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Home >> Chevrolet >> 2017 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 38 (HVAC System - Automatic) >> Diagnostic Information and Procedures >> DTC P0645, P0646, or P0647 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. 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 terminals 1 and 2.
    • If not between 3.9 - 4.3 Ω 

      Replace the Q2 A/C Compressor Clutch.

    • Go to next step: If between 3.9 - 4.3 Ω 
  3. All OK.