Having problems with your 2003 GMC Sonoma Extended Cab ?
Is the a/c compressor supposed to cycle while the heat is on? This is on a 2003 GMC Sonoma 4.3
On many GM products, yes, the AC compressor can and sometymes does stay active whenever the climate system is operating. If there is an AC button that allows compressor disengagement, you should turn it off (so the AC light turns off but the blower fan is still on) and that will prevent AC from cycling on and also increase mileage and power. Some GMs with auto climate control (caddys especially) there is no manual control of compressor and the body computer will cycle it even if the current settings are for heat. This is normal on some vehicles.
Yes it keeps the humity out of the air in you car
Repair Help & Product Troubleshooting for 2003 GMC Sonoma Extended Cab
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