Table of Contents
What does an auxiliary fan resistor do?
The purpose of the cooling fan resistor is to remove heat from the engine’s coolant and from the A/C refrigerant. The resistor does this by drawing air through the radiator and air conditioning condenser.
How do you test a cooling fan relay?
The quickest way to tell whether or not the electric fan(s) are working is to start the engine, let it reach normal operating temperature and then turn the A/C on. The cooling fan in the engine compartment should turn on to pull air through the radiator and A/C condenser.
How do I know if my cooling fan resistor is bad?
Usually a bad cooling fan resistor will produce a few symptoms that can alert the driver of a potential problem that should be serviced.
- Engine overheats. One of the first symptoms of a potential problem with the cooling fan resistor is engine overheating.
- Cooling fan speed issues.
- Cooling fans never turn off.
How do I test a fan motor with a multimeter?
To test your motor for short to ground, you’ll need to set the multimeter to ohms and disconnect the motor from its power source. Then inspect each wire and look for infinite readings. Alternatively, if you get a reading of 0, you might have a cable issue.
What happens when a cooling fan resistor goes bad?
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.
How do you know if a fan resistor is bad?
Symptoms of a bad heater blower motor resistor
- Fan does not work at all, so no air comes out of the vents.
- Fan only works on some speeds and not others.
- Fan only works on the highest speed.
- Fan runs all the time and can’t be controlled with the fan switch.
- You see smoke coming out of the vents.
Where is the resistor on a Ford blower motor?
Ford blower motor resistor. It’s located inside the dash, often on the opposite side of the steering wheel or inside the engine compartment on the firewall. In most modern cars, the speed of the blower motor can be adjusted gradually. The electronic module that controls the speed of the blower motor is called a blower motor control module.
When do you need a radiator fan resistor?
Fixed Ford Focus issue with engine fan not running at low power, resolving overheating issue. The fan would only run at high power when AC was on, but not under normal conditions. The resistor is needed when the fan is triggered to run at low power (which is probably 90% of most driving, at least when AC is off).
What happens to a resistor on a blower fan?
Resistors have it rough. They always have electricity flowing through them, and the voltage can change sharply as you adjust the strength of the blower fan. If a motor finds it harder to move because of jamming or worn bearings, it can raise the resistor’s temperatures to dangerous levels.
How big is a Dorman radiator fan resistor?
Dorman 902-219 3.2 ounces 4.8 x 3.6 x 3.2 inches Taiwan 902-219 No Ready To Paint If Needed 902-219 4U2Z14S411DA; F5RZ8L603AC No COOLING FAN RESISTOR Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service. Would you like to tell us about a lower price? All Balls. Video Player is loading.