Vacuum Powered AC controls Question 73 C3
Thread Starter
Cruising
Joined: May 2018
Posts: 10
Likes: 4
Vacuum Powered AC controls Question 73 C3
Hello all,
I am currently restoring a 1973 C3 and have a few questions in regards to the Vacuum AC door system.
First, I have replaced each actuator (the three inside and one outside) and the vacuum/vent controller. The vacuum lines are still original. Each feed from the controller that connects to the actuators as well as the supply line has been tested and hold vacuum indefinitely.
The concern is when the system is all working together. I placed a hand help pump on the supply lines and pumped up the system in the off position and was able to maintain, but with still a continued drop in vacuum. As I work my way down, the rate at which the vacuum fell increased to where during the DEF setting I could only bounce the vacuum pump needle from 0 to 5 then an immediate drop. PLEASE SEE YOUTUBE LINK TO VIDEO TEST
Is this Normal? The controller is supposed to vent out?, but this extreme? You can hear the air when changing the controller setting. What recommendations are there to fix this?
All the Best
-Will
I am currently restoring a 1973 C3 and have a few questions in regards to the Vacuum AC door system.
First, I have replaced each actuator (the three inside and one outside) and the vacuum/vent controller. The vacuum lines are still original. Each feed from the controller that connects to the actuators as well as the supply line has been tested and hold vacuum indefinitely.
The concern is when the system is all working together. I placed a hand help pump on the supply lines and pumped up the system in the off position and was able to maintain, but with still a continued drop in vacuum. As I work my way down, the rate at which the vacuum fell increased to where during the DEF setting I could only bounce the vacuum pump needle from 0 to 5 then an immediate drop. PLEASE SEE YOUTUBE LINK TO VIDEO TEST
Is this Normal? The controller is supposed to vent out?, but this extreme? You can hear the air when changing the controller setting. What recommendations are there to fix this?
All the Best
-Will
Melting Slicks
Joined: Feb 2018
Posts: 2,328
Likes: 724
From: Marietta GA
Have you tested the vacuum selector switch located on the center console. They have a tendency to leak, and the new replacement switches are even worse. I think Ernie from Wilcox had a video on how to repair the vacuum switch. He was such a talented guy, I hope someone has a saved his YouTube videos, they were extremely helpful.
