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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 05-31-2007, 02:07 AM   #1
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i know there have been several a/c questions over the last month with the weather getting warmer. I have replaced my entire system new compressor, new evap, new orifice tube. put the recommend amount of oil in the compressor before the install, all this done to convert to 134, i went to put the 134 in the system and i can't get the compressor to kick in and draw the 134 through the system. the only code i get is that stupid actuator door one but that wouldn't keep the a/c compressor from coming on just the cold from getting into the car, I should be putting almost 2.5 cans in the system, but after about 1/4 of a can the pressure is at the level it should be. but i can't get the compressor to come on so any suggestions of something i am overlooking would be appreciated.
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Old 05-31-2007, 04:41 PM   #2
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You could try pumping the system down with a vacuum pump for 30-45 minutes. That will get rid of most of the moisture in the system. Then, with the system still holding vacuum, charge the first can of R-134a. You can do this without the engine running and with the can upside down to charge it quickly as a liquid. After the first can is charged, the system pressure should be high enough that the compressor will come on when you start it up, allowing you to charge the rest. Charge the rest with the can upright - it is slower, but safer that way. I am not sure, but, if your system is like most, there is a low pressure switch that will not allow the compressor to come on when there is insufficient refrigerant (pressure) in the system.
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Old 06-28-2007, 04:01 AM   #3
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Quote:
Originally Posted by bill buttermore
You could try pumping the system down with a vacuum pump for 30-45 minutes. That will get rid of most of the moisture in the system. Then, with the system still holding vacuum, charge the first can of R-134a. You can do this without the engine running and with the can upside down to charge it quickly as a liquid. After the first can is charged, the system pressure should be high enough that the compressor will come on when you start it up, allowing you to charge the rest. Charge the rest with the can upright - it is slower, but safer that way. I am not sure, but, if your system is like most, there is a low pressure switch that will not allow the compressor to come on when there is insufficient refrigerant (pressure) in the system.
i decided to take the car to a shop as suggested, they vacuumed the system and put in the correct amount of 134 everything was taken apart and cleaned. I cleared all the codes then turned it on. I still have no power to the compressor. my previous post i was asking if the common air dam problem would keep the ac compressor from engaging. I don't think this would create that problem, but i don't know. it'* very confusing to have everything new and correct and it still not work. I don't know where else to check. any suggestions. Just to mention it. my vents all seem to operate in the correct order. i removed the glove box to observe the air dam and it was moving, not perfectly but still moving. checked all the fuses and even jumped the relay under the hood. the compressor did engage when i did that. replaced that relay still nothing.
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Old 06-28-2007, 11:48 AM   #4
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I am confused as to how a shop put in the correct amount without the compressor running? I always thought you had to have the system running in order to pull the freon in and charge it up? I would look at the high pressure switch. If there is enough pressure in the system and the compressor does not kick in then it is most likely the high pressure switch. I am not sure where it is located on our cars though as I have not dealt too much with the AC yet.
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Old 06-28-2007, 11:59 AM   #5
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i think i mentioned that i had jumped the relay, i got that information for them. The guys at the ac shop jumped the relay to get the stuff in the system. I just did it so i could see it run for myself. They were willing to look for the problem for me, for a fee of about $120 an hour. so i thought i would bring it home and look through the simple stuff first and get some feedback from you guys. And not to mention read countless post about ac problems.
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