Cooling fans not working

The cooling fan usually will not kick on until you reach about 210-240 degrees depending on the signal specs for low speed operation and high speed operation. That is why it is recommended when bleeding the cooling system to usually raise the rpm's to 2500 with heater on until the fans come on. If the fans do not come on then you will see the vehicle start to overheat. You just maybe trying to chase a problem that is not present? So try that first to see if the fans come on or if it overheats.

Does the vehicle overheat before it gets in the red zone? If it does then replace the radiator cap if not then look at the coolant temp switch on intake manifold beside thermostat housing.

Okay. We need to start with what the BCM is seeing as the coolant temp. The way this works is the BCM monitors the temp and when it gets high it tells the PCM to ground the relays and turn the fans on. This means we need to see if the BCM is seeing the proper temp. If it is then we need to look at the PCM to see if it is getting the command to turn them on. If it is getting the command then we can assume that the PCM is the issue.

However, I attached the testing for the fans. It is lengthy but it will lead us to the issue as well.

Let me know if you have questions or what you find. Thanks

There are two coolant temperature sensors on the engine one on top and one on left side in the cylinder head for the cooling fan it has one wire and it grounds the relay when car overheats. You can ground it for a test be sure to check the fuses and relays first. I am attaching wiring diagrams fuse and relay location below for you to refer to. Let us know if this information was helpful and if you need more information.

Thank you
Joe T.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Good afternoon.

Does the A/C system even work? If it does, it should kick the fan on once the high side gets to 150 lbs.

Did you test for power to the fans?

Roy

Okay, so it will not activate the fan for the A/C until the system is charged.
I sent you a diagram for the circuit.

Check the two listed fuses for power on both sides with a test light or voltmeter.

Roy

Sounds like a plan.

Roy

You have to realize that these fans are not supposed to turn on at that temperature. They are not programmed to turn on until approximately 223 degrees and that is low speed as they are two speed fans. High speed does not kick until 232 degrees. It is possible to have low speed circuit only burned out but you will not know at that temperature. That would be a fuse, wiring or relay problem.

Was the idle ok before you worked on it? Any connectors--vacuum lines, anything that might have come loose? Take the throttle cable loose from throttle-body and cruise control, any difference? What about the idle air control?

Block off the mouth of the air-intake/throttle-body, any effect on the idle? Should be a big effect? Check for applicable trouble codes. At the least, you need an obd2 code reader to check codes.

There is a sensor in the engine as well as a relay. Either one of these could be bad as well as a fuse or the fan motor itself. They all need to be checked out.