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Dont have cold AC

Morgan1986

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Morgan1986 Senior Enthusiast

Morgan1986

Posted
Posted

So go to recharge the system it has a high presure on it in the red . The compresser is working and the lines are really cold but all I get is coolish air coming out .

 

I might have blender door problems not sure would that cuase the issues .

 

It seems my system is charge . I am not getting cold air.

 

Advice?

 

SnakeEyeSS Senior Enthusiast

SnakeEyeSS

Posted
Posted

Was it working before the last charge? Yes blender door issues can cause havic on GMs.

 

Other thoughts....is the compressor cycling? Even if its a long cycle you might catch it when its powering down which will show high pressure readings.

 

THis might sound odd, but put a can of coolant on the fill line and start the truck when its cold, put the ac on max and two minutes later open the can and put a little in. Just a min or so, not enough to hurt anythingb or raise the pressure much. close off the can and disconnect the guages and then reconnect gauges and check again.

 

Ive seen this work in similar situations, maybe air in the line or something. Or is its low on coolant

Morgan1986 Senior Enthusiast

Morgan1986

Posted
  • Author
Posted

I had an issue similar once ended up being the damper control for the dual zone.

I notice my driver side blend door acuator is not working . So I tried disconecting the black cable to recalibrate nonthing did not move. So I took it off and opened it up looked fine . Turned it on to see if the gears would spin they spined for a while and stoped . Then I tried moving the switch up and down to see if the gears would move . They would not move .

 

So I turned the knob the acuator suppose to turn to cold to see if the AC would work . It seemed to work I will know on a drive latter . Do I need a new blend door acuator becuase the gears look fine just does not seem to want to work when I move the switch up and down from cold to hot. Is there a fuse for the passager blend door acuator ?

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

no to a fuse ....yes to computor controlled system,,,,data on a scanner will show position of doors

 

no guessing ,,,,!!!!

 

have system recovered ,see how much comes out ,,,,,,put back in the required amount ,,,,,,no guessing or assumptions ya hear !!!? lol

Morgan1986 Senior Enthusiast

Morgan1986

Posted
  • Author
Posted

oh and now my thermostat is not working again and I just changed it this last winter ...... starting to really dislike the gm 800s for realibility on hvac controls and other little things.

chevydriver37 Enthusiast

chevydriver37

Posted
Posted

Been a long while since I've been up here, but I just went thru this with my '07 Sierra about 2 months ago. Air was running warm, cooling fans weren't coming on, etc., so I added a can of 134, and some leak dye. That lasted about a week, and it went bad again.

 

Went to my tech-buddy, and he scanned everything, commanded everything on and off, etc., and it was good. We couldn't see anything as far as leakage from the dye, so he suggested a can of Super Seal. Got it at Advance Auto, for about 25 bucks.

 

We evacuated everything (not much came out), put in 1 can of 134, the sealer, and the second can of coolant, and away she went. The fans came on, the air was super cool, and it seems to have worked. Had 34-36 degrees at the vent.

 

I've since traded the ol' girl in on a 2013 Silverado and LOVE it. Kinda gutless with the 3:42 gears, but I'm not towing anymore, so it's not a concern. Now it's time load up on the accessories!!

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