Expansion Block/Orifice Tube: Service and Repair

Fig. 2 Spring lock coupling disconnect & connect:

1. Discharge refrigerant from system.
2. Disconnect and cap liquid line from evaporator core inlet tube, Fig. 2.
3. Pour a small amount of refrigerant oil into inlet tube to lubricate orifice tube O-rings and inlet tube.

Fig. 5 Fixed orifice tube:

4. Using tool T83L-19990-A or equivalent, engage with the two tangs on the orifice tube, Fig. 5. Do not twist or rotate the fixed orifice tube in the evaporator core inlet tube, as it may break off.
5. Hold T-handle of removal tool to prevent it from turning, and run nut down against evaporator core tube until orifice tube is pulled from inlet tube.
6. Reverse procedure to install. Use new O-rings lubricated with refrigerant oil.
7. Leak test, evacuate and charge system.