Quote:
Originally Posted by LarryBible
The aux fan will not play into this issue. It is there to bring down excessive high side pressure which is obviously not a problem when it is not cooling well in traffic. If it is an air flow problem leading to this issue, then check the engine driven fan clutch.
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Really? That's what that fan is for - the condenser on the A/C system; you know, for when you're car is idling or stuck in traffic. In fact, on most vehicles it is indeed called the "condenser fan".
Excessive high side pressure "obviously" IS a problem if the vehicle does not cool well in traffic or idling, because if the coolant temperature is OK, the fan clutch is obviously working - and since it's controlled by engine temp ONLY, it will not pull enough air to cool both the coolant and the refrigerant.
Since the car does not overheat in traffic and the A/C works while moving, then it probably isn't an air flow/obstruction problem or a fan clutch related issue. It's a low-speed/no-speed idling air-flow issue that a bad condenser fan would absolutely cause.
Excessive high side pressure trips the high side cut-out, killing power to the compressor at low/no speeds; no compressor, no cooling. This is A/C 101.
Just google "the refrigerant cycle".
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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608
Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.
