truck overheating when idling

[ANTHONY Summers]

I was wondering if someone could give me some suggestions to check and see why the fan isn't kicking on when idling or stopped at a redlight. could it be the temperature sensor behind the drivers side rear cylinder close to the firewall or a bad relay. If it is a relay where is it?

the temperature reads on the instrument panel but the fan does not come on unless the A/C is on. I know the fan has two speeds one when the air conditioner is on and on to keep the truck cool at idle.

Thanks in Advance.

Anthony

 

[Dave2018]

Well you have half the battle. At least you know it isn't the fans themselves. Do you have a wiring diagram? If the sensor isn't impossible to get to, it might be the cheapest option to try first.

The sensor is here:




Looks like it's going in the fusebox under the hood. I think it's called the TIPM

The fan controller.





Edit: Checked my Haynes Repair Manual for 2009- 2018 in section 3-4 it states:

7. If the fan motor is okay but isnt coming on when the A/c is selected or the engine gets hot then the fan relay might be defective. A relay is used to turn the fan on and off based on a control decision by the PCM (power control module) These control module circuits are fairly complex and checking them should be left to a dealer service department or other qualified repair shop. Sometimes the control system can be fixed by simply identifying and replacing a bad relay.

 

[15 Handicap]

At what temp should it come on?

 

[Burla]

If it is TIPM, very easy to test and even bypass with a relay you don't need such as cig lighter. Unless you feel like shelling out between 1 and 2 grand for a new TIPM. You can even fix TIPM, that is another video, requires a lil electrical knowhow. You just need to buy that little wire with light.