90 Mustang GT AC/ vac line question

polmonari · April 24th, 2011, 09:13 PM

Hey Guys,

I'm new to the site and I'm starting off with a question of course. Air does not come out except for my defrost and seems like a hole @ the box on the passenger side. I went under the hood and found 2 lines coming from the tree to the pass side labeled AC. 1 is going into the fender and appears to be hooked into the temp controls. The other one is cut off, just wondering where that is supposed to go and will that fix my problem.

Thanks for your help

ryanw · April 24th, 2011, 09:41 PM

I think the other cut line runs along the fire wall to the passenger side, i think its that one thay makes your system run in defrost all the time

polmonari · April 24th, 2011, 09:54 PM

I think you may have misunderstood me. There is one line coming off the "t". It runs the firewall and then when it gets to the passenger side it splits into 2 lines. 1 goes into the fender well and the other one is cut very short. Wondering where that one is to go?

ryanw · April 24th, 2011, 10:30 PM

Okay.....The one that's cut goes into the fire wall right where your A/C accumulator line are.(The black canister looking thing), If you see that black square rubber pad on the fire wall look at the top right hand corner and you will see a small round hole....that's were the vacuum line goes in to the interior....I hope that helps

polmonari · April 24th, 2011, 10:37 PM

Ok great. Thank you. Do you know where it goes from there?

ryanw · April 24th, 2011, 10:42 PM

No...sorry

gaducker · April 24th, 2011, 11:13 PM

It goes inside to work your vac motors on the blend doors and it runs to the control panel for heat and AC,

polmonari · April 24th, 2011, 11:17 PM

I see a white hose going to the vac canister right behind the glove box. But cant figure out what im missing. I think I really need to see a diagram of the system. Where would I find that?

polmonari · April 28th, 2011, 10:40 PM

Ok, so I am trying to figure out where this vac line is suppose to connect. There are 2 lines under the hood that are labeled AC. One is routed into the fender and the other goes into the firewall.

Once it goes into the firewall where is it suppose to go? Where does it connect to?

FastStang91Lx · April 28th, 2011, 10:44 PM

I believe the vac canister is on that side. It's a round ball that holds/stores vacuum.

polmonari · April 30th, 2011, 09:52 PM

thanks guys,

just found where it went, and what do ya know. I have cold air thru all vents now!

ryanw · April 30th, 2011, 11:13 PM

Originally Posted by polmonari

thanks guys,

just found where it went, and what do ya know. I have cold air thru all vents now!

Right on, I'm glad we could help.

April 24th, 2011, 09:13 PM	#1
polmonari Newbie Join Date: Apr 2011 Posts: 6 iTrader: 0 reviews	90 Mustang GT AC/ vac line question Hey Guys, I'm new to the site and I'm starting off with a question of course. Air does not come out except for my defrost and seems like a hole @ the box on the passenger side. I went under the hood and found 2 lines coming from the tree to the pass side labeled AC. 1 is going into the fender and appears to be hooked into the temp controls. The other one is cut off, just wondering where that is supposed to go and will that fix my problem. Thanks for your help

April 24th, 2011, 09:41 PM	#2
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	I think the other cut line runs along the fire wall to the passenger side, i think its that one thay makes your system run in defrost all the time __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

April 24th, 2011, 10:30 PM	#4
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	Okay.....The one that's cut goes into the fire wall right where your A/C accumulator line are.(The black canister looking thing), If you see that black square rubber pad on the fire wall look at the top right hand corner and you will see a small round hole....that's were the vacuum line goes in to the interior....I hope that helps __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

April 24th, 2011, 10:42 PM	#6
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	No...sorry __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

April 28th, 2011, 10:44 PM	#10
FastStang91Lx I Post Entirely Way Too Much 1991 Mustang LX 5.0 Join Date: Jan 2010 Location: Minnesota Posts: 5,572 iTrader: 2 reviews	I believe the vac canister is on that side. It's a round ball that holds/stores vacuum. __________________ Point made in less than a few hours with minimal response. http://www.moddedmustangs.com/forums...ml#post4465184

April 24th, 2011, 09:54 PM	#3
polmonari Newbie Join Date: Apr 2011 Posts: 6 iTrader: 0 reviews	I think you may have misunderstood me. There is one line coming off the "t". It runs the firewall and then when it gets to the passenger side it splits into 2 lines. 1 goes into the fender well and the other one is cut very short. Wondering where that one is to go?

April 24th, 2011, 10:37 PM	#5
polmonari Newbie Join Date: Apr 2011 Posts: 6 iTrader: 0 reviews	Ok great. Thank you. Do you know where it goes from there?

April 24th, 2011, 11:13 PM	#7
gaducker Newbie Join Date: Aug 2008 Posts: 15 iTrader: 0 reviews	It goes inside to work your vac motors on the blend doors and it runs to the control panel for heat and AC,

April 24th, 2011, 11:17 PM	#8
polmonari Newbie Join Date: Apr 2011 Posts: 6 iTrader: 0 reviews	I see a white hose going to the vac canister right behind the glove box. But cant figure out what im missing. I think I really need to see a diagram of the system. Where would I find that?

April 28th, 2011, 10:40 PM	#9
polmonari Newbie Join Date: Apr 2011 Posts: 6 iTrader: 0 reviews	Ok, so I am trying to figure out where this vac line is suppose to connect. There are 2 lines under the hood that are labeled AC. One is routed into the fender and the other goes into the firewall. Once it goes into the firewall where is it suppose to go? Where does it connect to?

April 30th, 2011, 09:52 PM	#11
polmonari Newbie Join Date: Apr 2011 Posts: 6 iTrader: 0 reviews	thanks guys, just found where it went, and what do ya know. I have cold air thru all vents now!

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