Air Conditioner Problem - 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 07-10-2004, 12:46 AM   #1
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Default Air Conditioner Problem

Ok here'* the deal. I recently just converted my AC over to R134a freon because I pulled the codes on my computer and I was getting a code 66. Well I changed everything over and my AC works for awhile and then shuts itself off. Do I need to reset my computer by unhooking the battery cable. I just did the diaginois of the AC and am getting a code 166 and 110. The temp sensor is going to be replaced soon as it is about 10 degrees high. But mainly my question is after refilling my AC system do I need to reset the computer to get rid of the code 66 that keeps shutting off my compressor? I drove all the way to work this morning and the thing didn't kick off until almost at work and going home tonite the AC worked just fine.
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Old 07-12-2004, 02:28 AM   #2
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The code 66 means that your compressor is cycling too much, and the computer thinks it is low on R-134a. It may be a little low. However I have always been weary of converting a car with electronic climate control to R-134a because the charge is naturally less (80%).
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Old 07-12-2004, 02:35 AM   #3
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I unhooked my battery and I'm still getting a code 66. Also the climate control diagostic shows that the outside temperature sensor is bad which will be replaced very shortly. Could it cause the compressor to cycle on and off more than necessary. The air blows cold when it does blow but then it kicks off for no apparent reason. It'* 90+ degrees here and I need my AC
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Old 07-12-2004, 02:39 AM   #4
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The code 66 is what turns off the compressor. If you clear it, it will come back if the compressor cycles too much.
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Old 07-12-2004, 05:39 PM   #5
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Looks like Fuddy nailed this one, easier to stay with R12.
Here is a link with more info on converting to 134a if you must.

http://www.ackits.com/forum/messagev...AR_MSGDBTABLE=
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Old 07-12-2004, 11:04 PM   #6
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So basically i'm screwed with my AC unless I want to add some resistors. My AC worked fine today. Didn't kick off once. Oh well I guess I'll just have to live with what I did.
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Old 07-13-2004, 08:52 AM   #7
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sounds like you need more coolent
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Old 07-13-2004, 06:36 PM   #8
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I can't verify whether or not the ECC system will take it - but I would check the vent temperature. Adding more R-134a may solve your problem... But you do not want to overcharge it.
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Old 07-14-2004, 10:21 AM   #9
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you have to check pessure with the compresser running you mite have to jump out the pressure switch and the relay to keep compresser running when you get the correct pressure then erase the codes see if that works
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Old 07-14-2004, 12:37 PM   #10
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i have the same problem i might have to do that
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