Air conditioner

Asked by May 04, 2017 at 09:47 AM about the 2004 GMC Sierra 2500 4 Dr SLT 4WD Crew Cab SB

Question type: General

The air is working but their is like and air mist that is
coming out in the driver side or at least you can see
the air is this something I need to be worried about
the air is really cold

1 Answer


Not to worry. This normal to sometimes see a fog of moisture or even ice crystals when your system is working really well and it is condensing off the moisture in the air around you. Like exhaling on a very cold day. I would guess it is very humid where you are. A revved up engine makes the A/C work even better, sometimes to a point where your evaporator (in the "heater box") ices over and blocks your air flow. If that happens, turn off the A/C until the ice melts off and drips a puddle under your truck. When you turn your A/C back on, run your fan even faster, but don't run it on "Max A/C", so to keep it from refreezing. I have lots of refrigeration experience and get this question all the time. Your A/C is running fine!

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