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PARTS
VIEW SOLUTIONS TO COMMON PROBLEMS
PARTS

Refrigerants The Environment & The Law
The Compressor
The Compressor Clutch
The Condenser
Accumulator / Reciever Drier
Expansion Devices
The Evaporator
System Switches
SOLUTIONS
Select a part to view solution for common problems associated with the item.
Advice: Before the AC system can be opened, the old refrigerant must be drawn out by certified professionals using specialized equipment. Check with your repair shop for prices on evacuating the old refrigerant before you make the repairs and then drawing the system down to a vacuum and refilling with refrigerant after your repairs have been made.
Operation: The compressor is responsible for drawing the hot vaporized refrigerant from the evaporator on the low pressure side of the system, pressurizing the refrigerant further increasing it's temperature and then delivering the refrigerant into the high pressure side of the system. Advice: Before the compressor can be removed, the old refrigerant must be drawn out by certified professionals using specialized equipment. Check with your repair shop for prices on evacuating the old refrigerant before you make the repairs and then drawing the system down to a vacuum and refilling with refrigerant after your repairs have been made. Different systems use different oils. Make sure that the oil in the new compressor (if it comes with oil) is compatible with your system.
Operation: The compressor clutch is responsible for physically making the connection between the pulley being driven by the AC belt and the driveshaft of the compressor. Energizing the magnetic clutch causes the rotating pulley to engage with the driveshaft on the compressor forcing the compressor to rotate. The AC system uses the clutch to cycle the compressor on and off. Advice: Some compressor clutches can be changed without losing any refrigerant. In most cases special tools will be needed. Check the repair guides for the vehicle that you are working on. Check the Loan-A-Tool section for availability of any special tools required. If removing the clutch involves the venting of refrigerant, the old refrigerant must be drawn out by certified professionals using specialized equipment. Check with your repair shop for prices on evacuating the old refrigerant before you make the repairs and then drawing the system down to a vacuum and refilling with refrigerant after your repairs have been made. Recommendations: Repair guides Loan-A-Tools
Operation: The condenser is responsible for transferring the heat that was absorbed in the evaporator to the cool air passing over the condensers fins. Advice: Before the condenser can be removed, the old refrigerant must be drawn out by certified professionals using specialized equipment. Check with your repair shop for prices on evacuating the old refrigerant before you make the repairs and then drawing the system down to a vacuum and refilling with refrigerant after your repairs have been made.
Operation: Although they are built on two different designs, the accumulator and the receiver drier are both responsible for similar tasks. They both contain a desiccant for removing moisture from the system and they both act as a reservoir for extra system capacity. The differences are that the receiver drier is used on systems that have a thermostatic expansion valve, and it is mounted on the high pressure side of the system before the evaporator. It ensures that liquid refrigerant is supplied to the evaporator by pulling refrigerant from the bottom of the device. The accumulator is used on systems that have a fixed orifice and is mounted on the low pressure side of the system after the evaporator. It ensures that the compressor is fed only refrigerant vapors by separating the liquid from the vapors then pulling the vapors off of the top of the device. Advice: Before the accumulator or receiver drier can be removed, the old refrigerant must be drawn out by certified professionals using specialized equipment. Check with your repair shop for prices on evacuating the old refrigerant before you make the repairs and then drawing the system down to a vacuum and refilling with refrigerant after your repairs have been made. Anytime that the system is opened for any reason the accumulator or receiver drier should be replaced. The reason for this is because the desiccant inside that is supposed to absorb the moisture in the system will become saturated with moisture from the air in a very short period of time. Once the desiccant is saturated it is useless. Moisture in the system will not be absorbed and will corrode the inside of the system.
Operation: The expansion device, whether it is thermostatically controlled or a fixed orifice type is where the cold magic takes place. When the pressurized refrigerant trickles into the evaporator through the small hole in the expansion device it expands rapidly turning into a cold vapor cooling the fins of the evaporator where the air passing over them from the blower motor becomes cool before being directed into the passenger cabin. Advice: Before the expansion device can be removed, the old refrigerant must be drawn out by certified professionals using specialized equipment. Check with your repair shop for prices on evacuating the old refrigerant before you make the repairs and then drawing the system down to a vacuum and refilling with refrigerant after your repairs have been made. A restricted expansion device is an indication of trouble elsewhere in the system. Where did the debris that is causing the restriction come from. Sometimes the desiccant bag will rupture sending desiccant particles throughout the system. Other times metal particles can come from a failing compressor.
Operation: The evaporator is responsible for supplying the area for the refrigerant to expand and turn cold. Advice: Before the evaporator can be removed, the old refrigerant must be drawn out by certified professionals using specialized equipment. Check with your repair shop for prices on evacuating the old refrigerant before you make the repairs and then drawing the system down to a vacuum and refilling with refrigerant after your repairs have been made. Because of it's location under the dash replacing the evaporator is probably one of the more difficult AC system jobs. Check the repair guides for the vehicle that you are working on for the proper replacement procedures. Recommendations: Repair guides
Advice: There are several different switches that are used in AC systems. Different systems use different switch combinations to accomplish various tasks such as the wide open throttle cut-off switch which disables the compressor during heavy throttle acceleration. Check the repair guides for the vehicle that you are working on to see which switches are being used on that vehicle. Recommendations: Repair guides
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