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Old 09-30-2019, 04:36 PM
PDeputy PDeputy is offline
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Join Date: Feb 2003
Location: Houston, TX
Posts: 50
I am agreeing with aqua190's response above about the heater control valve. I just finished "overhauling" the ac on my W123 (compressor, condenser - parallel flow, expansion value, drier) and had what I thought was inappropriate gauge reading ("high pressure" on the low side gauge). Turns out the ac system was working properly, but the monovalve was stuck open and the related heat was "overtaking" the freon cooled air in the evaporator box. When I shut off the hot water flowing through the monovalve, I had ac in the vents at 40 degrees. Just an FYI, its one possible explanation if your AC will not blow cold, but you think it should.
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