SPONSORED LINKS

HVAC control unit

Tiny
KEVNLKING
  • MEMBER
  • 1994 GMC SIERRA
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
The AC/heat control unit keeps flashing when turned on sometimes it stops. Is it the head unit or the blend door actuator?
Friday, June 22nd, 2018 AT 8:23 AM

7 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,640 POSTS
It is flashing is trying to tell you a code can you count the flashes?

Please let me know. Cheers, Ken
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Saturday, June 23rd, 2018 AT 1:53 PM
Tiny
KEVNLKING
  • MEMBER
  • 26 POSTS
What does this mean?
Video (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Sunday, June 24th, 2018 AT 3:23 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,640 POSTS
Thanks for the video! This usually means you have a mode actuator that is not working. Here is a guide to show you what you are in for when doing the job and the location of the actuator for your truck below:

https://www.2carpros.com/articles/replace-blend-door-motor

Check out the diagrams (below). Please let us know what happens.

Cheers, Ken
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
+1
Monday, June 25th, 2018 AT 11:13 AM
Tiny
KEVNLKING
  • MEMBER
  • 26 POSTS
Is this considered manual or automatic controls?
Was this
answer
helpful?
Yes
No
Sunday, July 1st, 2018 AT 10:05 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,640 POSTS
It says they are the same for either. Have you tried to replace the actuator?
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Monday, July 2nd, 2018 AT 11:55 AM
Tiny
KEVNLKING
  • MEMBER
  • 26 POSTS
Not yet, they were asking me if my unit is manual or automatic which I think is manual.
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Monday, July 2nd, 2018 AT 12:02 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I am Danny.

Your application/unit is manual. Hope that helps.
Was this
answer
helpful?
Yes
No
Tuesday, July 3rd, 2018 AT 3:58 AM

Please login or register to post a reply.

Related Climate Control Computer Content

VIEW MORE

Sponsored links