Operation CHARM
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Chevrolet
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1990
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Lumina L4-151 2.5L
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Repair and Diagnosis
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Heating and Air Conditioning
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Air Door
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Air Door Actuator / Motor
Air Door Actuator / Motor
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Description and Operation
Testing and Inspection
Initial Inspection and Diagnostic Overview
System Check
With A/C
Without A/C
System Diagnosis
With A/C
Without A/C
Troubleshooting Hints
With A/C
Without A/C
Component Tests and General Diagnostics
With A/C
Test A - Solenoid
Table 1 of 2
Table 2 of 2
Test B - Heater & A/C Control Assembly Solenoid Control
Test C - Air Temperature Valve Motor
Table 1 of 2
Table 2 of 2
Without A/C
Test A: Solenoid Test
Table 1 of 2
Table 2 of 2
Test B: Heater Control Assembly Solenoid Control Test
Test C: Air Temperature Valve Motor Test
Table 1 of 2
Table 2 of 2
Locations
Service and Repair
Air Inlet Actuator Replace
Air Inlet Valve Replace
Temperature Valve Replace
Mode Valve Replace
Mode Valve Vacuum Actuator Replace
Diagrams
Diagram Information and Instructions
Cell References
Schematic Symbols
Symbol Identification
Wire Color Code Identification
Diagnostic Aids
Pull-to-Seat Connectors
Push-to-Seat Connectors
Electrical Diagrams
With A/C
Without A/C
