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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 05-08-2013, 05:34 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, 06:34 AM   #2
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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, 07:27 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, 08:08 AM   #4
GTnotchback
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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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347 stroker 10:1 compression
new FMS-M6010BOSS302 block .060
Eagle crank
Lunati rods
Mahle flattop pistons, file fit rings
Comp cams 35-518-8 Extreme Energy cam 0 deg ret.
Heads port/polish double springs 1.92/1.60 valves
holley systemax upper/lower intake
1/5/8 long tube headers
30# injectors
150hp shot of nitrous
4:10 rearend
Diablosport CMR custom chip
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Old 05-08-2013, 08:15 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, 09:57 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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347 stroker 10:1 compression
new FMS-M6010BOSS302 block .060
Eagle crank
Lunati rods
Mahle flattop pistons, file fit rings
Comp cams 35-518-8 Extreme Energy cam 0 deg ret.
Heads port/polish double springs 1.92/1.60 valves
holley systemax upper/lower intake
1/5/8 long tube headers
30# injectors
150hp shot of nitrous
4:10 rearend
Diablosport CMR custom chip
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Old 05-08-2013, 10:07 AM   #7
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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, 12:06 PM   #8
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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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347 stroker 10:1 compression
new FMS-M6010BOSS302 block .060
Eagle crank
Lunati rods
Mahle flattop pistons, file fit rings
Comp cams 35-518-8 Extreme Energy cam 0 deg ret.
Heads port/polish double springs 1.92/1.60 valves
holley systemax upper/lower intake
1/5/8 long tube headers
30# injectors
150hp shot of nitrous
4:10 rearend
Diablosport CMR custom chip
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Old 05-08-2013, 12:06 PM
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