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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 775 (HVAC System - Manual) >> Diagnostic Information and Procedures >> Blower Motor Malfunction >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

HVAC Relay

  1. Ignition OFF, disconnect the HVAC relay.
  2. Test for 60-180 ohms between terminals 85 and 86.
    • If the resistance is not within the specified range, replace the relay.
  3. Test for infinite resistance between the following terminals:
    • 30 and 86
    • 30 and 87
    • 30 and 85
    • 85 and 87
    • If not the specified value, replace the relay.
  4. Install a 30A fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.
    • If greater than the specified range, replace the relay.

Blower Motor

  1. Ignition OFF, disconnect the harness connector at the blower motor.
  2. Install a 30A fused jumper wire between the B+ circuit terminal B and 12 volts. Install a jumper wire between the control circuit terminal A and ground. Verify the blower motor activates.
    • If the blower motor does not activate, replace the blower motor.
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