HVAC Mode Vacuum Line Advice Needed
Thread Starter
Instructor
Joined: Mar 2003
Posts: 125
Likes: 2
From: Grand Island N.Y.
HVAC Mode Vacuum Line Advice Needed
I've read the DIY sticky about a broken vacuum line causing air to come from all vents. I pulled the panel behind the right front wheel and believe I found the vacuum line involved. If I cut the line and apply vacuum to the end going into the passenger compartment and get vacuum to hold I can be pretty sure that the leak is between my cut and the back of the intake mannifold right? If not, it's obviously in the line going into the cabin or in the lines under the dash. I have no idea how you guys get your hand down behind the intake to remove the vacuum line there that's why I'm trying to isolate where it's leaking.
Thanks in advance for the anticipated help.
Thanks in advance for the anticipated help.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
You really need to PULL the intake manifold and extend that line o male it easier to maintain and work on. I used a nylon line repair kit from ADVANCED Auto to extend the vacuum line.
EXTENDED Line:
Here is a stock set up:
REAR OF THE MANIFOLD:
BC
EXTENDED Line:
Here is a stock set up:
REAR OF THE MANIFOLD:
BC
Racer
Joined: Apr 2005
Posts: 443
Likes: 101
From: Jackson CA.
Vacuum line is located in wire bundle below battery. It is black and looks like a wire. Mine was damaged due to leaky battery. I cut it and coupled it and ran new hose to actuator in wheel compartment. You can test vacuum from manifold by doing this. After you cut it, start your car, if you have suction from the piece from the behind the manifold, no need to remove your manifold. Hope that makes sense.
Melting Slicks
Joined: Jul 2006
Posts: 2,332
Likes: 31
From: Silver Spring MD
Same here
[QUOTE=megawatt1203;1578038264]Vacuum line is located in wire bundle below battery. It is black and looks like a wire. Mine was damaged due to leaky battery. I cut it and coupled it and ran new hose to actuator in wheel compartment. You can test vacuum from manifold by doing this. After you cut it, start your car, if you have suction from the piece from the behind the manifold, no need to remove your manifold. Hope that makes sense.
Acid melted and deteriorated both the line coming from the manifold and the line going thru the firewall. Took me 2 days to find the manioild line buried in the harness coming from the engine. Other lines going from check valve inside the right front fender and the check valve were also bad.
Numerous posts on here telling you how to just replace all deteriorated line with vacuum hose. Check valve can be accessed without removing fender by just unscrewing 2 or 3 screws underneath the fender and blocking the fender temporarily with a small piece of wood and putting your hand in there. Even with my huge hands was able to do it easily.
Acid melted and deteriorated both the line coming from the manifold and the line going thru the firewall. Took me 2 days to find the manioild line buried in the harness coming from the engine. Other lines going from check valve inside the right front fender and the check valve were also bad.
Numerous posts on here telling you how to just replace all deteriorated line with vacuum hose. Check valve can be accessed without removing fender by just unscrewing 2 or 3 screws underneath the fender and blocking the fender temporarily with a small piece of wood and putting your hand in there. Even with my huge hands was able to do it easily.
Last edited by bighank; Jul 3, 2011 at 08:04 PM.
