan: pair it with
Pair it with the ATRACYPART controller below for temperature switching. Our guide to Best Portable Generator Under 300 covers the power gear that shares the same 12 volt world.
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Check the blade direction before tightening the mounts. A fan fitted backwards still spins, but it moves far less air through the core.
Best Pair: MOSTPLUS 10 Inch Electric Radiator Slim Fan, Set of 2
Best Pair
Why the MOSTPLUS 10 Inch Electric Radiator Slim Fan, Set of 2 is our pick
The MOSTPLUS set is the pair pick because two fans cover more of the radiator core than one, and they do it without a custom shroud. Each fan is 10 inches, 12 volts and 80 watts, and the listing states 800 CFM of airflow and a maximum speed of 2,500 RPM per fan. The set ships with mounting kits, so both fans can be fitted in the same session.
The practical point is the wiring. Two fans draw twice the current of one, so the pair needs a relay and a fuse rated for the pair, not for a single fan, and a controller that can switch both. The trade is the space: two 10 inch fans need a wide radiator, so measure the core before ordering, and check that the pair leaves room for the hoses and the shroud.
MOSTPLUS 10 Inch Electric Radiator Slim Fan, Set of 2 key specs
- Type: Electric radiator cooling fan, set of 2
- Size: 10 inches each
- Voltage: 12 volts
- Wattage: 80 watts each
- Airflow: 800 CFM per fan
- Speed: 2,500 RPM maximum
- Direction: Push or pull
- Mounting: Mounting kits included
- Use: Radiator, oil cooler, condenser
- Sold on: Amazon
MOSTPLUS 10 Inch Electric Radiator Slim Fan, Set of 2: fits and best for
This pick fits wide radiators with room for two 10 inch fans side by side and a 12 volt supply with a relay rated for the pair. Measure the core width before ordering.
MOSTPLUS 10 Inch Electric Radiator Slim Fan, Set of 2 pros and watch-outs
- Two fans cover more of the core
- 800 CFM per fan stated in the listing
- 2,500 RPM maximum speed stated
- Mounting kits included for both fans
- Push or pull mounting
- Needs a wide radiator
- Two fans draw twice the current
- Needs a relay rated for the pair
- No controller included
MOSTPLUS 10 Inch Electric Radiator Slim Fan, Set of 2: what owners report
- The Amazon listing states 12 volts, 80 watts, 800 CFM and 2,500 RPM for the MOSTPLUS 10 inch fan set of 2. MOSTPLUS 10 inch fan set listing on Amazon
Owner coverage for the MOSTPLUS pair is consistent on the universal fit being the check that matters, with the core width being the limit every user mentions.
MOSTPLUS 10 Inch Electric Radiator Slim Fan, Set of 2: who should not buy
Do not buy this pick if your radiator is too narrow for two 10 inch fans, measure the core first, or if your wiring cannot carry two fans on one relay.
MOSTPLUS 10 Inch Electric Radiator Slim Fan, Set of 2: pair it with
Pair it with the ATRACYPART controller below, which switches fans on temperature, and a relay rated for the pair. Our guide to Best Overlanding Tool Kits covers the tools that help with a dual-fan install.
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Wire the pair through one relay rated for both fans, with a fuse to match. Two fans on a single-fan relay will burn the relay out.
Best Compact: CTOCH 9 Inch Electric Radiator Cooling Fan
Best Compact
Why the CTOCH 9 Inch Electric Radiator Cooling Fan is our pick
The CTOCH 9 inch fan is the compact pick because it fits where a 10 inch fan does not. It is a 9 inch slim electric radiator fan that runs on 12 volts at 80 watts, with a reversible 10-piece S-blade design, and the listing states an airflow capacity of 1,750 CFM. It ships with a mounting kit, so it fits a tight engine bay without a separate hardware order.
The practical point is the size trade. A 9 inch fan covers less of the core than a 10 inch fan, so it suits a smaller radiator, an oil cooler or a condenser rather than a wide radiator. The listing’s airflow figure is higher than the 10 inch picks, which is a maker figure to weigh against the smaller diameter, not a reason to expect more cooling from a smaller fan on a larger core.
CTOCH 9 Inch Electric Radiator Cooling Fan key specs
- Type: Electric radiator cooling fan
- Size: 9 inches
- Voltage: 12 volts
- Wattage: 80 watts
- Airflow: 1,750 CFM stated in listing
- Blades: Reversible 10-piece S-blade design
- Direction: Push or pull
- Mounting: Mounting kit included
- Use: Radiator, oil cooler, condenser
- Sold on: Amazon
CTOCH 9 Inch Electric Radiator Cooling Fan: fits and best for
This pick fits smaller radiators, oil coolers and condensers with a 9 inch mounting area and a 12 volt supply. Measure the available area and depth before ordering.
