rear heat not working

2001 CHEVROLET SUBURBAN
105,000 MILES • V8 • 4WD • AUTOMATIC
Avatar
NOSAGROY
  • MEMBER
  • 4 POSTS
my 2001 suburban rear heat blend door isn't working. I have tried replacing with a new rear air controller and also a new blend door actuator. The blend door does not seem to be stuck because I can manually rotate the door quite easily and then get hot air. however, when I turn the air/fan off the blend door goes back to the default position and then I get cold air again. What could be causing the problem?
Nov 27, 2010 at 9:31 PM
Advertisement
Avatar
JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
Is it vacuum actuated?
Nov 27, 2010 at 9:37 PM
Avatar
NOSAGROY
  • MEMBER
  • 4 POSTS
I don't think so. it looks to be all electric controls
Nov 27, 2010 at 9:55 PM
Avatar
JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
Okay, check to see if the blend actuator is getting power. (sorry I had to ask. It seems like they change things every 5 minutes.)
Nov 27, 2010 at 11:16 PM
Avatar
NOSAGROY
  • MEMBER
  • 4 POSTS
I'm not the best at electrical systems, but I think it is getting power. I took the actuator off and when I adjusted the temperature the gears moved on the actuator. - I did some other research over the weekend and saw someone post that they had a similar problem and needd to have the computer reset. Does this sound possible? they said it had to be done at the dealership though. Is this true?
Nov 29, 2010 at 11:44 AM
Avatar
JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
That is possible, but if the actuator is moving, it sounds good. When attached to the blend door, does it move the door?
Nov 29, 2010 at 4:14 PM
Avatar
NOSAGROY
  • MEMBER
  • 4 POSTS
No, the door doesn't move when the actuator is attached. I can turn it with my fingers though very easily.
Nov 29, 2010 at 6:06 PM
Avatar
JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
Then the actuator must be bad and unable to move it.

Nov 30, 2010 at 4:41 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle