what is this hose for? - MustangForums.com


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Old 05-08-2013, 06:34 AM   #1
GTnotchback
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Default what is this hose for?

This is an image off the net, not my car but i need to know what is this vacume line for? (the one on the right that curves down under the main harness and into the firewall. thanks
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Old 05-08-2013, 07:34 AM   #2
88 orangepeel notch
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I think that's the vacume line that runs your heating/cooling switches. The ductwork under the dash has vacume operated doors/panels for defrost, heat, vent etc.
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Old 05-08-2013, 08:27 AM   #3
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Yes, that is the vacuum source for your HVAC which connects under the dash assembly.
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Old 05-08-2013, 09:08 AM   #4
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ahhh. I do not have this 3 way anymore on my car. No wonder only defrost mode works lol! can i hook just that one line into my main vac tree? I dont think it would get too much vac then would it?
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Old 05-08-2013, 09:15 AM   #5
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I may be wrong but the round piece ther in the pic is a damper of sorts to control the speed at which the vacuum is applied so the doors don't smack open and closed..
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Old 05-08-2013, 10:57 AM   #6
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Quote:
Originally Posted by dawson1112 View Post
I may be wrong but the round piece ther in the pic is a damper of sorts to control the speed at which the vacuum is applied so the doors don't smack open and closed..
i found a diagram that says that is a check valve. Im not sure of its purpose. I dont see air flowing the wrong way?
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Old 05-08-2013, 11:07 AM   #7
rmodel65
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Quote:
Originally Posted by GTnotchback View Post
i found a diagram that says that is a check valve. Im not sure of its purpose. I dont see air flowing the wrong way?

its for when the vaccuum dumps when you open the throttle it doesnt dump all the vacuum in the lines otherwise the vents would be constantly switching from the dash to defrost everytime you left a traffic light
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Old 05-08-2013, 01:06 PM   #8
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Quote:
Originally Posted by rmodel65 View Post
its for when the vaccuum dumps when you open the throttle it doesnt dump all the vacuum in the lines otherwise the vents would be constantly switching from the dash to defrost everytime you left a traffic light
ok that makes sense now. thanks guys!
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