I have a megane II 1.5 DCI Oasis, and so far its been okay. When I bought it 6 months ago the Air Con was working okay. I have been using it on and off and just lately with the sun coming out I have needed it to cool the car down inside. But on this occasion I switched it on but no click from the compressor and now increase in revs. This was apparent on all blower settings. I drove it to my destination and tried it again and the compressor clicked and there was an increase in revs. Over the next couple of days I tried it and found that first thing in the morning it would not work when it was cold and when the engine had warmed up and it was warmish outside the compressor would kick in. I spoke to an air con man and he said that the gas was probably low and the pressure switch was kicking in and out inhibiting the compressor (Boyles law- temp increase, pressure increases). Well I took it to the air con man and he leaked checked it fine, it was low on gas and refilled it and did all the vent tests okay. I picked it up yesterday all fine. When I drove it to work I thought I would give a blast on cold but when I switch on the air con no compressor kick in. I switched off the engine and back on again and tried it , it worked. It was cold outside 6 degrees and I am wondering if there is any temp sensor that controls the air con. I say this because the owners manual says that air con will not work if it is cold outside. My Megane is just a manual air con system but I do not know what other sensors are controlling the air con apart from the tri function pressure switch ( low gas sensing/over pressure). Any ideas?
