Wiring Diagram Cluster
1990 Pontiac Grand Prix A/C & Heater Wiring Diagram
Find A/C compressor clutch wiring, blower motor circuits, temperature control module paths, and refrigerant pressure switch schematics.
Matched Diagrams
48
Variant Used
Grand Prix L4-138 2.3L DOHC QUAD 4
Total Vehicle Diagrams
623
From Diagram To Fix
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Open the exact diagram, then move directly into the vehicle hub, the repair most likely tied to this system, or the code cluster that usually shows up with it.
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Vehicle Repair Hub
Step out of raw diagrams and into the full 1990 Pontiac Grand Prix hub with repairs, specs, codes, and other systems already tied to this car.
View vehicle repair hub →OEM source
Factory Manual Evidence
When there is no clean repair shortcut for this system, drop into the OEM manual sections that usually carry the authoritative test path.
1990 Pontiac Grand Prix A L L Diagnostic Trouble Codes ( DTC ) →Stay in wiring
More System Pages for This Vehicle
Move laterally into the neighboring systems that usually share the same electrical neighborhood.
Starter Wiring Diagram →Top A/C & Heater Diagram Paths
1.Electrical Diagrams > Heating and Air Conditioning > Compressor HVACGeneralOpen2.Compressor HVAC — Diagnostic Aids > Pull-to-Seat ConnectorsHeating and Air ConditioningOpen3.Compressor HVAC — Diagnostic Aids > Push-to-Seat ConnectorsHeating and Air ConditioningOpen4.Compressor HVAC — Diagram Information and Instructions > Cell ReferencesHeating and Air ConditioningOpen5.Compressor HVAC — Diagram Information and Instructions > Schematic SymbolsHeating and Air ConditioningOpen6.Compressor HVAC — Diagram Information and Instructions > Symbol IdentificationHeating and Air ConditioningOpen7.Compressor HVAC — Diagram Information and Instructions > Wire Color Code IdentificationHeating and Air ConditioningOpen8.Compressor HVAC — Electrical DiagramsHeating and Air ConditioningOpen9.Compressor HVAC — Exploded ViewsHeating and Air ConditioningOpen10.Components > Miscellaneous Components > Heater/Defrost BI-Directional Vacuum ActuatorGeneralOpen11.Components > Modules > A/C, Heater & Radio Control Interface ModuleGeneralOpen12.Electrical Diagrams > Heating and Air Conditioning > Air Door Actuator / Motor, HVACGeneralOpen13.Exploded Views > Compressor HVACGeneralOpen14.Vacuum and Vapor Hose Diagrams > Heating and Air Conditioning > Air Door Actuator / Motor, HVACGeneralOpen15.Components > Miscellaneous Components > A/C Compressor ClutchGeneralOpen16.Components > Miscellaneous Components > A/C Compressor TransducerGeneralOpen17.Components > Miscellaneous Components > A/C Valve Vacuum ActuatorGeneralOpen18.Components > Relays > A/C Compressor RelayGeneralOpen19.Electrical Diagrams > Heating and Air Conditioning > Blower MotorGeneralOpen20.Electrical Diagrams > Heating and Air Conditioning > System Diagram > Blower ControlsGeneralOpen21.Electrical Diagrams > Heating and Air Conditioning > System Diagram > Compressor ControlsGeneralOpen22.Vacuum and Vapor Hose Diagrams > Heating and Air Conditioning > System DiagramGeneralOpen23.Antilock Brakes / Traction Control Systems — Connector ViewsBrakes and Traction ControlOpen24.Antilock Brakes / Traction Control Systems — Diagnostic Aids > Pull-to-Seat ConnectorsBrakes and Traction ControlOpen25.Antilock Brakes / Traction Control Systems — Diagnostic Aids > Push-to-Seat ConnectorsBrakes and Traction ControlOpen26.Antilock Brakes / Traction Control Systems — Diagram Information and Instructions > Cell ReferencesBrakes and Traction ControlOpen27.Antilock Brakes / Traction Control Systems — Diagram Information and Instructions > Schematic SymbolsBrakes and Traction ControlOpen28.Antilock Brakes / Traction Control Systems — Diagram Information and Instructions > Symbol