Rear ac blows in my 2004 Chevy trailblazer when vehicle is off. Front ac is off. What could be the problem? Just started after changed coil pack and hooked battery back up.

SOURCE: tachometer gauge

your relay is going bad, replace it.

SOURCE: 2002Chevy trailblazer engine cuts off when heater & ac is on

remove the airintake boot and clean throttle butterfly with a rag and carb cleaner

SOURCE: AC Blows cold then hot

I had this happend to me on my 2004 2500 in july in S.C.I turned the key off and on 5-6 times and i have not had that problem again.

maholmes

• 38 Answers
• Posted on Aug 12, 2009

SOURCE: I have a 2004 chevy trailblazer. My problem is the

There maybe some thing wrong with the air direction door. Or the actuator that operates it. This is probably a dealer fix but check local auto A/C repair shops to see if they can do this kind of work.

SOURCE: rear heater only blows cold air...front of cab

might have dual heater cores rear core might be bad or trying to plug up