Operation CHARM
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GMC Truck
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1994
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C 2500 Suburban 2WD V8-454 7.4L
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Repair and Diagnosis
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Heating and Air Conditioning
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Control Assembly
Control Assembly
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Testing and Inspection
With A/C
Control Head Display Blank Or Door Motors Inop
Display Does Not Dim Properly
Incorrect Air Delivery Or Mode Indicators Flashing
None of the Door Motors Operate Correctly
Temperature Door Motor Inop Or TEMP Cursors Flash
Without A/C
Locations
A/C Controller
Auxiliary Heater and A/C Control Assemblies
Heater Control
Service and Repair
Diagrams
C23O Heater-A/C Controller to I/P
C23O I/P to Heater-A/C Controller
C230A A/C Controller
C250A Heater Control Lamp
C263 Extension Harness to Rear Auxiliary Heater Control
C263 Rear Auxiliary Heater Control to Extension Harness
C264 Rear Auxiliary Heater Control
Technical Service Bulletins