The cooling fan clutch may fail causing excessive fan noise and/or the Check Engine Light to illuminate.Google+
Car Problem Reports
GMC Envoy Cooling Fan Clutch May Fail Causing Noise and Check Engine Light
GMC Envoy Problem
Engine Affected: 4.2L 6 Cylinder
Average Mileage: 95,261 mi (12,400 mi - 150,100 mi)
Visitor, 2002 GMC Envoy, 90,000 mi
Fan Clutch will fail, causing the cooling fan to be locked on. This results in loss of engine power, reduced fuel mileage, and a sound like there is a jet engine under the hood when accelerating. If you accelerate too hard it will set a check engine light condition for excessive fan speed.
Visitor, 2002 GMC Envoy, 134,000 mi
Have had this problem off and on. It stopped working but then restarted working. One mechanic said it wouldn't really cause any problems. Cost to fix now 261.00 for part + labor.
Visitor, 2003 GMC Envoy, 4.2L 6 Cylinder, 84,000 mi
Radiator fan runs very fast and very loud when I step on the gas with low power.
Visitor, 2002 GMC Envoy
Fan clutch failure. Replacement of the fan clutch was $750.
Visitor, 2003 GMC Envoy, 4.2L 6 Cylinder, 138,000 mi
Hayden Fan Clutch Thermal Fan Clutch went out causing water pump to go out. Had to replace Fan Clutch and water pump.
Visitor, 2005 GMC Envoy, 4.2L 6 Cylinder, 75,000 mi
Cooling Fan Clutch when out, it cost 1,300 for repairs!
Is the code for this problem P1484