ZR-1 Net Registry Forums - View Single Post - Has anybody ever replaced the HVAC Programmer?

QB93Z · 02-25-2017

I have been trouble-shooting an HVAC problem on my Yellow 1994 ZR-1 for a while now. I replaced the Heater Door Control Motor and it fixed on problem, no heat in any mode.

But I still have a problem that in normal operation, all of the air flow comes out the windshield defroster grill instead of the passenger grills on the dash.

After all the trouble shooting in the manual I got to the step to replace the HVAC Programmer. The Programmer is a small box that distributes a vacuum source to 4 pneumatically operated flappers.

The problem is that I can't get the Programmer out. It is located about 14 inches above the gas pedal. There is a lot of wiring and other parts and pieces in the way of removing it. It has an electrical connector and a manifold with 5 vacuum lines.

Has anyone ever worked on this?

Jim

02-25-2017	#1
QB93Z Join Date: May 2007 Location: Westminster, Maryland Posts: 3,684	Has anybody ever replaced a HVAC Programmer? I have been trouble-shooting an HVAC problem on my Yellow 1994 ZR-1 for a while now. I replaced the Heater Door Control Motor and it fixed on problem, no heat in any mode. But I still have a problem that in normal operation, all of the air flow comes out the windshield defroster grill instead of the passenger grills on the dash. After all the trouble shooting in the manual I got to the step to replace the HVAC Programmer. The Programmer is a small box that distributes a vacuum source to 4 pneumatically operated flappers. The problem is that I can't get the Programmer out. It is located about 14 inches above the gas pedal. There is a lot of wiring and other parts and pieces in the way of removing it. It has an electrical connector and a manifold with 5 vacuum lines. Has anyone ever worked on this? Jim Last edited by QB93Z; 03-12-2017 at 11:23 AM.