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Heater Performance: Notes

WARNING: This page is about a different car, the 2009 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

See COOLING before performing the following tests. Check the engine coolant level and flow, engine coolant reserve/recovery system operation, accessory drive belt condition and tension, radiator air flow and the fan drive operation. Perform the A/C PERFORMANCE TEST , which is found within the HVAC System Test. Refer to DTC-Based Diagnostics/HVAC - Standard Procedure . If any Diagnostic Trouble Codes (DTCs) are found in CONTROL, A/C and Heater  or Powertrain Control Module (PCM) or Engine Control Module (ECM), repair as necessary.

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