Air Conditioning: Notes

The A/C refrigerant system is a clutch cycling orifice tube type. The system components include the following:

• A/C compressor
• A/C clutch assembly
• A/C condenser core
• A/C evaporator core
• A/C suction accumulator
• Connecting refrigerant lines

The refrigeration system operation is controlled by the:

• evaporator core orifice.
• A/C compressor pressure relief valve.
• dual function pressure switch.
• A/C cycling switch.

The refrigerant system incorporates an A/C compressor controlled by the powertrain control module (PCM).

The A/C cycling switch senses the low-side pressure to control A/C compressor operation.

A pressure relief valve is installed in the compressor manifold and tube to protect the refrigerant system against excessively high refrigerant pressures.

The evaporator core orifice is installed in the condenser-to-evaporator line to meter the liquid refrigerant into the A/C evaporator core.