When do the fans come on low or high?

When do the fans come on low or high?

The fans come on low when the A/C is on, or the coolant temperature is above a comfortable level, and they come on high speed if the coolant temperature approaches 240 F. The simplest way to check them is to turn on the A/C and see if the fans are on low speed.

What kind of fan does a Mustang have?

Your vehicle fan is controlled by two different relays in the engine compartment fuse box. One is for low speed and the other is for high speed. The ECM controls both of the relays. The wires to the cooling fan motor are black (ground) brown (high speed) green with white stripe (low speed).

What should I do if my AC Fan does not turn on?

With the engine running and the A/C turned on, check for power getting to the low or high power wires to the cooling fan motor. If you do not have power to the low power wire, then try to replace the relay first. You may be able to temporarily swap the high and low speed relays to test to see if fan is coming on with A/C on.

Why is my radiator fan not turning when the a / C is on?

You may be able to temporarily swap the high and low speed relays to test to see if fan is coming on with A/C on. If it does, then try and replace both relays since they may both be burnt. If you find you are getting power to the cooling fan motor but it is not turning, then you have a defective motor.

Why does my PCM not turn on the fans?

You are looking to see if the PCM sends power to one or both relays to turn on the coolant fans. This should happen as the high side of the system approaches 214 psi. If it exceeds this amount of pressure and the system doesn’t turn on, one of the sensors in the system that the PCM uses to know when to turn the system on and off has failed.

Why are my cooling fans not turning on?

If the compressor is running long enough to build heat in the high side of the system, and the cooling fans don’t turn on, I would begin finding the fan relays and add power to the appropriate circuit to see if the fans turn on at all. This will require a wiring diagram.

What to do when your AC fan won’t shut off?

Associate Degree 2,609 satisfied customers 05 Durango ac– pressure goes over 300 on gh side and shuts 05 Durango ac– pressure goes over 300 on high side and shuts off compressor–spray water on condenser and compressor will restart or turn ac off and let cool for about 30 minutes and it will come bac…