Wanting to know if anyone has had the same issue or has any insight on the air conditioner blowing half has cool without a load then when the trucks loaded down... the cab turns into a sweat box! I cant have this down here in Florida!! Any ideas on what might be the issue?
Thanks!
2003 Peterbilt 387 A/C issue...
Discussion in 'Peterbilt Forum' started by JohnFamilyFarms, Aug 28, 2013.
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could be an insulation problem does the floor of the cab next to the shifter gets hot?In that case inspect the exhaust pipe starting from the turbo all the way back to the end of the cab.You may have a hole leaking hot smoke there.
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That would affect the A/C not blowing as strong and as cold?
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I have an 06 Pete and had issues with the AC working.... but not like it should be. It became increasingly noticible as the weather got really hot, it just couldn't keep the cab below 80f. It turned out to be all the hoses were disentegrating from the inside and sludging up the system. From what you describe it may be the same problem- especially if you've ruled out the basics. I had all new hoses made (it was cheaper than buying them pre fab) and installed. Every hose, it was not cheap, and Peterbilt did all the work, but they were also the only ones that figured it out. Hope this helps!
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What is the temp coming out of the vents? MY 387 is 55* on a 90* day.
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have you made sure the system is fully charged?
JohnFamilyFarms Thanks this. -
I have not. I'm actually having someone check it today.
truckon Thanks this. -
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John Family Farms... I know this is an old thread, but that happened to one of our 379's. It turned out to be a clogged orifice tube at the front cab Evaporator. 9First, recover all 9 refrigerant in the system. Second, Undo both high and low pressure lines of evaporator at firewall. Third , remove the orifice tube located just inside the high pressure line going into evaporator and replace with a new one of the same color ( but flush the evaporator if you can before reinstalling the new orifice tube. I found that even if I did vacuum the system, the AC would not work correctly because one side is plugged up with trash and not letting the refrigerant cycle correctly.
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