Operation CHARM
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GMC Truck
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1992
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Suburban 3/4 Ton 2WD V8-454 7.4L
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Repair and Diagnosis
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Heating and Air Conditioning
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Blower Motor
Blower Motor
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Description and Operation
Primary Heater System
Rear Auxiliary Heater
Blower Controls
With A/C
Without A/C
Testing and Inspection
With Air Conditioning
Blower Motor Does Not Operate In LO and/or Med But Only In Hi
Blower Motor Does Not Run In LO Speed Only
Blower Motor Does Not Run In Med Speed Only
Front
Blower Motor Does Not Operate at All
Blower Motor Does Not Operate In LO and/or Med But Only In Hi
Blower Motor Does Not Run In Med Speed Only
Blower Motor Does Not Run In LO Speed Only
Blower Motor Does Not Run In Hi Speed Only
Rear
Rear Blower Motor Does Not Operate at All
Rear Blower Inop In Low And/Or Med, OK in Hi
Rear Blower Motor Does Not Run In Hi Speed Only
Rear Blower Operates Only From Console Front Control Switch
All Blower Speeds Operate Only From Console Rear Control Switch
Without Air Conditioning
Front
Blower Motor Does Not Operate at All
Blower Motor Does Not Operate In HI, Operates In LO and/or MED
Blower Motor Does Not Operate In LO and/or MED But Only In HI
Rear
Rear Blower Does Not Operate In Any Speed
Rear Blower Motor Doesn't Operate In HI But In LO or MED
Rear Blower Operates In HI But Not In LOW or MED
Locations
Auxiliary Heater & A/C Blower Motor
Blower Motor
With Air Conditioning
Front
Rear
Without Air Conditioning
Front
Rear
Service and Repair
With Air Conditioning
Front
Rear
Without Air Conditioning
Front
Rear
Diagrams
Diagram Information and Instructions
Cell References
Schematic Symbols
Symbol Identification
Part 1 of 3
Part 2 of 3
Part 3 of 3
Wire Color Code Identification
Diagnostic Aids
Connector, Splicing and Terminal Repair
Pull-to-Seat Connectors
Push-to-Seat Connectors
Repairing Connectors
Terminal Repair
Weather Pack Connectors
Tech Tips
Basic Circuit Operation
Electricity
Series Circuit
Parallel Circuit
Series/Parrel Circuit
General Troubleshooting Procedures
Basic Troubleshooting Guide
Troubleshooting Tools
Troubleshooting Tests
Intermittents and Poor Connections
Checking Terminal Contact
Circuit Malfunctions
Open Circuit
Short Circuit
Grounded Circuit
Handling and Measuring Procedures
Typical Electrical Repair
Wire Repair Procedures
Circuit Protection Devices
Typical Electrical Repair
Splicing Copper Wire Using Crimp and Seal Splice Sleeves
Splicing Copper Wire Using Splice Clips
Splicing Twisted/Shielded Cable
Electrical Diagrams
Primary Heater System
Rear Auxiliary Heater
Technical Service Bulletins
Description and Operation
Testing and Inspection
Locations
Service and Repair
Diagrams
Technical Service BulletinsDescription and OperationTesting and InspectionLocationsService and RepairDiagramsTechnical Service Bulletins