Recently my truck has developed an HVAC problem that has progressively gotten worse. Started with just a cycling 2 seconds front vents to 1 second defrost vents. It is to the point now where it will only blow air through the defrost vent and I have lost the highest fan setting.

I have a BCM error code being thrown relating to Airflow Control Circuit #6.

Does anybody know where this circuit is located on an 03 Silverado SS with manual HVAC controls?

Thanks
Justin

 

Sounds like the vac controler on the damper door has gone bad. I had this in my 03 f150. Turned out to be a vac valve that wet bad. My advise is to get a helms/chilton manual. They have a break down of where each circut is and how to trouble shoot.

 

Unfortunately the Haynes Manual I have is not of much help...

 

humm...have you tried googling the trouble code for info? Just a though.

 

Yep, nothing.