REMOVAL & INSTALLATION
An receiver-dehydrator is used on most early air conditioning systems which were installed on Chevrolet mid-sized vehicles by the factory or dealer. The receiver-dehydrator is a metal cylinder normally found at the outlet of the condenser. It serves as a storage space for liquid refrigerant (thus ensuring a steady flow to the evaporator) and as a moisture eliminator for the system. These units have a great thirst for moisture and should ALWAYS be sealed to the atmosphere. Removal or installation should take place as quickly as possible in order to minimize exposure of the unit to the atmosphere. An expansion valve was used on these vehicles until the mid-1970's when an Accumulator/Drier took the receiver's place.
- Properly discharge and recover the refrigerant in the A/C system using a suitable recovery station.
- Disconnect the negative battery cable. On some early models, such as the 1968 Chevelle, it may be necessary to completely remove the battery for access.
- Disconnect the inlet and outlet lines from the unit. Immediately cover all openings to prevent system contamination.
- Remove the bracket attaching screws, then remove the receiver-dehydrator assembly from the vehicle.
- Add 1 oz. of fresh refrigerant oil to the new receiver-dehydrator unit, then position the unit in the vehicle.
- Install the bracket retaining screws to secure the unit in position.
- Lubricate new O-rings with fresh refrigerant oil, then remove the plugs and quickly connect both the inlet and outlet lines.
- Connect the negative battery cable.
- After checking that all the refrigerant lines are properly tightened, evacuate, leak test and charge the system.