HVAC controller supply no vacuum.
Thread Starter
2nd Gear
Joined: Jul 2024
Posts: 2
Likes: 0
HVAC controller supply no vacuum.
Just got a '96 and the vents were only running on default settings, after some investigation I found there is no vacuum on the black supply line to the controller module. I replaced the check valve on the passenger side with no change.
In the diagram I see a connector for the supply around the firewall, does anyone know where that is?
I can't see anything drivers side and passenger side looks like a bear to take apart.
In the diagram I see a connector for the supply around the firewall, does anyone know where that is?
I can't see anything drivers side and passenger side looks like a bear to take apart.
Safety Car
Joined: Jun 2010
Posts: 4,564
Likes: 1,676
The typical issue for the 96, the nipples on the controller are made of rubber, they can swell/collapse and block passages. That is the first place I would start. The vacuum line comes in through the firewall in a wire bundle at the centerline. It continues into the cabin and it make a connection with the main hvac harness. You wil need to remove the passenger lower dash to access. From there it crosses to the hvac programmer.
There have been several threads on the fix.
https://www.corvetteforum.com/forums...n-my-96-a.html
There have been several threads on the fix.
https://www.corvetteforum.com/forums...n-my-96-a.html
Thread Starter
2nd Gear
Joined: Jul 2024
Posts: 2
Likes: 0
The typical issue for the 96, the nipples on the controller are made of rubber, they can swell/collapse and block passages. That is the first place I would start. The vacuum line comes in through the firewall in a wire bundle at the centerline. It continues into the cabin and it make a connection with the main hvac harness. You wil need to remove the passenger lower dash to access. From there it crosses to the hvac programmer.
There have been several threads on the fix.
https://www.corvetteforum.com/forums...n-my-96-a.html
There have been several threads on the fix.
https://www.corvetteforum.com/forums...n-my-96-a.html
