A/C Went Out - Page 3 - ZR-1 Net Registry Forums

Starman · 06-01-2013

Issue I had a couple of years ago with my HVAC in the ZR1, it would work fine when the car was started and then after 15 or so minutes would reset the set point to 75 degrees and then have to hunt the mix door locations. This is done by cycling the door full open and closed which takes over a minute in our cars.

Imagine the fun of full blast heat on a 95 degree day. I also caught some erratic exterior temp readings, like 178 degrees at times. This behavior became more consistent over about a year and I finally figured out that it was acting like power was being cycled. I pulled the control head unit and took it apart. It has a power supply capacitor of the same crappy quality as in the Bose amplifiers - replaced it and re-soldered what appeared to be a few cold solder connections and it has worked perfectly since. Don't forget there is a screw in the duct above the center console or you break that irreplaceable bezel.

06-01-2013	#21
Starman Join Date: Sep 2008 Location: Speedway, IN Posts: 133	Re: A/C Went Out Issue I had a couple of years ago with my HVAC in the ZR1, it would work fine when the car was started and then after 15 or so minutes would reset the set point to 75 degrees and then have to hunt the mix door locations. This is done by cycling the door full open and closed which takes over a minute in our cars. Imagine the fun of full blast heat on a 95 degree day. I also caught some erratic exterior temp readings, like 178 degrees at times. This behavior became more consistent over about a year and I finally figured out that it was acting like power was being cycled. I pulled the control head unit and took it apart. It has a power supply capacitor of the same crappy quality as in the Bose amplifiers - replaced it and re-soldered what appeared to be a few cold solder connections and it has worked perfectly since. Don't forget there is a screw in the duct above the center console or you break that irreplaceable bezel.