A/C Problems - Cold then HOT then Cold then Hot!!!!! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-20-2006, 09:32 PM   #1
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Default A/C Problems - Cold then HOT then Cold then Hot!!!!!

It has been a while since I last posted but here goes......

I gave the 97 to my daughter in January, she lives in Orlando and I in Arizona so I cant look at what you may recomend.
She called yesterday and said that the AC was blowing HOT air from the vents, I asked which vents, she said the dash vents. She also said that it never got cold, she drove to work and it was still HOT. She later left work and it worked like it should, COLD all the way home. She called again today and the same thing happened, she went off to work and it was HOT and blowing hard through the dash vents.

Any ideas I can relate to her?

thenks, Nick
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Old 04-20-2006, 09:44 PM   #2
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Can she check and see if the compressor is running each time? (Not running when it blows hot, and running when cold.) If it is running when cold, does it run most of the time at idle, or keep cycling on and off? It could just be low on freon, or have a bad pressure switch.
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Old 04-20-2006, 11:34 PM   #3
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Originally Posted by Archon
Can she check and see if the compressor is running each time? (Not running when it blows hot, and running when cold.) If it is running when cold, does it run most of the time at idle, or keep cycling on and off? It could just be low on freon, or have a bad pressure switch.
First of all, check the heater control valve and see that the dial is set all the way to the left. She might not have twisted it back to the cold side after using the heater. If she didn't, it'll blow hot.

I did that once. Pretty embarrassing, but when I moved it back from all the way right to all the way left, I had cold air again.
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Old 04-20-2006, 11:44 PM   #4
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Can she check and see if the compressor is running each time? (Not running when it blows hot, and running when cold.) If it is running when cold, does it run most of the time at idle, or keep cycling on and off? It could just be low on freon, or have a bad pressure switch.
First of all, check the heater control valve and see that the dial is set all the way to the left. She might not have twisted it back to the cold side after using the heater. If she didn't, it'll blow hot.

I did that once. Pretty embarrassing, but when I moved it back from all the way right to all the way left, I had cold air again.
sorry I had to re register under another name, my account is screwed up.

The unit in the 97 is a ECC not the dial type.
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Old 04-20-2006, 11:49 PM   #5
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I guess the only thing to check before you go further then is that the ECC temp is set way lower than the outside air temperature.

Good luck.
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Old 04-20-2006, 11:53 PM   #6
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I guess the only thing to check before you go further then is that the ECC temp is set way lower than the outside air temperature.

Good luck.
Orlando Fla.
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I think it would be set lower, she said she had it set at 65.

By the way Bob, your UIM that I got from you must be still working just fine, I haven't had a call from her about any coolant problems.... thought you might like to know
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Old 04-21-2006, 12:09 AM   #7
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I had a similar problem with my '95, when you started it up it would go to full hot, then back to almost cold. If the car was already hot and it was a hot day, it sure wasn't pleasent to get blasted with that hot air everytime you started the car. The problem was the heater door actuator(not the controler) , and since you had to practicly tear the dash out to get to it, I took it to the dealer. The part was like $100.00 and nearly $500.00 labor to install it.


T.B.
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Old 04-21-2006, 01:07 AM   #8
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By the way Bob, your UIM that I got from you must be still working just fine, I haven't had a call from her about any coolant problems.... thought you might like to know
Sure do, and thanks. I have about 45K on mine and Mark (Vital49) is about the same, so we're slowsly creeping up on the usual failure time for the stock uppers.

I'm pretty sure we're all OK. Keep your fingers crossed anyway.

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Old 04-21-2006, 08:45 AM   #9
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Nick..I'd run with the possible low freon /pressure switch for starters.

Both can cause issues and if pressure/freon levels are near the threshold, intermittant conditions could easlily occur.
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Old 04-21-2006, 10:02 AM   #10
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Nick..I'd run with the possible low freon /pressure switch for starters.

Both can cause issues and if pressure/freon levels are near the threshold, intermittant conditions could easlily occur.
would a code show up if it is the pressure switch?
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