A/C Problem - Electric or Vacuum?

jammmm · 07-17-2006, 08:59 PM

My A/C is cold....but my switch to turn it from off to vent to A/C to Heat, etc. will only blow out of the Defrost and floor.

Okay....my center dash is out and the glove compartment is off. I can't find a vacuum leak anywhere. I've been told it may be an electric motor which switches the doors from vent to defrost. I really don't know.

Any suggestions? If it is a motor....where is it?

Thanks in advance for your help!

grey88gt · 07-18-2006, 10:26 PM

I had a vac line broken buy the fire wall on the passenger side, causing the same problem.

tmoss · 07-19-2006, 12:23 PM

http://forums.mustangworks.com/attac...achmentid=5074

The vacuum lines from thje engine compartment can be broken, or if you've had your control panel out, the yeelow vacuum line can get pulled off the vacuum motor that changes the air from the winshield/floor to the dash vents.

jammmm · 07-20-2006, 12:00 AM

Okay.....Number 1 I did find the vacuum line inside the engine compartment. As luck, (or perhaps unluck), would have it, the line was broken in two. Unluck you say?? Well, I repaired the line and hooked it back up. Turned on the A/C and the air is still blowing out of the defrost and floor.

I did check the "yellow" line. It is in tact and connected properly.

What's next??

(By the way I followed the line from the engine compartment through the firewall and the line is in tact all the way.)

Need help...the 100+ degree days may shorten my life......(Not because I can't take the heat.....but because my wife may KILL me if I don't get the A/C working in more than one car!!)

Thanks again....in advance.

tmoss · 07-20-2006, 07:27 AM

you still have a vacuum problem somewhere in the line. That or the vaccum motor up there under the dash behind the control panel has a split vacuum diagphram, but that would be very rare. Remove the dash control panel and see if you have vacuum going to the vacuum motor's yellow line by pulling it off the control switch and put your finger or a vacuum guage on the nipple to see if it;s getting vacuum. If not, work back toward the engine caompartment from there.

07-17-2006, 08:59 PM	#1
jammmm Registered Member Join Date: May 2006 Posts: 3	A/C Problem - Electric or Vacuum? My A/C is cold....but my switch to turn it from off to vent to A/C to Heat, etc. will only blow out of the Defrost and floor. Okay....my center dash is out and the glove compartment is off. I can't find a vacuum leak anywhere. I've been told it may be an electric motor which switches the doors from vent to defrost. I really don't know. Any suggestions? If it is a motor....where is it? Thanks in advance for your help!

07-18-2006, 10:26 PM	#2
grey88gt Registered Member Join Date: Feb 2004 Location: Skiatook, Oklahoma Posts: 193	Re: A/C Problem - Electric or Vacuum? I had a vac line broken buy the fire wall on the passenger side, causing the same problem.

07-19-2006, 12:23 PM	#3
tmoss Registered Member Join Date: Mar 2003 Location: Saint Louis, MO Posts: 634	Re: A/C Problem - Electric or Vacuum? http://forums.mustangworks.com/attac...achmentid=5074 The vacuum lines from thje engine compartment can be broken, or if you've had your control panel out, the yeelow vacuum line can get pulled off the vacuum motor that changes the air from the winshield/floor to the dash vents. __________________ Tom (Torque) Moss 88Gt 5spd Vert, FLowmaster Catbacks, stock cam advanced 4° @ 108.5° ICL, NMRA prepped GT40P heads 1.85/1.55 valves and 1.7 rockers, MAC P headers Jet-Hot coated, 97 Exlporer intake (ported lower), TB and injectors. 277RWHP/330RWTQ (SAE). http://www.fastlanecars.com/

07-20-2006, 12:00 AM	#4
jammmm Registered Member Join Date: May 2006 Posts: 3	Re: A/C Problem - Electric or Vacuum? Okay.....Number 1 I did find the vacuum line inside the engine compartment. As luck, (or perhaps unluck), would have it, the line was broken in two. Unluck you say?? Well, I repaired the line and hooked it back up. Turned on the A/C and the air is still blowing out of the defrost and floor. I did check the "yellow" line. It is in tact and connected properly. What's next?? (By the way I followed the line from the engine compartment through the firewall and the line is in tact all the way.) Need help...the 100+ degree days may shorten my life......(Not because I can't take the heat.....but because my wife may KILL me if I don't get the A/C working in more than one car!!) Thanks again....in advance.

07-20-2006, 07:27 AM	#5
tmoss Registered Member Join Date: Mar 2003 Location: Saint Louis, MO Posts: 634	Re: A/C Problem - Electric or Vacuum? you still have a vacuum problem somewhere in the line. That or the vaccum motor up there under the dash behind the control panel has a split vacuum diagphram, but that would be very rare. Remove the dash control panel and see if you have vacuum going to the vacuum motor's yellow line by pulling it off the control switch and put your finger or a vacuum guage on the nipple to see if it;s getting vacuum. If not, work back toward the engine caompartment from there. __________________ Tom (Torque) Moss 88Gt 5spd Vert, FLowmaster Catbacks, stock cam advanced 4° @ 108.5° ICL, NMRA prepped GT40P heads 1.85/1.55 valves and 1.7 rockers, MAC P headers Jet-Hot coated, 97 Exlporer intake (ported lower), TB and injectors. 277RWHP/330RWTQ (SAE). http://www.fastlanecars.com/

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