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2500HD/3500 HD Trucks & Drivetrain Discussion Forum for the 2001 & newer 2500HD/3500 Trucks, Transmissions & Drivetrain

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Old 08-20-2006, 06:17 AM
tlowen tlowen is offline
Join Date: Aug 2006
Posts: 1
Default 2003 HD2500 Duramax AC

For about a year now, I have had an intermittant problem with my ac. Every now and again, it will stop cooling. The fan still blows but the compressor stops even though its being called on to cool. After a while, it comes back on. It has not been so much a nuisance in the past but recently its beginning to stop more frequently and for longer periods.

Has anyone experience this? Is there a known issue or defective componenet? I have replaced one pressure switch on the freon tank but it didn't help.
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Old 08-20-2006, 12:06 PM
DmaxMaverick's Avatar
DmaxMaverick DmaxMaverick is offline
Join Date: Apr 2001
Location: CA
Posts: 11,837

Could be over or under charged. Either can/will cause the cut-out. If overcharged, a higher outside temp will cause an overpressure condition. If it's been working fine for a long time under the same conditions, I'd suspect an undercharge. The system will weaken over time, making it more sensitive to a low charge.

It may have developed a leak somewhere, also.
1985 Blazer 6.2
2001 GMC 2500HD D/A
2014 Chevy Cruze Diesel - Fabulous car, no problems at all, but sold Nov. 2016 @ 55K miles.
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