Heater Blowing Cold Air

[AllenWrench]

Alright, I went to work yesterday morning and my heater was blowing cold air. I thought I would freeze before I got there. I have a 2003 Chevy Malibu. I'm driving my old work truck until I can see what is wrong. Any ideas?

 

[Andy C]

Have a look at the thermostat. It may be starting to go bad. Have you seen the temperature gauge going wonky? I would have it checked anyway.

 

[Rod]

I second that motion---sounds like a bad thermostat. In my experience, there's no real warning signs. One day you go out, turn the heater on, and just a blast of cold.