'95 88 AC issue. - 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 04-04-2007, 12:09 PM   #1
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Default '95 88 AC issue.

'95, 88 with analog dash. I had the ac system checked and all was good in relation to pressures and proper amount of R134. The problem seems to be in the heat control. It will not allow cool air to flow thru. I noticed the problem even with it on "vent". Only hot air comes out. I suspect the dash mounted temp control is not allowing the heater control valve to close or one of the duct doors is not operating as it should. When you activate the AC/Heat/Vent control, I can hear the duct doors move. The guy who checked the AC system concured with these possible problem areas. The compressor will come on, but it cycles on and off rapidly. I did a site search but could not find anything on this problem so I am asking for some help here. Its fixin to get real hot here.
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Old 04-04-2007, 12:30 PM   #2
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Default Re: '95 88 AC issue.

Quote:
Originally Posted by 57lxi
'95, 88 with analog dash. I had the ac system checked and all was good in relation to pressures and proper amount of R134. The problem seems to be in the heat control. It will not allow cool air to flow thru. I noticed the problem even with it on "vent". Only hot air comes out. I suspect the dash mounted temp control is not allowing the heater control valve to close or one of the duct doors is not operating as it should. When you activate the AC/Heat/Vent control, I can hear the duct doors move. The guy who checked the AC system concured with these possible problem areas. The compressor will come on, but it cycles on and off rapidly. I did a site search but could not find anything on this problem so I am asking for some help here. Its fixin to get real hot here.
Although this is an 88 and not a Bonne, the syptoms and fix are similar.

Most likely, your airmix door actuator has a cracked or failed internal gear. Does the '95 88 have dual climate control?

Do a search using "airmix+actuator" and you should have all the information needed to have cold air again. Post here if you have further questions and we will try to guide you the best that we can.
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Old 04-04-2007, 12:54 PM   #3
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Thanks for the quick response and tip on where to search. And no, my rig does not have the dual climate control. Thanks again for the help. I will post what I find when I get it figured out so the next guy will know.
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Old 04-04-2007, 01:19 PM   #4
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Cool (no pun intended). Again, if you need further help or have questions, please ask.
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Old 04-04-2007, 03:02 PM   #5
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Default Re: '95 88 AC issue.

Quote:
Originally Posted by 57lxi
'95, 88

The guy who checked the AC system concured with these possible problem areas. The compressor will come on, but it cycles on and off rapidly. I did a site search but could not find anything on this problem so I am asking for some help here. Its fixin to get real hot here.
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Old 04-04-2007, 03:03 PM   #6
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Default Re: '95 88 AC issue.

Quote:
Originally Posted by 57lxi
'95, 88 with analog dash. I had the ac system checked and all was good in relation to pressures and proper amount of R134. The problem seems to be in the heat control. It will not allow cool air to flow thru. I noticed the problem even with it on "vent". Only hot air comes out. I suspect the dash mounted temp control is not allowing the heater control valve to close or one of the duct doors is not operating as it should. When you activate the AC/Heat/Vent control, I can hear the duct doors move. The guy who checked the AC system concured with these possible problem areas. The compressor will come on, but it cycles on and off rapidly. I did a site search but could not find anything on this problem so I am asking for some help here. Its fixin to get real hot here.
The fact that the compressor cycles on and off rapidly doesn't sound right. Is it a V5 constant on compressor?
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Old 04-04-2007, 03:30 PM   #7
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Good point, imidazol. I am not 100% sure, but I believe that the '95 88 had the compressor that cycled, but again, I am not positive.
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Old 04-04-2007, 05:10 PM   #8
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Low freon charge will cause a compressor to cycle on and off quickly.
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Old 04-04-2007, 05:38 PM   #9
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Quote:
Originally Posted by Echo SSEI
Good point, imidazol. I am not 100% sure, but I believe that the '95 88 had the compressor that cycled, but again, I am not positive.
Next question is whether the inlet to the evaporator is cold from the freon and what the outside temperature is. I had one car that would cycle quickly when it wasn't really warm outside or humid which drains a lot of BTUs into the evaporator and freon keeping it on longer. My 93 leSabre had the cycling compressor; 98 has V555 which stays on and adjusts the pump amount--unless the low pressure switch would be turning it on and off from an almost low freon charge. which could be this case.

since he had it checked by an air conditioning guy, I'd think the charge would be okay--but...
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Old 04-04-2007, 05:48 PM   #10
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Quote:
Originally Posted by imidazol
Next question is whether the inlet to the evaporator is cold from the freon and what the outside temperature is. I had one car that would cycle quickly when it wasn't really warm outside or humid which drains a lot of BTUs into the evaporator and freon keeping it on longer. My 93 leSabre had the cycling compressor; 98 has V555 which stays on and adjusts the pump amount--unless the low pressure switch would be turning it on and off from an almost low freon charge. which could be this case.

since he had it checked by an air conditioning guy, I'd think the charge would be okay--but...
I am glad you guys are on top of this one, as A/C details are a bit out of my league. I was ASSuming that since he had a '95, that it would have the same compressor as your '93 had (the one that cycles that I have read about) and so, I naturally ASSumed that it might be the airmix door actuator which can lead to no cold air and in fact heat. Keep up the good information, and hopefuly this Texas Olds will be blowing snow out of the vents.
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