What to do ?
Nordschleife Master
Joined: Jul 2011
Posts: 5,662
Likes: 25
From: North Country
Hey there Andre.
What you want to do with all the lines is see if they HOLD vacuum by using a MityVac. With the lines that go to the flaps, if they don't hold vacuum it means the diaphragm is likely torn (most common) or the line itself is faulty somewhere along its course. The line that goes to the heater valve should operate the valve arm when vacuum applied, and hold it's vacuum. The vacuum source line should have adequate vacuum when engine running. 20ml H20 comes to mind, but check the value on this from the write ups.
You can 'tie off' the heater valve arm for the warm weather. You might miss it on a cool morning in our part of the world. Do a Search on this. There is a good thread on this with pics. It involves drilling a small hole in the arm so you can tie a wire around it. It is kind of awkward otherwise.
Best Wishes.
Craig
What you want to do with all the lines is see if they HOLD vacuum by using a MityVac. With the lines that go to the flaps, if they don't hold vacuum it means the diaphragm is likely torn (most common) or the line itself is faulty somewhere along its course. The line that goes to the heater valve should operate the valve arm when vacuum applied, and hold it's vacuum. The vacuum source line should have adequate vacuum when engine running. 20ml H20 comes to mind, but check the value on this from the write ups.
You can 'tie off' the heater valve arm for the warm weather. You might miss it on a cool morning in our part of the world. Do a Search on this. There is a good thread on this with pics. It involves drilling a small hole in the arm so you can tie a wire around it. It is kind of awkward otherwise.
Best Wishes.
Craig
Thread Starter
Rennlist Member
Joined: Mar 2014
Posts: 917
Likes: 23
From: Gatineau, QC
Hey there Andre.
What you want to do with all the lines is see if they HOLD vacuum by using a MityVac. With the lines that go to the flaps, if they don't hold vacuum it means the diaphragm is likely torn (most common) or the line itself is faulty somewhere along its course. The line that goes to the heater valve should operate the valve arm when vacuum applied, and hold it's vacuum. The vacuum source line should have adequate vacuum when engine running. 20ml H20 comes to mind, but check the value on this from the write ups.
You can 'tie off' the heater valve arm for the warm weather. You might miss it on a cool morning in our part of the world. Do a Search on this. There is a good thread on this with pics. It involves drilling a small hole in the arm so you can tie a wire around it. It is kind of awkward otherwise.
Best Wishes.
Craig
What you want to do with all the lines is see if they HOLD vacuum by using a MityVac. With the lines that go to the flaps, if they don't hold vacuum it means the diaphragm is likely torn (most common) or the line itself is faulty somewhere along its course. The line that goes to the heater valve should operate the valve arm when vacuum applied, and hold it's vacuum. The vacuum source line should have adequate vacuum when engine running. 20ml H20 comes to mind, but check the value on this from the write ups.
You can 'tie off' the heater valve arm for the warm weather. You might miss it on a cool morning in our part of the world. Do a Search on this. There is a good thread on this with pics. It involves drilling a small hole in the arm so you can tie a wire around it. It is kind of awkward otherwise.
Best Wishes.
Craig
