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Old 05-01-2013, 09:58 PM
masonpeterbilt379's Avatar
Thread Starter
Join Date: May 2013
Posts: 1
Default A/C PROBLEMS with my Peterbilt 379

Any suggestions/ or ideas on what the problem is with my a/c with my Peterbilt 379.
In 3 years, I have been through 5 a/c compressors. This last time, I had the a/c compressor replaced, all pressure switches replaced, new belts, hoses, and recharged.
Like the last 3 years, it works great for a month after repair, and then it starts to blow warm. In the past, there used to be a ticking noise when it would start to go out and then the a/c compressor would blow. However since I had the pressure switches replaced, it isn't doing that, but once again its blowing warm air.
Not sure what else to do, but I drive South so having a/c is a must.
I've been to Kenworth dealerships, Peterbilt dealerships and other service stations and nobody can figure it out!
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Old 05-07-2013, 03:17 AM
mike in idaho's Avatar
Join Date: Nov 2010
Location: orofino, idaho
Posts: 35

Time to put some dye in the system and find the leak.
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Old 05-08-2013, 12:05 PM
Musicman's Avatar
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Join Date: Dec 2005
Location: Southern IL
Posts: 790

Originally Posted by mike in idaho View Post
Time to put some dye in the system and find the leak.
Most places add dye as standard operating procedure. At least I know the TA's, my local Cummins shop and the Peterbilt dealers I've used over the years have.
"The Breakfast of Champions isn't cereal, it's the competition!" - "Success is how high you bounce when you hit bottom." - "An appeaser is one who feeds a crocodile, hoping it will eat him last."
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Old 05-08-2013, 08:06 PM
Maniac's Avatar
Senior Board Member
Join Date: Sep 2004
Location: Northeast
Posts: 1,092

Just need to find the leak, it can be frustrating, I would uspect the condensor, it is in front of the radiator, and easy to get hit by something, a tiny pin hole is all it takes, and sometimes it inside the fins.

Either that or one of the lines, you didn't say how old the truck is, my 99 KW has had almost all the lines changed at one time or another.
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Old 04-10-2020, 11:01 AM
CharleeeeD1's Avatar
Join Date: Jan 2020
Posts: 7

I had the same issue some months ago and I tried to repair it by myself but I broke it more. I thought the service costs a fortune and I began to raise money for it. After a month I went to air conditioning servicing and I was waiting for a big check but it cost cheaper than I expected and this surprised me. Now before to repair something, I control if it is expensive to work or not.

Last edited by CharleeeeD1; 04-11-2020 at 10:08 AM.
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