99 Sierra AC Issue: It's getting hot down here... - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-12-2012, 09:30 AM   #1
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Default 99 Sierra AC Issue: It'* getting hot down here...

AC works fine. It'* cold and it blows, but after ~10 minutes it just stops being cold (but still blows).

I checked the refrigerant with manifold gauges. It'* good.

I'm stumped. Where do I check from here?

Thanks all.
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Old 04-12-2012, 09:42 AM   #2
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theres a actuator in the duct under there that controls the temp, see if thats moving right
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Old 04-12-2012, 09:53 AM   #3
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Quote:
Originally Posted by jwfirebird View Post
theres a actuator in the duct under there that controls the temp, see if thats moving right

Thank You, JW. Can you tell me where that actuator is. I'll go look now.

There are two actuators, driver and passenger side. Is that right?

Thanks again.
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Old 04-12-2012, 10:00 AM   #4
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should be 3 probably ive never had to replace one myself. one for each side and one to switch between vent floor and front. should look like this and the shaft should move visibly

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Old 04-12-2012, 10:28 AM   #5
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Found one on the passenger side. I found the actuator that controls Floor/Defrost/Vent etc. That one is moving and working fine. Of course, that'* not what I need. It looks identical to the one you posted from Amazon.

I'll keep looking. The dash is off the truck, so hopefully this will be easier.

Just to be clear, the other two should look or function about the same way and control "barn doors".

The AC doesn't start blowing hot. I just loses its cold.
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Old 04-12-2012, 10:34 AM   #6
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I think the second is under the glove box. I am going to pull that off now. I'll report back.

Thanks for you help, JW.
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Old 04-12-2012, 11:33 AM   #7
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I found the second temperature control. It'* fine. Working normal.

I'm think compressor clutch now?
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Old 04-12-2012, 01:11 PM   #8
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well you said you checked it with gauges, was that while it was malfunctioning or working? does it do it just sitting there or does it while your driving?
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Old 04-12-2012, 03:05 PM   #9
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Quote:
Originally Posted by jwfirebird View Post
well you said you checked it with gauges, was that while it was malfunctioning or working? does it do it just sitting there or does it while your driving?
Driving and sitting idle. I rented the gauges and put them on after the temperature of the AC went down while idling. A/C was at max. Pressure was fine.

If I turn the truck off for 2 minutes, then turn it back on, I get cold air again.
If I turn the AC off while driving, then turn in on after 2 minutes, I get cold air again.
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Old 04-12-2012, 05:13 PM   #10
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next i would back probe the plug for the clutch and see if its getting power while it malfunctioning or if something is shutting it down
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