Heater Core " Plugged
WARNING: The heater core inlet hose will become too hot to handle if the system is working correctly.
Check to see that the engine coolant is at the correct level.
Start the engine and turn on the heater.
When the engine coolant reaches operating temperature, feel the heater core inlet and outlet hose to see if they are hot.
If the inlet hose is not hot:
the thermostat is not working correctly.
If the outlet hose is not hot:
the heater core may have an air pocket.
The heater core may be restricted or plugged.
If both are hot, the temperature blend door in the heater plenum may be broken or stuck.
For auto temp control(EATC) try this and post all codes.
Run the self diagnostic test on it by turning the key to on, then press off and floor at the same time, then within 2 secs, press auto, If there is a problem a trouble code will appear on the display. To exit self test, press the BLUE, cooler button this also retains error codes, To erase codes and exit, press defrost, choose one of these before you power down the system. Test with engine at 120 degrees or more, and cabin between 40-90 degrees. Post any codes recorded here and I let you know what's defective.
Thursday, November 26th, 2009 AT 7:29 AM