Receiver Drier Replacement During Air Conditioning Repair & Service (IB00-12-S002)

REPLACEMENT OF THE RECEIVER DRIER DURING AIR CONDITIONING REPAIR AND SERVICE

TECHNICAL SERVICE BULLETIN

Affected Vehicles

All Isuzu vehicles

Service Information

In the past, it has been common repair procedure to replace the receiver drier whenever the system is opened. Further testing has confirmed that replacement of the receiver drier is not necessary unless the receiver drier has been left open exposed to the atmosphere for several hours or found to be defective. A defective receiver drier is one that is:

• Leaking
• Restricted

In addition, there are two other conditions when a receiver drier should be replaced even though it is not the cause of the failure. The Receiver Drier should be replaced when either or both of the following two conditions exists:

• When the refrigerant oil contains metallic particles
• When the Air Conditioning Compressor is seized.

Special Service Note: In order to maximize the life of the A/C System and maintain maximum performance, the following precautions should be performed:

• Anytime an Air Conditioning component is disconnected for servicing, the opening should be capped until the repair is to be completed.
• If a new Receiver Drier is installed during a repair, it should be the last component installed.
• The system should be properly evacuated and recharged. The evacuation should achieve a maximum vacuum for at least 30 minutes to boil out all the moisture out of the system.

It is imperative to remember that the receiver drier has three distinct tasks, they are:

• To provide a reservoir to enable a consistent flow of liquid refrigerant and refrigerant oil to the rest of the Air Conditioning system when correctly charged.
• To provide filtration and straining of unwanted particles within the system.
• To remove unwanted moisture from the system using desiccant material contained in the Receiver Drier.