ZR-1 Net Registry Forums - View Single Post - Climate control, all defrost all the time.

secondchance · 07-24-2017

Default position, as Jim stated, is defrost. Once with the motor off and ignition on, I was getting air only in defroster mode regardless of HVAC control button position. I thought it was broken until I realized there was no vacuum since the motor was not running resulting in flapper in default position.
I would start with vacuum to the controller.

07-24-2017	#3
secondchance Join Date: Aug 2006 Location: McLean, VA Posts: 3,730	Re: Climate control, all defrost all the time. Default position, as Jim stated, is defrost. Once with the motor off and ignition on, I was getting air only in defroster mode regardless of HVAC control button position. I thought it was broken until I realized there was no vacuum since the motor was not running resulting in flapper in default position. I would start with vacuum to the controller.