Climate control issues

[Eagleman]

Hi all I'm new here.
I have an issue with my ac/heater. I have no airflow coming out of vents, only out of defrost. I replaced climate control module. 2004 Chevy Tahoe. Duel temp digital control. Rear fan works.

 

[wjburken]

Welcome to the forum from Iowa.

Sounds to me like you have a mode door actuator that has given up the ghost.

 

[Miami-Dade]

@Eagleman Moved you here from Intro section.
Welcome from Miami Beach!

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

It does sound like a blend door issue, and @swathdiver may be able to assist you with your issue.

 

[RAMurphy]

Welcome to this great forum.

 

[afpj]

. I replaced climate control module. 2004 Chevy Tahoe. Duel temp digital control. Rear fan works.

What did you replace the hvac module with? Used, new aftermarket? As others said, could be mode door, but I’ve seen some used control modules require programming.

 

[Eagleman]

New module, tried programming.

 

[Fless]

Need details, please, on which specific HVAC module (mfr & model) you picked up for the replacement. Likely your original HVAC module is good, it sounds more like a actuator issue as @wjburken noted.

What technology (GM TDS/SPS?) are you using for programming, and I assume that it wasn't successful? ("tried programming")

 

[Eagleman]

Dorman from O'Reilly. I was also thinking door actuator also. Going to do a little bit more investigating. Will let you know. Thanks

 

[Fless]

I believe that the Dorman modules don't need any programming or calibration (firmware).