Refrigerant Type: R134a
Ambient Temp: 72
Pressure Low: 10
Pressure High: 110
Country of Origin: United States
I am working on a Freighliner. The drier fell apart. Bus came in with similar gauge readings (0-10 psig low and 120psig high) with warm air out vents. Replaced evap., evap. probe, drier, condenser, and expansion valve (twice). Flushed all hoses (twice). Recovered and vacuumed to many times to think of. temperature checked every hose, line, fitting, cond., evap., drier, and compressor. No smoking gun on the blockage. The evap. was icing due to the lack of a drain tube (freightliner didn't install one - engine heat had direct line to evap. probe). Tested evap. probe, and expansion valve(s). My current readings with fan engaged 10 psig low and 110 psig high ambient 72 f . Fan on auto, both climb respectfully to each other until high hits 325 psig, low at 35 psig, fan turns on and brings pressures back down only for them to start climbing. There is no frost to be found nor cold lines. Evaporator exhaust side bottoming at 48 f. I am out of logical idea's. Any ideas ??
title should have been "near vacuum"
Problem solved. Turned out to be high side hose falling apart under pressure. Odd there wasn't a temp. differential at blockage.
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