| Re: [GMCnet] A/C head pressure [message #324951 is a reply to message #324943] |
Sat, 14 October 2017 19:41   |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma:
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I seldom look at high side pressure on R-134 systems. There are too many variables for an accurate diagnosis in my opinion.
I got burned once by not looking at the high side presssure. My Colorado would start cycling more that normal when the outside temp went over 90 to 95. I eventually, after many trial and errors and several months, found that there was too much r-134 in the system and that the high side trigger point for the computer was 417 PSI. Removing just a Little R-134 took care of the problem. In the last 10 years on that same vehicle I have looked at the high side a couple of times and on a hot day pressure in the middle 300's appears to be normal.
I do not know if that helped or not.
Ken B.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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