The driver side has heat but the passenger side is blowing cold air?

CARVEREOD

MEMBER
2003 CHEVROLET AVALANCHE
335,000 MILES

The heater blew only cold air, so I replaced Blend Door Actuator on lower passenger side. Now the driver side has heat but the passenger side is blowing cold air. I attempted to have system relearn (calibrate) by disconnecting fuse, wait, reconnect, run engine, turn off then turn on... The information for this method contradicts itself. I have seen where it says 10 seconds and 2 minutes for the fuse removal. So, I’m lost, can you please help?

2 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,643 POSTS

I believe the passenger side actuator is on the top of the HAVC system.

Here is a guide to help you see what's going on:

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

Scroll down to see the locations. Please go over this guide and report back.

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Saturday, October 22nd, 2022 AT 6:07 PM

CARVEREOD

MEMBER
1 POST

Okay. So, I replaced the Blend Motor Actuator on the 2003 Chevrolet Avalanche because it was blowing hot on the driver side and cold on passenger side. I replaced it twice. I'm still having the same problem. I attempted to have both parts "relearn" (calibration). I still have the same problems. The blend door actuator was located on the passenger side floorboard area. Can you help?

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Thursday, October 27th, 2022 AT 8:12 PM