P30 Chassis Dash Air Problems
Background: 1996 Winnebago Adventurer, P30 Chassis w/7.4L engine and SCS/ Frigette air conditioner. I've owned since 2009 and AC refrigerant has always had small leak. Before each trip I'd add one or two cans 134A refrigerant and bring pressures up to spec and AC worked fine for the trip. Usually took about a week before enough refrigerant leaked and AC wouldn't work. Also, plenum on firewall around Evaporator and heater core was cracked and pieces missing so temp fixed that with duct tape. Last week before a trip, I added refrigerant brought up to correct pressures, but it wouldn't blow cold air, only cool air. Never had that issue after charging. I decided to purchase plenum and find leak, repair and forever be happy. Cost of new plenum too expensive (more than 10% of the value of the whole rig), so I decided to remove and repair the plenum (repair went great and looks good). Determined refrigerant leak was at compressor, so bought new compressor, dryer, expansion block (THX), and AC flush. After removing compressor dryer and thx, I flushed both Evaporator and Condenser, put everything back together and pulled vacuum. Let vacuum sit appropriate amount of time to be sure leak was not present. Charged system. But still won't blow cold air??? Air in duct only down to 60 degrees.
So, AC experts please chime in!! What am I missing? Why won't it cool??
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