How to put a low speed fan on a Chevy Tahoe?

Now the low speed fan trigger needs to be connected to the PCM. Remove the PCM from its mounting bracket and unplug the wiring harness, which is held in with one screw. Unscrew it and slowly wiggle it side to side until it comes loose. You will need to insert a pin into an empty slot, pin 42 on the side that says “BLUE”.

How to test the blower fan control switch?

This is good and is the correct and expected test result that tells you that the blower fan switch (in the A/C-Heater control panel) is OK. Your next step is to bypass the blower resistor using a simple jumper wire. For this test go to: TEST 2: Using A Jumper Wire To Bypass The Blower Switch.

What is the trigger wire on a Chevy Tahoe 99-02?

But on a 99-02, the PCM only has pin 42 available to use. The other trigger wire has to be connected to the AC compressor clutch relay wire.

Where do I get the fans for my Chevy Silverado?

I got my fans from a 2006 Chevy Silverado in the junkyard. I was also able to pick apart the wiring harness and get that as well. I even got the pin that needs to be added to the PCM harness. So now I have an OEM wiring harness complete with fan relays. This actually clips right onto the side of your underhood fuse panel once you remove the cover.

How do you change the fan on a GMC Truck?

Now that the wiring is squared away, on to the actual fan swap. First, you need to remove your air intake tube. Next, you want to remove the upper half of your fan shroud, which is held on with two 10mm bolts on the top, and two plastic push rivets on each side.