Heat/Air Control

[85mustangGT]

99 Bravada with climate control

I am having an issue with my temp setting for my heat/air. When I move it to heat, sometimes it will heat and sometimes it just blows cool or warm, sometimes when I move it to cool it will blow heat. I thinks its either the temp controller or the door that opens/closes near the heater corel. I think that door that opens/closes is directly behind the dash and could suck to get to for me to check it. All other controls work great (fan speed and vent,defrost position)

Which one of these would most likely be the problem child?

My antifreeze is full and I blew out the heater core with air (which nothing came out of but antifreeze)

Truck runs fine so I dont think it has a vaccum leak.

Thanks a bunch

[ericn1300]

There is a good post here about a 98 blend door fix (with pictures and the common problem), not really sure if it's applicable to a 99 but check it out.
http://www.automotiveforums.com/vbul...ght=blend+door

[batestamalik]

What is wrong with my car's heating/air control system?

[85mustangGT]

Originally Posted by ericn1300

There is a good post here about a 98 blend door fix (with pictures and the common problem), not really sure if it's applicable to a 99 but check it out.
http://www.automotiveforums.com/vbul...ght=blend+door

Thanks so much, I will try and tackle it this weekend.