How to Recharge Air Conditioning

Air Conditioning Blows Hot ??

Any automotive air conditioning system employs four basic parts-a mechanical compressor, driven by the vehicle's engine; an expansion valve, which is a restriction the compressor pumps against; and two heat exchangers, the evaporator and the condenser. In addition, there is the refrigerant that flows through this system. If the system is low on the refrigerant ( R134a for automotive use) than the system will blow hot air. In most cases the vehicles system can be recharged. Check for leaks before recharging.

Air Conditioner blows warm air

Air conditioner system is discharged. Have the system evacuated, charged and leak tested by an MVAC certified technician, utilizing approved recovery/recycling equipment. Repair as necessary.
Air conditioner compressor clutch not engaging. Check compressor clutch wiring, electrical connections and compressor clutch, and repair or replace as necessary.

No air coming from air conditioning vents

Check the air conditioner fuse and replace as necessary.
Air conditioner system discharged. Have the system evacuated, charged and leak tested by an MVAC certified technician, utilizing approved recovery/recycling equipment. Repair as necessary.
Air conditioner low pressure switch defective. Replace switch.
Air conditioner fan resistor pack defective. Replace resistor pack.
Loose connection, broken wiring or defective air conditioner relay in air conditioning electrical circuit. Repair wiring or replace relay as necessary.

Featured Reference Link : http://www.freeautomechanic.com/airconditioning.html