Eric (71.134.235.127) - Sat Oct 24 00:10:00 2009

My 2000 Chrysler 300M is not blowing hot air! The fans work normally and the AC works great. Once the car has warmed up I turn on the heat, set to high, and get a burst of warm air and then it starts blowing slightly, and i mean slightly warm air after that. The AC is not on at this time so I know that the AC is not cooling the hot air. Are there any fuses, valves, switches that I should check? I'm hoping its not the heater core.. i hear its a bear to get to.

Oh, also had the thermostat replaced the radiator system pressure flushed hoping this would correct the problem.. it didn't.

Thanks in advance.

Eric

Reply #1 nash (68.198.24.183) - Sun Nov 1 15:19:56 2009

1. Start the engine but do not move the vehicle.

2. Set the Temp control to 75 degrees.

3. Press and hold the Floor, Mix (vent/defrost) and Defrost buttons at the same time. The floor is a bottom button and the others are upper.

4. The control head will begin to blink and enter a diagnostic mode.

5. Release the Floor, Mix and Defrost buttons.

Once the unit has gone through its diagnostics it will either return to its normal mode (with all air doors calibrated) or it will return one or more of 16 different error codes between 23 and 51. The ATC control can only show one diagnostic trouble code at a time. Under certain circumstances, more than one diagnostic trouble code could be in the membory. To scroll through any additional diagnostic trouble codes, press the Panel Mode button on the ATC control. Any other button or turning of a knob will end the diagnostic test without showing the rest of the trouble codes.

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