heater controls?

psycho bob · October 12th, 2009, 02:56 PM

so it's been a bit cold lately and i have no heat coming out of the floor vents nor will air come out of the "face" vents. the only thing that works is the vents when the a/c is on and every other setting comes out of the defrost. i'm sure this is a pretty common issue. so anyone with the fix???

mxnate116 · October 12th, 2009, 03:56 PM

are all your vacuum lines connected under the dash?

psycho bob · October 12th, 2009, 05:54 PM

i could double check, but i bought it from the original owner and they haven't done anything to it. totally stock

nolife · October 12th, 2009, 08:21 PM

See this thread. It is not very detailed but should get you started, the flapper is vacuum operated and supplied from the vac tree on the firewall. Follow it from there to the flapper under the dash and to the control knob in the dash. Most issues seem to be a cracked hard plastic vac line in the engine compartment.
Fans don't work correctly

83 5.0 · October 12th, 2009, 11:03 PM

Some diagrams here that may help in your troubleshooting Mustang FAQ - Engine Information

tmoss · October 14th, 2009, 11:11 AM

try this.....

psycho bob · October 18th, 2009, 03:53 PM

so started looking yesterday and found a Y with only the two lines that go back under the dash connected. the one that looks like it goes into the engine compartment has no tube on it at all.

tmoss · October 18th, 2009, 04:03 PM

might be your problem.......

October 12th, 2009, 02:56 PM	#1
psycho bob MM Fanatic 07 GT/86 LX 5.0 12.86@104 Join Date: Aug 2006 Location: colorado springs, co/ Tulsa, OK Posts: 3,636	heater controls? so it's been a bit cold lately and i have no heat coming out of the floor vents nor will air come out of the "face" vents. the only thing that works is the vents when the a/c is on and every other setting comes out of the defrost. i'm sure this is a pretty common issue. so anyone with the fix??? __________________ I just wanna go fast and I finally got to install my parts.....H&C ftw

October 12th, 2009, 03:56 PM	#2
mxnate116 Enthusiast 88 mustang GT Join Date: Jun 2007 Location: Spokane, WA Posts: 751	are all your vacuum lines connected under the dash? __________________

October 12th, 2009, 05:54 PM	#3
psycho bob MM Fanatic 07 GT/86 LX 5.0 12.86@104 Join Date: Aug 2006 Location: colorado springs, co/ Tulsa, OK Posts: 3,636	i could double check, but i bought it from the original owner and they haven't done anything to it. totally stock __________________ I just wanna go fast and I finally got to install my parts.....H&C ftw

October 12th, 2009, 08:21 PM	#4
nolife Hardcore Enthusiast 91GT, 88GT, 02GT Join Date: Dec 2006 Posts: 1,723	See this thread. It is not very detailed but should get you started, the flapper is vacuum operated and supplied from the vac tree on the firewall. Follow it from there to the flapper under the dash and to the control knob in the dash. Most issues seem to be a cracked hard plastic vac line in the engine compartment. Fans don't work correctly __________________ Looking for a decent 90-92 Titanium hatch pull cover and retaining clips Last edited by nolife : October 12th, 2009 at 08:33 PM.

October 14th, 2009, 11:11 AM	#6
tmoss Regular Join Date: Jan 2007 Location: St Louis, Mo Posts: 209	try this..... Attached Thumbnails __________________ 88 GT Vert 5spd, 3:73 gears, Explorer intake/65mm TB, Explorer Ps, Manley race 1.85/1.55 valves, 1.7/1.6 stud rockers, stock cam +4 degrees, MAC Jet-Hot coated shorties. 277RWHP/330RWTQ NEW ride 2008 GT500KR #258

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October 12th, 2009, 11:03 PM	#5
83 5.0 Regular Join Date: Aug 2006 Location: Toronto Ont. Canada Posts: 255	Some diagrams here that may help in your troubleshooting Mustang FAQ - Engine Information

October 18th, 2009, 03:53 PM	#7
psycho bob MM Fanatic 07 GT/86 LX 5.0 12.86@104 Join Date: Aug 2006 Location: colorado springs, co/ Tulsa, OK Posts: 3,636	so started looking yesterday and found a Y with only the two lines that go back under the dash connected. the one that looks like it goes into the engine compartment has no tube on it at all. __________________ I just wanna go fast and I finally got to install my parts.....H&C ftw

October 18th, 2009, 04:03 PM	#8
tmoss Regular Join Date: Jan 2007 Location: St Louis, Mo Posts: 209	might be your problem....... __________________ 88 GT Vert 5spd, 3:73 gears, Explorer intake/65mm TB, Explorer Ps, Manley race 1.85/1.55 valves, 1.7/1.6 stud rockers, stock cam +4 degrees, MAC Jet-Hot coated shorties. 277RWHP/330RWTQ NEW ride 2008 GT500KR #258

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