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Originally Posted by Jim Sutton
But also from my reading I found that the climate control system does monitor the temperature of the evaporator, so the controller could cycle the compressor to control the temperature of the evaporator.
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That is technically correct, but unless you are using the a/c in the winter, the chances of freezing the evaporator with R-134a installed in a R-12 system are just about nil.
I have R-12 installed in a '82 300D. The evaporator cut-out switch operates only on very rare occasion, like when the a/c is turned on but not really required.
Quote:
Originally Posted by Jim Sutton
In any case mine does not appear to cycle and I an trying to determine if that is normal.
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It's tough to say what is normal without having the details about the vehicle in question. But, if it was originally a R-12 system, it likely doesn't have a high pressure cut-off switch. Most R-134a systems (as original equipment) have a binary pressure switch, which cuts out the compressor clutch if the pressure is too low or too high.