07 Pete 379

Has anyone stuck gauges on the system before or after the charges? It may already have enough 134a, but there may be a switch acting up or the clutch could be bad. There are many things that can go wrong with a AC system and it is very hard to diagnose unless you can lay hands on it. On a safety note...I wouldn't try to charge it anymore until you can get a set of guages on it and see what the actual pressure(s) are.

 

You might have too much R134 in the system at this point. I agree with Pullingtrucker on checking the system pressure before going any further.

Friend's Freightshaker had A/C problem after replacing a leaky hose and vacuuming/recharging. Turned out, it was way over-charged that the pressure built up to 450 psi as soon as the clutch kicked in, and the excessive pressure cut off the clutch a moment later. Bleeding off some gas solved that particular problem.

 

could be a restriction somewhere, expansion valve in bunk, orifice tube for cab, or blockage in condensor. has there been any recent work or parts changed?

 

Could be a plugged up a/c condenser...

 

Regardless of the brand, the principles of refrigeration are the same... my Pete has Freightshaker drier and compressor part numbers because they interchange.... just don't spread that around!

 

I recently had the same problem. I had too much freon and it blew out my compressor. The orifice tube was clogged and then after all that was fixed the expansion valves went out... Gotta check all the above, Like stated in above posts

 

also, the lo press switchs were bad on the petes about going out.

 

i have 07 379 w06 isx 565 sitting in barn 42k orig mi blowing hot when in 90s shot 3 # into it cold again think seal under clutch is leaking has oil on it but its been sitting over 2 yrs mabee a seal issue w 07s