The air conditioning system in the Saturn SC2 is made of several components, including the air compressor, condenser, evaporator, drying or accumulator, orifice tube or expansion valve, and the high- and low-pressure hoses. If the system doesn't cool, you must diagnose all the components -- there could be a leak or one of the components may not be working properly.
Drive the vehicle to a shop certified in air conditioning. Have them hook the gauges up to the system to see if there is Freon in the system. If there is Freon, the problem is in one of the components. If the low-pressure side is high, there is probably a blockage, in which case, the Freon must be evacuated, then the dryer or accumulator and the orifice tube must be replaced. If the system has no Freon, have the shop put Freon into the system.
Turn on the leak detector. Turn the air conditioning on high. Hold the leak detector at the vent in the cab, after making sure that cold air is coming out of the vent. If the leak detector senses Freon, it will make a long tone, which means the evaporator is leaking. Repair the evaporator.
Open the hood. Check the compressor, condenser, dryer or accumulator, and high- and low-pressure lines for leaks. The leak detector will make a long tone if you find a leak. Repair the leaking parts.
