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1998 Mustang - AC blows only through Defrost vents

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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philriden
  • 146 Answers

SOURCE: 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.

Posted on Jan 05, 2009

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VWdan
  • 114 Answers

SOURCE: ac will not blow thru ac vents, only thru defrost vents.

if vent doors are operated by vacuum check for loose or broken vacuum hoses in the engine compartment , or check the fuse box for any ac/heat fuses if it is a electricaly controoled system

Posted on May 04, 2009

  • 1 Answer

SOURCE: ac only blows through defrost vents

I just found my problem that often brings in a Check Engine light, and reads out a PO 442 code. When my A/C is on my heater would start working because a vacuum operated control door would slam shut when accelerating. Also my cruise control would stop when going up a large incline.

the first thing to check, and easy is the cruise control for a bladder leak. Look on the top side passenger side of the firewall, and you will find a three way vacuum hose connection. One will be a very small black plastic line that runs to the cruise vacuum actuator. Pull this hose loose at the fire wall connection. Blow in this hose, and if it will not hold pressure, and in my case I could hear air passing through it is defective needing replacement. Block off the firewall connection for A temporary fix.

Posted on May 08, 2009

  • 279 Answers

SOURCE: AC blows through defrost and floor vents instead of ac vents

You have a vacuum leak in the system that controls the vent doors. First check for cracks at the vacuum reservoir, then check the various vacuum hoses and vacuum motors for a leak.
Charlie

Posted on Jun 19, 2009

  • 708 Answers

SOURCE: ac blows out of defrost vents only

it is your blend door not opening properly.

Posted on Oct 05, 2009

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MY 2005 FORD MUSTANG V-6 THE AC ONLY BLOWS THRU THE DEFROST VENTS ?


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    My 1995 ford mustang is blowing air out of the defrost vents instead of the ac vents


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    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

    1 Answer

    AC.


    Inspect all of the vacuum lines in the AC system under the hood. If one of these lines is cracked or broken the AC system will not be able to switch the vents over.

    Aug 30, 2008 | 1998 Ford Mustang

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