This is by design. under load, the computer will deactivate the air conditioning in order to take the load of the compressor off of the engine, thereby getting more power for required acceleration. the a c light will remain illuminated etc, and after you finish accelerating the air conditioning will resume normal operation.
it is not just the WOT sensor, it is also done through the calculated load PID, and the temp change is close to instant when the engine is under load. at idle, there is no heat transfer happening, therefore the change will be more gradual. the ac will NOT ONLY DEACTIVATE DURING WOT. it is done though calculated load.
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If the computer turns off the compressor simply by releasing the clutch at the pulley, then transition to warm would take much longer. I am familiar with "WOT" function & this problem doesn't need wide open throttle to occur. I can test this by turning off compressor manually. Doing this, it takes about 10 sec. or more to feel the air temp. at vents rise. This problem happens in about 2 sec. As though airflow is suddenly diverted from evaporator core to the heater core thus causing air temp. to rise quickly.
I could understand this on the smaller engines but, I have the 2.3L high output ZTS model. It might be related to the PZEV designation on my car.
Also, test I described earlier was performed at highway speed, not at idle. So even if you stopped flow of freon suddenly, it would still take evaporator core some time to loose it's cool wouldn't it?
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