setting hotter or colder it starts flashing arrows?

1991 CHEVROLET SILVERADO
227,000 MILES • 5.7L • V8 • 4WD • AUTOMATIC
Avatar
JEFFREY L JONES
The fan blows / the doors change from defrost to dash vents to floor but when I try to change the temp setting hotter or colder it starts flashing arrows all the way across the temp setting and stays until I shut the power off when I turn it back on everything looks normal
Jan 25, 2015 at 8:02 AM
Advertisement
Avatar
HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
if this is automatic temp control, I think the HVAC control has gone out.
Jan 25, 2015 at 8:29 AM
Avatar
STRAILER
  • ✓ASE Certified Mechanic
  • 54,494 POSTS
  • ASE Certified Mechanic
Yep, this means the temperature blend door actuator has gone out, here is the location so you can change it out to help fix the problem. Check out the images (below). Let us know if you need anything else.
Image (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Sep 12, 2024 at 6:29 PM
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 Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.