GM 13587697
Pressure Relief Valve

Starting the replacement of the a/c refrigerant pressure sensor requires users to disconnect its electrical connector first. Disconnect the a/c refrigerant pressure sensor while removing its seal and throw away the seal. Mineral base 525 viscosity refrigerant oil should coat a new seal before using it to install on the a/c refrigerant pressure sensor fitting. After installing the a/c refrigerant pressure sensor you must tighten it to 6 n.m (53 lb in). To finish reinstall the electrical connection at the a/c refrigerant pressure sensor.

The first step to replace the Air Conditioning (A/C) Refrigerant Low Temperature Sensor requires removal of the left side insulator/closeout panel. To replace the Air Conditioning (A/C) Refrigerant Low Temperature Sensor start by removing any present communications interface module if the vehicle has OnStar(R). First disconnect the temperature sensor cable then turn the temperature sensor one quarter turn counterclockwise to free it from the evaporator case assembly before removal. Push the new temperature sensor into the evaporator case assembly before twisting it one quarter turn to lock into position. Reinstall the temperature sensor connector before reinstalling the communications interface module if removed and then install the left side insulator/closeout panel.

Start the replacement process of the Air Conditioning (A/C) Refrigerant Low Temperature Sensor by removing the left side insulator/closeout panel. Remove the communications interface module from your vehicle when it has OnStar(R) installed. Disconnect the temperature sensor connector from its connection point before you twist the temperature sensor one quarter turn to unhook it from the evaporator case assembly. Finally remove the temperature sensor. Install the new temperature sensor into the evaporator case assembly then turn it one quarter turn for complete installation. The temperature sensor needs reconnection to its sensor after which reinstall the removed communications interface module followed by installation of the left side insulator/closeout panel.

You must disconnect electrical power to the a/c low pressure switch as your first step before replacement. Dismantle the a/c low pressure switch from the accumulator then discard its o-ring seal that connects to the a/c low pressure switch port situated on the accumulator. Attach the a/c low pressure switch to the accumulator while keeping the torque at 4.8 n.m (42 lb in). Reconnect the a/c low pressure switch electrical connector before doing a leak test with the halogen leak detector (J 39400-A) on all component fittings.

Use the Halogen Leak Detector (J39400-A) to leak test the fittings of the components after completing the installation.

Place the new temperature sensor into the evaporator case assembly and twist it one quarter turn to secure it.

Attach the A/C low pressure switch to the accumulator, tightening it to 4.8 N.m (42 lb in).