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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1370 (HVAC SYSTEM - AUTOMATIC)DIAGNOSTIC INFORMATION AND PROCEDURESAIR CONDITIONING COMPRESSOR MALFUNCTIONCOMPONENT TESTING
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2

Component Testing

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Component Testing
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

Relay Testing

  1. Ignition OFF, disconnect the A/C Relay.
  2. Test for 137 ohms across the relay coil terminals.
    • If the resistance is not close to the specified range, replace the relay.
  3. Test for infinite resistance between switch side of the relay
    • If less than infinite resistance, replace the relay
  4. Install a 20-amp fused jumper wire between the relay coil side and 12 volts. Install a jumper wire between relay the coil side and ground. Measure for less than 2 ohms of resistance between the relay switch side.
    • If greater than 2 ohms, replace the relay.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.