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Heating Performance Diagnostic

WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Were you sent here from TROUBLE SHOOTING or another diagnostic procedure? If so, go to next step. If not, go to TROUBLE SHOOTING  .
  2. Start engine. Allow the engine to idle. Does the engine reach a normal operating temperature? If so, go to next step. If not, go to step  9 .
  3. Allow the engine to idle. Select the FLOOR mode. Select the minimum blower speed. Select the warmest temperature setting. Feel the temperature of the inlet and outlet heater hoses at the heater core. Does the inlet heater hose feel warmer than the outlet heater hose? If so, go to step  7 . If not, go to next step.
  4. Install a thermometer into the Instrument Panel (I/P) center air outlet. Secure a thermometer to the heater core outlet hose. Select the PANEL mode. Select the maximum blower speed. Select the warmest temperature setting. Record the temperature at the following locations:
    • The I/P center air outlet.
    • The heater core outlet hose.

    Compare the recorded temperatures. Are the 2 temperature readings about equal? If so, go to next step. If not, go to step  6 .

  5. Inspect and repair the following areas of the vehicle for cold air leaks: cowl, recirculation door and HVAC module case. Perform the necessary repairs. Are the repairs complete? Go to step  10 .
  6. Inspect the temperature door operation. See DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. Perform any necessary repairs. After repairs are completed, go to step  10 .
  7. Turn the engine off. Backflush the heater core. Start engine. Select the FLOOR mode. Select the minimum blower speed. Select the warmest temperature setting. Feel the temperature of the inlet and outlet heater hoses at the heater core. Does the inlet heater hose feel warmer than the outlet heater hose? If so, go to next step. If not, go to step  10 .
  8. Replace the heater core. See HEATER CORE  under REMOVAL & INSTALLATION. After repairs are completed, go to step  10 .
  9. Repair the low engine temperature concern. After repairs are completed, go to next step.
  10. Operate system to verify repair. Did you find and correct the condition? If so, system is okay. If not, go to step  2 .
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