My 2006 GMC Envoy heater fan has stopped working. I checked the switch and it is good. I didn't know how to get to motor itself to check it there. Any suggestions?

Check for power at the fan motor.

each fan also has a relay ,, check that

If it only happens in cold weather, check your intake manifold bolts for tightness. #5 & #6 by the firewall are easiest to check. Some people will find these not even hand tight = rough running car.

However, if (when cold) your car is vibrating at idle IN GEAR and stopped, this would be a motor mount on Envoys and Trailblazer, very common.


Fan shouldn't turn by itself, you may have a bad fan clutch.

If high speed went out first, then it is the switch.
There is the most arcing in the switch at high speed.
If there was motor or relay trouble, it would effect all speeds.
If there were problems with the ballast resistor, it would effect lower speeds.

Check all electrical conections. If they are good then it is probably the switch itself.

check the fuses if thay are good replace with new blower motor

Either the switch or the resistors on the blower. Get shop manual remove switch and jump terminals the manual tells you to do to check switch. If a-ok then do checks for the resitor on the blower motor. Hopefully its the switch.
Good luck

Blower motor resistor is most common ($20-$70) it controls the blower motor fan and speeds or fan relay fuse (usually under the hood) If it's not either then the blower itself is bad. You can pull the motor and apply 12volts to it to test, if it spins then the resistor.

the fan motor needs a new relay its a harness under the dash pretty simple to replace

fan blower speed switch under hood usually in fire wall or in heater box under dash area if you do not change it you will keep losing all your speeds until nothing left! it is not!!!!the one in your dash that you hand operate! hope this helps.John