![]() ![]() because i have power to the relay control side i'm guessing the cabin controller is working and the ecu may have a bad internal or internal ground circuit. i have 12 volts at one side of the relay so i must have power from the cabin controls, but i can't confirm ground as i do not know how to find the ecu if i find the ecu i can run a wire from the ground terminal on the relay and touch terminal 17 on the ecu providing you agree that is the spot on the ecu i need to go for. according to this diagram it gets the power from the mode control to the evaporation thermo switch and then goes thru the pressure freon switch and on to the a/c relay, then thru the relay and on to the ecu. Ok i have the issue of the a/c pump not turning on. I don't think the symptom, as described, can be diagnosed down to exactly what part is bad there's not enough information.ĭo some searching and reading here many AC discussions are about on/off cycling and the possible causes. So sometimes the cause of the AC cycling isn't the AC itself. 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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