Symptoms of a Bad or Failing Cooling Fan Resistor

Our certified mechanics come to you · 12-month, 12,000-mile warranty

GET A QUOTE Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of Replacing a Bad or Failing Cooling Fan Resistor

Common signs include the engine overheating, cooling fan only working at certain speeds, and the fan never turning off. Our certified technicians can come to you and diagnose the problem. You will receive a $30 credit towards any follow-up repairs that result from the diagnostic. Following are example prices for Cooling Fan Resistor Replacement. Click on the button below to get an upfront quote for your car.

Cars Estimate Parts Cost Labor Cost Savings Average Dealer Price
2008 Chevrolet Equinox $131 $60.77 $70.00 22% $168.27
2003 Chrysler Town & Country $131 $60.77 $70.00 22% $168.27
2013 Chevrolet Avalanche $131 $60.77 $70.00 22% $168.27
2010 Cadillac CTS $131 $60.77 $70.00 22% $168.27
2008 Cadillac Escalade EXT $131 $60.77 $70.00 22% $168.27
2007 Ford Mustang $131 $60.77 $70.00 22% $168.27
GET A QUOTE FOR YOUR CAR Get a fair and transparent estimate upfront

How to Diagnose a Bad or Failing Cooling Fan Resistor?

Cooling fan resistor

Virtually all modern vehicles built today use electric cooling fans to help pull air through the radiator to keep the engine cool. Once the coolant temperature sensor detects that the engine temperature has exceeded acceptable levels, the cooling fans will be activated to keep the engine cool. Many vehicles come equipped with cooling fans that operate on more than one speed setting. This is made possible by routing their power through the cooling fan resistor. The cooling fan resistor is an electrical resistor that limits power to the fan in steps, so that the fan can operate at different speeds according to the cooling system’s demands. Since power to the cooling fan is sometimes routed through the cooling fan resistor, when it fails or has any problems, it can cause issues with the regular operation of the fans, which can lead to overheating. Usually a bad cooling fan resistor will produce a few symptoms that can alert the driver of a potential problem that should be serviced.

1. Engine overheats

One of the first symptoms of a potential problem with the cooling fan resistor is engine overheating. If the cooling fan resistor fails or has any issues, it can cause power to be cut off from the cooling fans, which can lead to overheating. Any sort of overheating issue should be tended to as soon as possible to avoid the possible engine damage.

2. Cooling fan speed issues

Another symptom of a possible problem with the cooling fan resistor is issues with the cooling fan speed. If the resistor breaks or has any issues it may cause the fans to only function on certain settings. The cooling fan resistor is meant to send power to the fans in steps, so that the fans may operate at different speeds. If any of the individual steps or switches fail, it will disable the cooling fans from operating on that speed setting. You may notice that the cooling fans only operate at one speed, when they used to operate on two or more.

3. Cooling fans never turn off

Another symptom of a potential problem with the cooling fan resistor is cooling fans that stay on at all times. If the resistor shorts or fails, it can cause the cooling fans to stay on even when they are not supposed to. In certain cases, the cooling fans may even stay on when the vehicle is turned off, and will create a large parasitic drain that will eventually kill the battery.

The cooling fan resistor is an important component, as it is one of the components that routes power for the cooling fans. For this reason, if you suspect that your cooling fan resistor may be having an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if your car needs a cooling fan resistor replacement.

Resistor
Cooling System
fans

Fast and easy Cooling Fan Resistor Replacement service at your home or office.

GET A QUOTE FOR YOUR CAR
Get a fair and transparent estimate upfront

More related articles

How Long Does a Fuel Filler Neck Last?
Getting gas from the pump to your gas tank is the only way to keep a car going. The fuel filler neck is a metal tube that is welded to the...
How to Find the Keyless Code on a Ford Explorer or Mercury Mountaineer
Many Ford Explorers and Mercury Mountaineers were manufactured with an option known as the Ford keyless entry keypad. Some models refer to it as SecuriCode as well. It...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...

Related questions

Q: Q: Door lock problems

Hi there. There is a resistor for the door locks that keep a voltage on the driver door lock cylinder to activate the secondary door locks electronically. If the resistor is leaking (losing power) it tends to cause the door...

Q: Hello I have a 2009 nissan murano and it's overheating do you know what the problem could be?

If you have replaced the thermostat, there could be a couple of other issues relating the cooling system, such as the coolant fan switch relay or a clogged system. The coolant fan switch relay tells the coolant fans when to...

Q: Overheating when fans off

Hello! It sounds like the system is working properly. The fans are designed to turn on when the engine reaches a certain temperature. However if the fans do not work properly the vehicle will overheat. If the vehicle has an...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com