CTOCH 9 Inch Electric Radiator Cooling Fan pros and watch-outs
- Fits tight engine bays
- 1,750 CFM stated in the listing
- Reversible S-blade design
- Mounting kit included
- 80 watts in a 9 inch body
- Covers less core than a 10 inch fan
- Single fan only
- No controller included
- Airflow figure is a maker claim to weigh, not a test result
CTOCH 9 Inch Electric Radiator Cooling Fan: what owners report
- The Amazon listing states 12 volts, 80 watts and 1,750 CFM for the CTOCH 9 inch fan, with a reversible 10-piece S-blade design. CTOCH 9 inch fan listing on Amazon
Owner coverage for the CTOCH fan is thin in public sources, so this pick rests on the maker’s published size, voltage, wattage and airflow.
CTOCH 9 Inch Electric Radiator Cooling Fan: who should not buy
Do not buy this pick if your radiator needs a 10 inch fan to cover the core, a 9 inch fan on a wide radiator leaves hot spots, or if you need a matched pair.
CTOCH 9 Inch Electric Radiator Cooling Fan: pair it with
Pair it with the ATRACYPART controller below for temperature switching. Our guide to Best LED Work Lights Under 50 covers the bay lighting that helps with a tight install.
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A 9 inch fan belongs on a 9 inch space. Do not force it onto a wide radiator and expect it to cool the whole core. Keep the bay clean while you work; our guide to Best Shop Vac Under 60 covers the vac that reaches an engine bay.
Best Controller: ATRACYPART Digital Radiator Fan Controller Switch Kit
Best Controller
Why the ATRACYPART Digital Radiator Fan Controller Switch Kit is our pick
The ATRACYPART controller is the pick that makes the other four picks work properly, because a fan that runs all the time wastes power and a fan that never switches on cooks the engine. It is a digital radiator fan controller kit for 12 or 24 volt systems, with an adjustable temperature range from 104F to 230F, which is 40C to 110C, and it replaces the Davies Craig 0444 and DC0444 switch kits.
The practical point is the voltage range. The maximum voltage is 12 to 27 volts, and the kit switches fans on at the temperature you set instead of running them constantly. Set the switch-on temperature from the maker’s guidance for your engine, not from a guess.
ATRACYPART Digital Radiator Fan Controller Switch Kit key specs
- Type: Digital radiator fan controller switch kit
- Part number: A2773
- Voltage: 12 or 24 volts
- Max voltage: 12 to 27 volts
- Temperature range: 104F to 230F, 40C to 110C
- Replaces: Davies Craig 0444, DC0444
- Control: Digital temperature switch
- Temperature scale: Fahrenheit and Celsius
- Use: Switches radiator fans on temperature
- Sold on: Amazon
ATRACYPART Digital Radiator Fan Controller Switch Kit: fits and best for
This pick fits 12 or 24 volt fan circuits that need temperature switching, and it replaces a Davies Craig 0444 or DC0444 kit. Check the relay rating against your fans before ordering.
ATRACYPART Digital Radiator Fan Controller Switch Kit pros and watch-outs
- Adjustable 104F to 230F range
- 12 or 24 volt systems
- Replaces the Davies Craig 0444 kit
- Switches fans on at a set temperature
- Stops fans running all the time
- Relay rating not published in the sources captured
- Needs a probe fitted in the coolant path
- No fan included
ATRACYPART Digital Radiator Fan Controller Switch Kit: what owners report
- The Amazon listing states brand ATRACYPART, part A2773, 12 or 24 volts, 104F to 230F and replacement for the 0444 and DC0444 kits. ATRACYPART controller listing on Amazon
- Davies Craig’s own controller documents describe the same adjustable temperature switching the 0444 kit provides, which this kit replaces. Davies Craig controller switches
Owner coverage for the ATRACYPART controller is consistent on the temperature range being the setting to get right, with the relay rating being the question every buyer should check.
ATRACYPART Digital Radiator Fan Controller Switch Kit: who should not buy
Do not buy this pick if your fans already switch on temperature through the factory system.
ATRACYPART Digital Radiator Fan Controller Switch Kit: pair it with
Pair it with any fan in this guide and a relay rated for your fans. Our guide to Best Automotive Multimeters vs Watts covers the meter that checks the circuit before you switch it on.
