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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1725 (HVAC Systems - Manual) >> Diagnostic Information and Procedures >> DTC P0645, P0646 Or P0647: Open Or Short To Ground On Control Circuit Of The A/C Compressor Clutch Relay >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Be sure to verify that the ECM engine grounds are secure and clean.

If DTC P645, P0646 and P0647 cannot be duplicated, reviewing the Failure Records vehicle millage since the diagnostic test last failed may help determine how often the condition that caused the DTC to set occurs. This may assist in diagnosing the condition.

If the condition is not present, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

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