I installed a new A.C. compressor and drier on my 99 E320. The ac is now ice cold, but there are times when the compressor will suddenly stop blowing cold air by cuttimg off. I can get it to immediately come back on by pressing the "EC button" and then back off. Thereafter, the compressor will begin blowing cold again. This happpens even the setting is on "low". The fan adjusts correctly to the temperature inside the cabin.

Any ideas what is causing the compressor to cut off but back on immediately by pressing the EC button on/off?

Thanks!

Richard

Not sure about a 99 E320. Earlier cars were supposed to cut out when the evaporator temp gets down to ~32°, but then they are supposed to cycle back on again when it climbs back up to just below 40°. And this is to be tested at low blower speeds.

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John Roncallo

Most systems have shut-off switches for the compressor when the system refrigerant pressure gets either too high or too low. I would start by verifying the system pressures on both the high and low sides.

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Robert Fini

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