If your AC isn't working, the problem is likely one of the following:
* Low refrigerant: This is the most common cause. You need to have a qualified technician recharge the system with the correct refrigerant (R-134a for most 1992 vehicles, but check your vehicle's documentation to be certain). They will also check for leaks.
* Compressor failure: A failing compressor is a serious issue. It often makes noise, may not engage, or may be seized. Replacement is the only solution.
* Other component failures: There are many other parts in the AC system that can fail, such as the condenser, evaporator, expansion valve, or pressure switch. A professional AC technician needs to diagnose the problem.
Never attempt to work on your car's AC system without the proper training and equipment. Refrigerant is under high pressure and can cause serious injury if handled improperly. Take your Grand Marquis to a qualified automotive air conditioning technician for diagnosis and repair.
