I just replaced my thermostat on my GMC Envoy with a 4.2 liter engine and now the fan clutch does not disengage. Could I have somehow messed up some other wiring like the temperature sensor that would cause the clutch to not disengage or does the fan clutch now need replaced again?
Kirkasmann, P1481 is most definitely your fan clutch, it's very common on our platform. Only wires to check is the connection on the drivers side shroud. You said replaced "again"?. I've had bad ones out of the box, or it would tick tick tick. Buy a lifetime warrantly fan clutch for this reason, plus it's easy to do (as long as you cut a notch in the top of the shroud where the upper radiator hose is).
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: A/C compressor/pulley clutch does not disengage.
It may be a bad low pressure cut out switch. You would have to hook the system to a set of gauges and look at the pressures. The low side should cut out at aprox.20 psi. if the switch is bad the compressor will keep running and ice up. The switch is easy to replace. It screws into the dryer (big silver can} it has two wires going to it. It's a cheep fix to try at home.
SOURCE: Removing the fan clutch
get a big adjustable wrench and insert it in the bolt and hammer it fast in one blow that should solve your problem
SOURCE: replace my thermostat
well do you have the 4.2 or 5.3 motor 6cy or 8cy need to know and i can help
SOURCE: How do I replace a thermostat in a 2004, 6
If you go to www.trailvoy.com and do a search on thermostat replacement, you will find a thread that details the process.
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I disconnected and reconnected the connection to fan clutch and it still will not disengage. I went to Autozone yesterday and had them plug in to the computer to get the codes and P1481 shows up, and I was told that I will have to go to the dealer to find out the problem. It also indicated that my cam position sensor problem and that the timing was advanced.
Any suggestions? Please let me know. Thank you!
The fan clutch is electric, maybe you accidentally pulled the wire off when changing the thermostat. They are made to be fail save so if it looses voltage it will engage so the car dosn't overheat, check your wires closely.
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