I will assume the engine is running at a normal operating temp, and the blower motor is working. To check the function of the doors, you will need to craw under the dash, identify the HVAC duct work, and remove it to get into the doors. Before doing that, however, with the engine at normal operating temp and the heater on, make sure both heater hoses are getting hot.
Let me know what you find.
Monday, December 8th, 2008 AT 10:36 AM