sd_iconoclast
Active Member
- Joined
- February 17, 2012
- Messages
- 91
- Reaction score
- 28
- City, State
- San Diego, CA
- Year, Model & Trim Level
- 1991 Explorer
I have a '91 Explorer EB 4x4 5speed.
I am looking for a vacuum leak and I suspect the little temperature switch in the air cleaner. It is the thing that opens and closes the door that pulls hot air off the exhaust manifold.
I see this thing referred to as an "ACL Bimetal switch" in some vacuum diagrams.
It has two vacuum lines attached to it. One goes to the vacuum tree on the intake manifold. The other goes to the air door that switches between hot air (off the exhaust manifold) and cold air.
When I connect a hand vacuum pump to the intake side, I find that it will not hold vacuum. The air door diaphragm will hold vacuum.
Is my ACL Bimetal switch bad?
I am looking for a vacuum leak and I suspect the little temperature switch in the air cleaner. It is the thing that opens and closes the door that pulls hot air off the exhaust manifold.
I see this thing referred to as an "ACL Bimetal switch" in some vacuum diagrams.
It has two vacuum lines attached to it. One goes to the vacuum tree on the intake manifold. The other goes to the air door that switches between hot air (off the exhaust manifold) and cold air.
When I connect a hand vacuum pump to the intake side, I find that it will not hold vacuum. The air door diaphragm will hold vacuum.
Is my ACL Bimetal switch bad?