Question about 1994 Ford Mustang

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Air condition vacuum not working air condition stuck on defrost on my 94 ford mustang 5.0 engine

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  • jrgebhardt Aug 02, 2008

    I have the same problem, I was told that the vacuum supply hose for the climate contol panel is disconnected or broken. I'm not sure how to get to that, I CAN NOT GET THE COVER OFF THE CONTROL PANEL TO CHECK IT OUT

  • Broken horse Aug 04, 2008

    I have a 1996 Ford Mustang 6cyl. and have the same problem with the air coming out of the defrost selection of the control panel. Let me know if you have found the solution to your problem?

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I had the same problem. There was a broken vacuum hose on the firewall. I just pulled out the broken piece and slid it back together. Free and easy fix. I waited a year to do it though. Didn't know it'd be that easy.

Posted on Aug 09, 2008

Check for vacum leak going to firewall thats usually whear you find the problem

Posted on Aug 03, 2008

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2 Answers

On my 2005 Ford Taurus the air conditioning is coming out the defrost vents.


There is a flapper or trap door in the dash board that diverts air flow to various vents, defrost, floor, face, etc. If that stops working it will get stuck in the default position which is usually the defrost vents.

If you have a vacuum operated system you can check the vacuum hose for the system in the engine compartment for integrity. If that is ok then you have to get to the vacuum switch in the dashboard and probably replace it due to leaking vacuum - labor intensive and not cheap.

Any time the dashboard has to be removed you are in trouble money wise.

Aug 31, 2015 | Ford Cars & Trucks

1 Answer

2001 Ford Mustang Cobra air conditioning problem


most fords were built to whenever the air is on to blow air onto the windows as well. most people dont notice it cause its only a partial air. if it is blowing out pretty hard then the most likely cause of that is that the little flap in your air ducting is stuck or the return spring on it has gone bad. hope i helped, good luck with the fix.

Nov 07, 2009 | 2001 Ford Mustang

1 Answer

Just blowing air out of defrost vents


vacuum supply problem to the HVAC controls. check the vacuum hose leading from the engine to the passenger compartment.

Oct 02, 2009 | 1995 Ford Mustang

2 Answers

95 mustang Still tring to get air to blow out vents will only blow hot air out the defrost holes... no matter if i put it on vent or AC or heat its the same temp and it comes from the defrost holes Some...


check the vacuum lines in the selector switch. the baffles that switch from hot air and cool air are vacuum controlled and if the lines are detached or cracked the suction will not move the baffles.

Jun 18, 2009 | 1995 Ford Mustang

2 Answers

My 95 Ford Mustang will only blow air out the defrost holes it will not blow out the vent or the floor what seems to be the problem ?


check for a vacuum leak from the vacuum source on the engine to the heater control head.


defrost is fail safe mode.

A/C Vacuum Reservoir Tank and Bracket Removal and Installation
  1. Open the glove compartment (06010) .
  1. Working through the glove compartment , remove the vacuum reservoir retaining screw.
  1. Remove two vacuum hose tubes from the check valve and remove the A/C vacuum reservoir tank and bracket (19A566) .
  1. To install, reverse Removal procedure.

    A/C Vacuum Reservoir Tank and Bracket


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Jun 06, 2009 | 1995 Ford Mustang

1 Answer

97 mustang air conditioning


You have a vacuum leak,defrost is the default postion(no vacuum).Look under the hood on the passenger side at the firewall and find the small black vacuum line that goes inside the car.Trace this line back, you will find it goes to a black canister(which is the reserve supply) then it will leave this and go to a vacuum port on the intake manifold.You will most likely find a leak somewhere in theis line.

Feb 05, 2009 | 1994 Ford Mustang

1 Answer

1998 Mustang - AC blows only through Defrost vents


You probably have a vacuum leak on the passenger side. its a small plastic hose some times they come unpluged from the engine. or brake.

Jan 05, 2009 | 1998 Ford Mustang

2 Answers

97 mustang air conditioning


Many auto cooling/heating systems use a "blend door" which mixes both hot and cold air to provide air at the temperature selected with the temperature control. When the temp control is in the full cold position, the blend door moves to a position which allows only cold air to pass into the cabin/passenger compartment.
That blend door is generally operated with engine primary [unmodified intake manifold pressure] vacuum. IF there is a leak in the primary vacuum line system, then at low engine RPM the leak may bleed off the vacuum necessary to hold the door in the cooling position. Then when driving, the vacuum will be much higher, "over riding" the leak, and allow the vacuum motor, which operates the blend door, to hold the door in the proper position and provide only cold air to the cabin/passenger compartment.

Jun 23, 2008 | 1998 Ford Mustang

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