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

Tiny
TATDAD70
  • MEMBER
  • 1994 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 195,000 MILES
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.
Tuesday, November 19th, 2019 AT 6:44 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,512 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.
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Wednesday, November 20th, 2019 AT 8:32 PM

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