A/C controls stuck on defrost

Tiny
MATOEMIS
  • MEMBER
  • 2002 CHEVROLET SILVERADO
  • 4.8L
  • 4WD
  • AUTOMATIC
  • 270,000 MILES
New actuator new control unit truck still stuck on defrost.
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Sunday, June 9th, 2019 AT 7:49 AM

4 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Welcome to 2CarPros.

Was it the mode door actuator that was replaced? Take a look through this link.

https://www.2carpros.com/articles/air-vents-stay-in-the-defrost-position

Now, often times people end up in error replacing the blend air door actuator or even the recirculation door actuator. I attached a picture of the mode actuator which is where the problem lies. Please confirm this is the part you replaced. It is part 10 in picture 1.

I will also need to know if this has automatic climate control or manual.

If you replaced the correct one, I need you to look at pic 2. Check the pins indicated in the picture to confirm there is power and ground. Pin allocations are common for both manual and automatic climate control.

If there is no power, next confirm that fuse 2 is good in the left instrument panel fuse box. See picture 3.

I don't know if you need them, but here are a few links you may find helpful:

https://www.2carpros.com/articles/how-a-car-fuse-works

https://www.2carpros.com/articles/how-to-check-a-car-fuse

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

Let me know what you find.

Take care,
Joe

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Sunday, June 9th, 2019 AT 7:21 PM
Tiny
MATOEMIS
  • MEMBER
Replaced #10 driver side. It has power and ground. Manual climate controls. A while back It started working fine again for about a week then went back to defrost.
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Monday, June 10th, 2019 AT 5:42 AM
Tiny
MATOEMIS
  • MEMBER
Pluging my test light in to the ground on that clip I can get it to light on one other wire.
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Monday, June 10th, 2019 AT 5:46 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Welcome back:

It sounds like a connection issue. Which wire does it light on? You should see low voltage from a few wires.

Joe
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Monday, June 10th, 2019 AT 7:01 PM

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