Workshop Repair and Service Manuals GMC SIERRA
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Air Conditioning Cycling Switch Replacement (Non-HP2)

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Special Tools

J-39400-A Halogen Leak Detector

Removal ProcedureDisconnect the electrical connector from the A/C low pressure switch.

Air Conditioning Cycling Switch Replacement (Non-HP2)

Remove the A/C low pressure switch from the accumulator.Remove the O-ring and discard.Installation ProcedureInstall the new O-ring seal to the switch. Refer toAir Conditioning O-Ring Seal Replacement.

Air Conditioning Cycling Switch Replacement (Non-HP2)

Caution:Refer toFastener Caution.

Install the A/C low pressure switch to the accumulator and tighten to 6-Y (53-lb-in).Connect the electrical connector to the A/C low pressure switch.Leak test the fittings of the components using theJ-39400-A halogen leak detector.
Air Conditioning O-Ring Seal Replacement     Removal Procedure Disassemble the A/C refrigerant components. Refer to theappropriate repair procedureFor compression style fittings use a back up wrench on thefitting (2) and loosen the fitting nut (1).For banjo style...
Defroster Door Replacement     Removal Procedure Remove the HVAC module. Refer toAir Conditioning and Heater Module Assembly Removal and Installation.If equipped remove the heat stakes-(1) from theHVAC module-(2) with a screwdriver and a hammer. If...
Heating and Air Conditioning System Description and Operation (HP2)     Engine Coolant Engine coolant is the essential element of the heatingsystem. The thermostat controls the normal engine operating coolanttemperature. The thermostat also creates a restriction for thecooling system that promotes...
Air Conditioning Refrigerant Service Valve Core Replacement     Air Conditioning Refrigerant Service Valve Core Replacement Callout Component Name Preliminary ProcedureRemove the service port cap.Recover the refrigerant. Refer toRefrigerant Recovery and Recharging. 1 Air...
Compressor Clutch Plate Hub Assembly Replacement Compressor Compressor Clutch     Compressor Clutch Plate/Hub Assembly Replacement Callout Component Name Preliminary ProcedureRemove the air conditioning compressor belt. Refer toAir Conditioning Compressor Belt Replacement.Remove the air...
Suction Hose Replacement (LZ1 L20 LC9 L9H L92)     Suction Hose Replacement Callout Component Name Preliminary Procedure Recover the refrigerant. Refer toRefrigerant Recovery and Recharging. 1 Suction Hose Bolt Caution:Refer toFastener Caution. Tighten...