190E Weird Air Conditioner Behavior
My 109E A/C behaves very strangely. It intermittently switches the compressor off and blows ambient air, then sometime later reverts to normal operation.
Please note that this is NOT due to low refrigerant or faulty pressure switch - the system has just been recharged and the switch replaced (though I now suspect it was innocent!). Also, bypassing the pressure switch has no effect when the problem is happening.
Obviously there is something else in the compressor relay circuit that is intermittent. I guess it must be the evaporator temp sensor, that is switching off and failing to switch on again when it should. Has anyone had any experience like this?