Horn is not working.
Here's a link to your horn wiring,first check both horns to see if wire has came loose,you have 2 horns,high and low. Repair Guides Truck Horns AutoZone com
SOURCE: Replace the thermostat on 2002 GMC Envoy
4.2L Engine the thermostat and the neck where the hose goes on is one unit $25 at autozone
SOURCE: Need firing order diagram for 2002 gmc envoy
one, five, three, six, two, four
The plastic intake should have this sequence molded into it somewhere, and even the corresponding cylinder numbers in front of their respective holes. Have fun, and thanks for posting on Fixya.com
SOURCE: Speedometer on 2004 GMC Envoy not working. It
There is a recall on the panel Cluster... call your dealer and have it checked out.. mention the recall... www.lemonauto.com
SOURCE: 2002 gmc envoy shuts off when i turn on the ac whil ideling
If it does it when idling I would suspect an IAC motor (Idle Air Control). If it is opening too slowly the added air the motor needs will not be supplied fast enough and the engine will kill.
It could be other things also but this is where I would start.
SOURCE: 2002 GMC Envoy..Air works fine out of passenger
blend door actuator needs to be replaced. dual climate controls have one for each side.
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