Quote:
Originally Posted by phutyle
My research indicates that too much gas causes the pressure to get too high for the refrigerant to boil, meaning that cold air can’t actually be produced. But I’m not an aircon expert. Just like my very own post, almost everything you read about car aircon on the interwebs seems to be half informed conjecture.
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Yes, generally overcharging will reduce cooling performance & can trigger the high pressure switch, stopping the compressor. Being short of gas generally lowers the temperature of the evaporator, causing partial frosting of the evaporator & the return line to the compressor. However there is usually a low temperature sensor which should stop the compressor before it gets too low in temperature. Again, cooling performance is reduced & if the gas charge is low enough it will trigger the low pressure switch, again stopping the compressor. The aim is to ideally have the evaporator at a couple of degrees above zero for optimum cooling performance.