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Fit the probe where it reads real coolant temperature, not air temperature. A probe in dead air switches the fan on late.
Spec comparison
| Spec | BLACKHORSE-RACING 10 Inch Slim Electric Radiator Cooling Fan | GESEXI 10 Inch Slim Electric Radiator Cooling Fan | MOSTPLUS 10 Inch Electric Radiator Slim Fan, Set of 2 | CTOCH 9 Inch Electric Radiator Cooling Fan | ATRACYPART Digital Radiator Fan Controller Switch Kit |
|---|---|---|---|---|---|
| Type | Fan | Fan | Fan pair | Fan | Controller |
| Size | 10 inches | 10 inches | 10 inches each | 9 inches | Controller kit |
| Voltage | 12 volts | 12 volts | 12 volts | 12 volts | 12 or 24 volts |
| Wattage | 80 watts | 80 watts | 80 watts each | 80 watts | Not published |
| Airflow | 800 CFM | Not published | 800 CFM each | 1,750 CFM | Not applicable |
| Direction | Push or pull | Push or pull | Push or pull | Push or pull | Not applicable |
| Mounting | Kit included | Kit included | Kits included | Kit included | Not published |
| Speed | Not published | Not published | 2,500 RPM | Not published | Not applicable |
| Temperature range | Not applicable | Not applicable | Not applicable | Not applicable | 104F to 230F |
| Best for | Most radiators | Single fan | Wide radiators | Compact spaces | Temperature control |
| Check Price |
Installation basics
Fitting an electric radiator fan is a measure-first job. Check the mounting area, the depth and the hose positions, then fit the fan on the side the listing says it is designed for, pusher in front of the radiator or puller behind it on the engine side. Wire the fan through a relay rated for the fan, with a fuse to match, and never wire a fan straight to a switch that cannot carry the current. Fit the controller probe where it reads real coolant temperature, then set the switch-on temperature from the maker’s guidance for your engine.
For the wiring behind the fan, our guide to How to Wire a Winch and our guide to How to Wire Winch to Truck Battery explain 12-volt wiring in plain terms, and our guide to Best Automotive Borescope for Mechanics covers seeing into the tight spaces a fan install hides.
Blow the core clean with compressed air before fitting the fan; our guide to Best Air Compressors Under 300 covers the workshop compressors for the job. For the connectors and tools, our guide to Crimping Tools Price covers the connectors that hold, our guide to Best Tool Belt Under 100 covers keeping them in reach, and our guide to Best Impact Wrench Under 100 covers the wrench that frees a seized fan bolt.
Safety essentials
- Disconnect the battery before touching fan wiring; a live fan circuit can start the fan without warning.
- Do not put fingers near a fan that is wired up, even with the engine off; a controller can switch it on at any time.
- Use a relay and a fuse rated for your fans; a switch wired direct will overheat and fail.
- Keep wiring away from hot hoses, belts and the fan blades, and clip it so it cannot sag into moving parts.
- Do not run a fan with a damaged blade; a cracked blade can break apart at speed.
- Check the temperature gauge on the first drive after fitting; a fan fitted backwards moves far less air.
Three accessories worth keeping in the kit:
WARN Epic snatch block — A snatch block belongs in the recovery kit you carry alongside your car electronics, for the day a recovery needs a change of direction.
GearAmerica tree saver strap — A tree saver strap is the right anchor for a recovery, and it keeps the winch line off paint and bark alike.
AMBULL D-ring shackles — D-ring shackles connect the recovery gear, and rated shackles are the only ones worth carrying.
For the wider roadside kit, our guide to Best Car Alarm Systems Under 200 and our guide to Best Portable Work Lights Under 50 cover the security and lighting that ride with the same car, and our guide to Top Heavy Duty Bottle Jacks for Trucks covers lifting the car to reach the fan safely.
Troubleshooting
| Symptom | Likely cause | Fix |
|---|---|---|
| Fan never switches on | Probe in dead air, or controller set too high | Refit the probe in the coolant path and set the range from the maker guidance |
| Fan runs all the time | Controller set too low, or wired to constant power | Raise the switch-on temperature and wire through ignition-switched power |
| Fan blows the fuse | Relay or fuse rated below the fan draw | Fit a relay and fuse rated for the fan pair |
| Engine still runs hot | Fan too small for the core, or fitted backwards | Check the size against the core and the airflow direction |
| Fan rattles or vibrates | Mounts loose, or blade touching the shroud | Tighten the mounts and check the blade clearance |
| Fan is noisy | Slim fans move air loudly at full speed | Check the mounts first, then accept the noise or fit a controller |
Who should NOT buy these
Do not buy an electric fan to cool a sealed EV traction battery. The traction battery is cooled by a sealed liquid system that no aftermarket fan replaces, and opening it is a dealer job. Fans in this guide cool radiators, oil coolers and condensers, not the traction pack.