IdentificationBrakes and Traction ControlOpen29.Antilock Brakes / Traction Control Systems — Diagram Information and Instructions > Wire Color Code IdentificationBrakes and Traction ControlOpen30.Antilock Brakes / Traction Control Systems — Electrical Diagrams > Less STEBrakes and Traction ControlOpen31.Antilock Brakes / Traction Control Systems — Electrical Diagrams > With STEBrakes and Traction ControlOpen32.Electrical Diagrams > Blower ControlsHeating and Air ConditioningOpen33.Electrical Diagrams > Compressor ControlsHeating and Air ConditioningOpen34.Radio, Stereo, and Compact Disc — Diagnostic Aids > Pull-to-Seat ConnectorsAccessories and Optional EquipmentOpen35.Radio, Stereo, and Compact Disc — Diagnostic Aids > Push-to-Seat ConnectorsAccessories and Optional EquipmentOpen36.Radio, Stereo, and Compact Disc — Diagram Information and Instructions > Cell ReferencesAccessories and Optional EquipmentOpen37.Radio, Stereo, and Compact Disc — Diagram Information and Instructions > Schematic SymbolsAccessories and Optional EquipmentOpen38.Radio, Stereo, and Compact Disc — Diagram Information and Instructions > Symbol IdentificationAccessories and Optional EquipmentOpen39.Radio, Stereo, and Compact Disc — Diagram Information and Instructions > Wire Color Code IdentificationAccessories and Optional EquipmentOpen40.Radio, Stereo, and Compact Disc — Electrical Diagrams > Radio/StereoAccessories and Optional EquipmentOpen41.Radio, Stereo, and Compact Disc — Electrical Diagrams > Steering Wheel ControlsAccessories and Optional EquipmentOpen42.Radio, Stereo, and Compact Disc > Radio/Stereo — Diagnostic Aids > Pull-to-Seat ConnectorsAccessories and Optional EquipmentOpen43.Radio, Stereo, and Compact Disc > Radio/Stereo — Diagnostic Aids > Push-to-Seat ConnectorsAccessories and Optional EquipmentOpen44.Radio, Stereo, and Compact Disc > Radio/Stereo — Diagram Information and Instructions > Cell ReferencesAccessories and Optional EquipmentOpen45.Radio, Stereo, and Compact Disc > Radio/Stereo — Diagram Information and Instructions > Schematic SymbolsAccessories and Optional EquipmentOpen46.Radio, Stereo, and Compact Disc > Radio/Stereo — Diagram Information and Instructions > Symbol IdentificationAccessories and Optional EquipmentOpen47.Radio, Stereo, and Compact Disc > Radio/Stereo — Diagram Information and Instructions > Wire Color Code IdentificationAccessories and Optional EquipmentOpen48.Radio, Stereo, and Compact Disc > Radio/Stereo — Electrical DiagramsAccessories and Optional EquipmentOpen
Exact Vehicle Hub
Browse →OEM Manual Evidence
Browse →1990 Pontiac Grand Prix A L L Diagnostic Trouble Codes ( DTC )OEM Manual
A L L Diagnostic Trouble Codes ( DTC ) — 1990 Pontiac Grand Prix L4-138 2.3L DOHC QUAD 4 Service Manual | Operation CHARM Operation CHARM :...
1990 Pontiac Grand Prix A L L Diagnostic Trouble Codes ( DTC )OEM Manual
A L L Diagnostic Trouble Codes ( DTC ) — 1990 Pontiac Grand Prix V6-191 3.1L Service Manual | Operation CHARM Operation CHARM : Car repair...
1990 Pontiac Grand Prix Diagnostic Trouble CodesOEM Manual
Repair and Diagnosis: Diagnostic Trouble Codes — 1990 Pontiac Grand Prix L4-138 2.3L DOHC QUAD 4 Service Manual | Operation CHARM Operation...
1990 Pontiac Grand Prix Diagnostic Trouble CodesOEM Manual
Repair and Diagnosis: Diagnostic Trouble Codes — 1990 Pontiac Grand Prix V6-191 3.1L Service Manual | Operation CHARM Operation CHARM : Car...
More Grand Prix Wiring Pages
Starter Wiring DiagramAlternator Wiring DiagramFuel Pump Wiring DiagramHeadlight Wiring DiagramABS Brake Wiring DiagramPower Window Wiring DiagramInstrument Cluster Wiring DiagramWiper & Washer Wiring DiagramTransmission Wiring DiagramCruise Control Wiring DiagramAirbag SRS Wiring DiagramEngine Management Wiring DiagramBody Electrical Wiring Diagram
Same System, Other Vehicles
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