Did you recently ad stop leak to your radiator? Could be blockage. Feel for heat on the rubber hoses going into the the firewall. If one side is warm and the other stays cool, then something could be blocking the heater core.
Check for fan control module. Usually under dash near glove box.
SOURCE: 2004 GMC Envoy has trouble idling
Try the fuel filter. Sounds like the engine might be running rough due to weak fuel pressure. Its cheaper to replace, especially if it's still original from 04. Try running some injector cleaner through a couple of tanks of high octane gas.
SOURCE: blower motor wont shut off
Check your blower resister in duct right in from of motor. These tend to burn out and short every once in a while
SOURCE: Fan blower motor
The Canyon has an inherint problem with the Fan Power cable being loose. When I say loose...I'm saying that you need to adjust the wires and then take a zip strip to tighten it up.
Passenger side under the dask are 2 cable hook ups. the one on the farthest right (Only 2 wires going to the plug) is the fan power cable. Jiggle it while the fan is on position number3 so you can hear when it comes on!!!
SOURCE: The button on our 2004 GMC Envoy gear shift will not depress when
The brake rlease switch for the gearshift might need adjusted-replaced or the shifter itself might need adjusted
SOURCE: what is the best type of motor oil for 2004 GMC
this engine calls for any major brand 5W20W (I prefer Valvoline), in very hot climates u can use 10W30W, but no heavier.
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It was just working tonight and I hit the off button and it didn't shut off also turned the car off and it was still going
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