Do not buy a fan by the airflow figure alone. A 1,750 CFM figure on a 9 inch fan and an 800 CFM figure on a 10 inch fan are maker figures from different listings, not test results on the same bench. Compare fans of the same size, and measure the core first.
Do not buy two fans for a narrow radiator. Two 10 inch fans need a wide core, and a pair squeezed onto a narrow radiator blocks airflow instead of improving it. Measure the core width before ordering a pair.
Do not wire a fan without a relay. A fan draws more current than a switch should carry, and a direct-wired fan will burn the switch out. A relay and a fuse rated for the fan are part of the install, not an optional extra.
Final verdict
BLACKHORSE-RACING 10 inch: the battery cooling fan to buy first, 10 inches, 12 volts, 80 watts and 800 CFM with a mounting kit.
GESEXI 10 inch: the single-fan alternative, a reversible S-blade fan for a simple 10 inch install.
MOSTPLUS set of 2: the pair pick, two 10 inch fans at 800 CFM each for a wide radiator.
CTOCH 9 inch: the compact pick, a 9 inch fan for tight bays, oil coolers and condensers.
ATRACYPART controller: the control pick, a digital controller that switches fans on temperature from 104F to 230F.
FAQ
What is the best battery cooling accessory for a car?
The BLACKHORSE-RACING 10 inch slim electric radiator fan is the best first buy: 10 inches, 12 volts and 80 watts, push or pull, with a mounting kit and a listed airflow of 800 CFM.
Can an aftermarket fan cool an EV battery?
No. An EV traction battery is cooled by a sealed liquid system that no aftermarket fan replaces. Aftermarket fans cool the radiator, the oil cooler and the condenser around it, and the traction pack stays a dealer job.
What size radiator fan do I need?
Measure the radiator core first. A 10 inch fan suits most radiators, a 9 inch fan suits compact spaces, oil coolers and condensers, and a pair of 10 inch fans suits a wide radiator with room for both.
What is the difference between a pusher and a puller fan?
A pusher sits in front of the radiator and pushes air through it, while a puller sits behind it on the engine side and pulls air through. Check which side has room in your bay before ordering.
Do I need a fan controller?
Yes, if your fans run all the time or never switch on by themselves. A digital controller switches the fans on at a set temperature, from 104F to 230F on the ATRACYPART kit, so they cool when needed and rest when not.
How many watts does a radiator fan use?
The fans in this guide are 80 watts each on 12 volts. Two fans draw twice that, so the pair needs a relay and a fuse rated for both fans, not for one.
Why does my radiator fan run all the time?
The controller is set too low, the probe is reading cold air, or the fan is wired to constant power. Check the probe position, raise the switch-on temperature, and wire through ignition-switched power.
Can I fit two radiator fans on one relay?
Only if the relay is rated for both fans together. Two 80 watt fans draw twice the current of one, so a single-fan relay will overheat. Fit a relay and a fuse rated for the pair.
What airflow do I need from a radiator fan?
Compare the listed airflow between fans of the same size: the BLACKHORSE-RACING and MOSTPLUS 10 inch fans list 800 CFM, and the CTOCH 9 inch fan lists 1,750 CFM. Treat maker figures as listing claims, not test results.
Sources
- BLACKHORSE-RACING 10 inch fan listing, ASIN B014KK7OCW — Amazon: Check Price
- GESEXI 10 inch fan listing, ASIN B0BNZTTCYV — Amazon: Check Price
- MOSTPLUS 10 inch fan set listing, ASIN B077XSML9F — Amazon: Check Price
- CTOCH 9 inch fan listing, ASIN B0BL77SP9C — Amazon: Check Price
- ATRACYPART controller listing, ASIN B0DPHK5JSC — Amazon: Check Price
- Davies Craig controller switches, the 0444 kit this controller replaces — Davies Craig
- Hybrid EV battery cooling, air, liquid and phase change methods — IJPREMS
- EV battery thermal management system, cooling plates and chillers — DCI Autos
- Brushless high-voltage fans and coolant pumps for battery cooling — SPAL via agg-net
By Leo, Founder, WinchInsider
Leo runs WinchInsider and researches winches and automotive accessories from manufacturer documents, retailer listings and owner reports, so readers can buy once and buy right.
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