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55 -60 degrees Semi Truck

extramile on Wed July 29, 2009 7:27 PM User is offline

Year: 2003
Make: Peterbilt
Model: 379
Refrigerant Type: 134A
Country of Origin: Canada

Here we go again fellas.
Did I 2003 highway truck last weekend and owner called today and said it's 55-60 at vents. Last weekend we put on new compressor, new condenser, new orfice tube and new accumulator. Added proper amount of oil, checked for leaks and vacuumed. Let the vacuum sit on extra long because system was left open but he had lines wrapped tight so other then moisture lines were clean. There was no black death he had a leak in condenser and then never fixed it so he just decided to put everything on new.
I put full charge to system (5.5lbs as per mfg) and pressures were perfect, low around 35, high would get up to 300 fan clutch would kick in and take it down to about 165. This is exactly on spec for this truck. Air at vents at time of charge was 52 sitting still and heater taps closed. Thought it should be better. Lots of water coming from evaporator so I figured system is working good. Now with him saying it's up a bit I'm wondering and so is he if the evaporator is dirty. He said it has never been cleaned and I'm thinking that's were I'm losing some cooling capacity. Everything else is normal, line temp going in and out of evap are exactly on spec. I can't really think of anything else it would be and I have seen this problem before. Am I missing something ????

chris142 on Wed July 29, 2009 8:57 PM User is offline

Meke sure that the heater hoses are not getting hot water in them

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