Heater Performance: Notes

See appropriate service information 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 System Performance Test, which is found within the HVAC System Test. Refer to STANDARD PROCEDURE . If any Diagnostic Trouble Codes (DTCs) are found, repair as necessary.