Apr 19, 2009 · The air conditioning compressor has a low pressure switch to protect it from working when the air conditioning pressure drops bellow a certain point. If the system looses pressure the system has a leak and it must be located and repaired prior to just replacing the R134 refrigerant. Air conditioning work is expensive.
Jun 16, 2018 · That depends on the car. Small cars typically have stacked AC and engine radiators cooled by a single fan. In that case, it makes sense to keep the fan on while the AC is running because the AC thermostat operates by manipulating compressor clutch...