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Two items besides the compressor thermal protection Posted by Gene N [Email] ![]() ![]() ![]() In Reply to: "break protection" of ACC??, David L, Wed, 29 May 2002 03:06:07 Members do not see ads below this line. - Help Keep This Site Online - Signup |
First off, not all of the compressors have an overheat switch. I know my Sanden doesn't. The other two places that can turn off the compressor are the pressure switch (on the receiver/drier on my year, maybe somewhere else on the 1993's) and the evaporator temperature sensor. The pressure switch will cut off the compressor if high side pressure gets too high (I don't know the pressure, but let's say 300 psi) and the temperature sensor will cut off the compressor if the evaporator freezes up. The pressure switch will trigger if the system is working too hard, specifically if the condenser is not removing the heat fast enough. Hot day, high humidity, stopped in traffic, blocked condenser, fan problems--a combination of these things could cause the problem. If the evaporator freezes up, it can be caused by not enough freon, a bad expansion valve, blocked drains, and possibly other things like a clogged evaporator.
All that said, you'll need to get the system checked to diagnose the problem. It would be especially good if you could have the system pressures checked when the car is exhibiting the problem, but that might be hard to coordinate.
posted by 140.188.64...
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