![]() ![]() Incidentally, the AC is turned off if the engine is overheating, or under heavy load (such as when accelerating with the pedal way down) to reduce the AC load on the engine. Was the cabin air filter, and the condensor, checked to see if they might be clogged? What did the mechanic do to come to the conclusion that the "evaporator thermostatic switch" needs to be replaced? Was the level of refrigerant checked with manifold gauges? ![]() Icing of the evaporator can be caused by low refrigerant in the system, or even a blocked cabin air filter that restricts air flow. If the temperature at the evaporator gets down to near freezing, which can cause ice to form on the evaporator that would block the air flow, it turns the AC off until the temperature is high enough to prevent ice build up. Just turning the system on, and observing what it does (or does not do), might not be sufficient to come to a conclusion as to what is wrong.Īs far as I know, the so-called "evaporator thermostatic switch" isn't actually a switch it a temperature sensor on the evaporator that's connected to the engine control module which, in turn, controls the operation of the AC compressor. ![]() I'm no expert when it comes to air conditioning, but I do believe there are some tests that should be performed when diagnosing AC problems such as this.
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