Hi guys. Once you figure out the mode operation, there was a common problem that causes it to blow only cool air. The clue is that both heater hoses are hot so you know it's circulating hot coolant and should be blowing hot air. An additional potential clue is you won't hear the nice "thump" of the temperature door when you slide the temperature lever back and forth.
If the air doesn't switch to different outlets, look for a broken or disconnected vacuum hose under the hood. When the vacuum supply is lost to the heater controls, the system is spring-loaded to go to defrost so even though your feet might freeze, the windshield will be clear.
Monday, December 12th, 2011 AT 10:16 PM