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A/C Problems

1429 Views 11 Replies 6 Participants Last post by  kepalo
We had a couple of warmer days and I noticed my A/C was working intermittently. It works at idle, but any rpm up to 2K and it will start cycling on and off every 5-7sec. At 2k it will stay running longer up to 2 min before it cycles as long as the fan is on high and the A/C is set to max. I put my gauge set on it and found the following. The temp was 70 deg. with low humidity and the truck hadn't been run for several hours. All readings were taken with the A/C set to max, the doors closed and the fan on high.

Static Low 87 High 92
Idle Low 35 High 140
On Low 20 High 160 *the compressor cycles on and off every 5 sec
Off Low 40 High 70 *this is the pressure the system returns to before cycling again

If I leave the A/C on max with the fan on high and stay above 2K the compressor will run for 2 min before getting below 20 and cycling off. If I turn the fan down and keep the rpm the same the low press. will drop below 20 quickly and the compressor will start cycling. Any lower rpm and as soon as the compressor kicks in the press drops within a couple of sec below 20. Any help is appreciated
1 - 3 of 12 Posts
Sounds like its low on charge.
Get AC pro from a parts house. They have directions and will tell you how to get it correctly charged. I think they have a ac stop leak ac pro, and a regular one . get the one with stop leak in it so it will help plug the leaks.
The ac pro has a charging gauge on it, it will tell you if you are charged correctly or not.
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