Ac blowing intermittent vent air after battery change. How to reset A/

[No F-bdy Bs]

I know the issue,,,

A/C got out of calibration when I changed the battery.

I can drive for say, 15min,with the Ac on, and it will start blowing vent air.

I can cycle the key, and it will temporarily fix the issue.

 

 

I tried a few procedures I saw on YT, where you pull the 10a hvac fuse, wait 3min,replace the fuse, and not touch the Ac controls while it cycles.

Did a few variations of this procedure, with no luch.

 

 

Any GM techs here have the official procedure?

[swathdiver]

From the GMT900 Manual:

Alternate Method (w/o Scan Tool)

1. Clear all DTCs.

2. Place the ignition switch to the OFF position.

3. Install the HVAC actuator.

4. Connect all previously disconnected components.

5. Remove the HVAC/ECAS fuse for a minimum of 10 seconds.

6. Install the HVAC/ECAS fuse.

7. Start the vehicle.

8. Wait 40 seconds for the HVAC control module to self-calibrate.

9. Verify that no DTCs have set as current DTCs.

IMPORTANT: Do not adjust any controls on the HVAC control module while the HVAC control

module is self-calibrating. If interrupted, improper HVAC performance will

result.

If this isn't working you'll need to see if if there are any internal HVAC codes or malfunctions. Do you know someone with a Tech2?