today the led lights that indicate hot or cold started blinking.

1994 CHEVROLET SILVERADO
195,000 MILES • 5.7L • V8 • 2WD • AUTOMATIC
Avatar
TATDAD70
  • MEMBER
  • 1 POST
I have recently heard the blower motor making bad sound like it needs replaced. But today the led lights that indicate hot or cold started blinking. It shows temperature close to hot but then after a few seconds it blinks. No heat after it starts.
Nov 19, 2019 at 6:44 PM
Advertisement
Avatar
STRAILER
  • CERTIFIED EXPERT
  • 53,854 POSTS
Hello,

This can happen when a blend door actuator goes out and the system cannot control itself. Here are the locations of the blend doors and a guide to help walk you through the inspection. Move each one to see if they move at all when working the HVAC system.

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

Check out the diagrams (below). Please let us know what you find.
Image (Click to enlarge)
Attached Media
Nov 20, 2019 at 8:32 PM