Question about 2002 Mercury Grand Marquis
If you have ice accumulating on the evaporator, there should be no air blowing out the registers because the air will be stopped at the evaporator.
If this is happening, the a/c is not cycling on and off as often as it should. At 70 degrees F, it should cycle on and off about 4 times/minute. Less when hotter.
If not cycling off at all, replace the screw-in pressure switch on top of the accumulator under the hood near the fire wall on passenger side.
report results of test.
The A/C cycling switch is mounted on a Schrader valve-type fitting on the suction accumulator/driver.
Posted on Jul 30, 2009
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Posted on Jan 02, 2017
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