1999 Suburban air cond intermitent problem


Old 06-18-11, 05:48 PM
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Join Date: Jun 2011
Location: USA
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Post 1999 Suburban air cond intermitent problem

A friend said his ac was not cooling well and asked if I would add some refrigerant . When I tested it the system was perfect. The next day it quit again and the compressor clutch was not engaging. I plan to look into it in the next couple of days. I'm not sure if the computer plays a big role in the ac operation like the later model vehicles. Is there a common problem that occurs on these or a common place to start looking. Any advice will be apprieciated.
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Old 06-22-11, 08:41 AM
billys68ss's Avatar
Join Date: May 2003
Location: USA
Posts: 1,459
Cycling switches and A/C request are all controlled by the PCM. Here is the wiring diagram.

Hope this helps ya,

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