A/c Problems

roquecampos · July 24th, 2009, 12:26 PM

The a/c in my 97 v6 only comes out of the defrost vents. I changed the function selector switch, still doing the same.

Trick Tuners · July 24th, 2009, 01:31 PM

I think these are vacuum powered. check the vac line that comes thru the firewall to make sure its connected to the vacuum system. If it is, and has vacuum (you can 'suck" on the hose if you don't have a gauge to make sure its pulling vacuum) then pull the AC knob thing and make sure its connected and getting vacuum to the back of it. I'm not 100% on the mustang ac operation, but my jeep did the exact same thing and it was a cracked fitting near the engine that leaked my vacuum signal.

97S281 · July 24th, 2009, 05:48 PM

Shrink tubing is all you need to jimmy that up.There is a small vacume line on your upper plenum between your IAC and your TB position sensor. This vacume line controls the levers in your vent system. When one of them breaks it will only work on defrost. I have posted some pics for you. The lines are red, and on one of the pics you can see the white shrink tubing covering mine where it was cracked.

C MY 4D · July 24th, 2009, 05:55 PM

Originally Posted by Trick Tuners

I think these are vacuum powered. check the vac line that comes thru the firewall to make sure its connected to the vacuum system. If it is, and has vacuum (you can 'suck" on the hose if you don't have a gauge to make sure its pulling vacuum) then pull the AC knob thing and make sure its connected and getting vacuum to the back of it. I'm not 100% on the mustang ac operation, but my jeep did the exact same thing and it was a cracked fitting near the engine that leaked my vacuum signal.

what he said....

97S281 · July 24th, 2009, 06:03 PM

I see that was your first post, btw.

Welcome to the forums.

kiko · August 17th, 2010, 04:48 AM

Hi, I just face to this problem today.
Do you still have those reference pictures?

Thanks in advance!

Originally Posted by 97S281

Shrink tubing is all you need to jimmy that up.There is a small vacume line on your upper plenum between your IAC and your TB position sensor. This vacume line controls the levers in your vent system. When one of them breaks it will only work on defrost. I have posted some pics for you. The lines are red, and on one of the pics you can see the white shrink tubing covering mine where it was cracked.

97S281 · August 17th, 2010, 08:11 PM

replaced my intake manifold broke some vacuum lines help?

There is a pic already posted in the above thread, Check it out and maybe it will help you out.

kiko · August 19th, 2010, 07:11 AM

Thanks for the link, 97S281.
I'll check my cable tomorrow. Hope it won't be too bad so can handle by newbie like me!

July 24th, 2009, 12:26 PM	#1
roquecampos Newbie Join Date: Jul 2009 Posts: 2 iTrader: 0 reviews	A/c Problems The a/c in my 97 v6 only comes out of the defrost vents. I changed the function selector switch, still doing the same.

July 24th, 2009, 01:31 PM	#2
Trick Tuners MM Fanatic KB'd GT Join Date: Nov 2006 Location: San Diego Posts: 4,467 iTrader: 3 reviews	I think these are vacuum powered. check the vac line that comes thru the firewall to make sure its connected to the vacuum system. If it is, and has vacuum (you can 'suck" on the hose if you don't have a gauge to make sure its pulling vacuum) then pull the AC knob thing and make sure its connected and getting vacuum to the back of it. I'm not 100% on the mustang ac operation, but my jeep did the exact same thing and it was a cracked fitting near the engine that leaked my vacuum signal. __________________ Check out my forums for stuff on troubleshooting, tuning, etc We teamed up with Socal Performance Racing to bring dyno tuning to San Diego. Be friends with us on FB

July 24th, 2009, 05:48 PM	#3
97S281 Rollin' 18/ pushin' 2 1997 Saleen S281 Join Date: Feb 2007 Location: The lost highway Posts: 6,673 iTrader: 13 reviews	Shrink tubing is all you need to jimmy that up.There is a small vacume line on your upper plenum between your IAC and your TB position sensor. This vacume line controls the levers in your vent system. When one of them breaks it will only work on defrost. I have posted some pics for you. The lines are red, and on one of the pics you can see the white shrink tubing covering mine where it was cracked. Attached Thumbnails __________________ MODS IN GARAGE NCMM ORIGINAL BLOWN 96-98 CREW MEMBER # 1

July 24th, 2009, 06:03 PM	#5
97S281 Rollin' 18/ pushin' 2 1997 Saleen S281 Join Date: Feb 2007 Location: The lost highway Posts: 6,673 iTrader: 13 reviews	I see that was your first post, btw. Welcome to the forums. __________________ MODS IN GARAGE NCMM ORIGINAL BLOWN 96-98 CREW MEMBER # 1

August 17th, 2010, 08:11 PM	#7
97S281 Rollin' 18/ pushin' 2 1997 Saleen S281 Join Date: Feb 2007 Location: The lost highway Posts: 6,673 iTrader: 13 reviews	replaced my intake manifold broke some vacuum lines help? There is a pic already posted in the above thread, Check it out and maybe it will help you out. __________________ MODS IN GARAGE NCMM ORIGINAL BLOWN 96-98 CREW MEMBER # 1

August 19th, 2010, 07:11 AM	#8
kiko Newbie Join Date: Aug 2010 Posts: 2 iTrader: 0 reviews	Thanks for the link, 97S281. I'll check my cable tomorrow. Hope it won't be too bad so can handle by newbie like me!

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