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Old 12-30-2012, 09:00 PM   #1
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Join Date: Sep 2010
Location: Foster City CA
Posts: 1,095
A/C Expansion Value Question

My A/C system is fully charged and it cools exactly as it should. So hear is my question.

My A/C expansion valve operates to reduce the pressure differences between the high and low sides when the radiator fans turn on at high speed. I can hear this take when I open the front hood and listen.

I've heard the car's computer turns off the A/C compressor during high speed fan operations to keep the engine temperature from increasing as fast as it would with the A/C operating. If this is true, I am guessing that it also triggers the high pressure switch to equalize the system pressures through the expansion valve.

I look forward to your thoughts on this.


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