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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 29 (HVAC System - Manual) >> Diagnostic Information and Procedures >> DTC P0645, P0646, or P0647: A/C) Compressor Clutch Relay >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.

Compressor Clutch Test

  1. Ignition OFF, disconnect the Q2 A/C Compressor Clutch.
  2. Test for 3.9 - 4.3 Ω between terminal A and terminal B.
    • If not between 3.9 - 4.3 Ω 

      Replace the Q2 A/C Compressor Clutch.

    • If between 3.9 - 4.3 Ω 
  3. Test for infinite resistance between terminal A and ground.
    • If less than infinite resistance 

      Replace the Q2 A/C Compressor Clutch.

    • If infinite resistance 
  4. All OK.