Introduced in 1998, the GMC Envoy is an SUV manufactured by General Motors. Air conditioning problems in the GMC Envoy can often be resolved with a little time and detective work.
If cold air fails to blow through the vents in a GMC Envoy, a bad blower motor resistor may be to blame. Check the resistance in the blower motor circuit with a 12-volt test light and compare the results to the proper voltage specified in the owner's manual. If voltage remains lower than indicated in the manual, change the blower motor resistor.
A refrigerant leak can cause the GMC Envoy A/C system to produce less cold air. Check the condenser and evaporator for a pinhole leak, broken O-ring seal or torn hoses and make the necessary replacements.
The GMC Envoy A/C system may not function due to compressor failure resulting from lack of lubrication. Compressor lubrication loss can be caused by a clogged orifice tube, which in turn stops oil and refrigerant from reaching the compressor. Check the orifice for signs of blockage and replace the compressor as needed.
