Question about 1998 Ford Mustang

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Ac no longer throws air through the vents but only on the dash. There's a vaccuum hose but can't find its proper place

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  • 62 Answers

Vacuum leak. post a picture.

Posted on Nov 30, 2013

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Posted on Jan 02, 2017

  • 50 Answers

SOURCE: ac vent problem

the vacuum canister is located under the battery tray on this model truck, however the most common problem are the vacuum lines that run around the battery box. usually the battry will leak acid at some point in time and create holes in the small hard plastic lines. i would remove the battery and check the vacuum lines first.

Posted on Aug 18, 2008

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

  • 4 Answers

SOURCE: Heat and AC vent problem.

most likley you have a vaccume leak somewhere but also the linkage to the door that that directs the air flow may be in a bind. another possability is the hvac controlls. hope this helps

Posted on Jun 08, 2009

  • 139 Answers

SOURCE: cannot get ac air to come out front dash vents

well find your cabin filter its like an airfilter alot of times bbehind the glove box but not always,and change it.or a vent tube could be clogged or come off but mostly likely a clogged cabin filter.

Posted on Jul 29, 2009

  • 33 Answers

SOURCE: Air doesn't come out front vents

look under your hood for any vaccuum leaks. check all rubber hoses under the hood. they should be roughly the size of your pinky.

Posted on Aug 08, 2009

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1 Answer

My ac throws air threw the front vents sometimes


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The most likely cause would be a problem with the vaccuum source. Most vehicles use a vaccuum source from the engine, in order to control the Climate Control mode. The default setting is for the Climate Control is for it to return to the defrost mode when there is no vaccuum. I'll bet that there is a bad vaccuum hose is leaking or has become disconnected.

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Sounds like the vaccuum controls that direct the flow of air from your heat/ac fan might be out. There are small one-way valves that control these functions. they're cheap $1-$5 dollars. These keep the vents working properly. CHeck under the hood near the firewall, look for small little black plastic lines. These lines are joined at places with a small disc shaped device maybe 1/2 thick. These are the valves that might be problematic. Pull one out and see if you can blow air though it. also try to **** air through it. If you can do both, than the part is bad and needs to be replaces.

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1 Answer

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It sounds to me like you may a vaccuum line thats either leaking or detatched. What your hearing is the vaccuum controled vent system that determines where the air(a/c or heat) is directed out, at your windshield, dash vents, floor vents. . etc. Unless you smell exhaust, i wouldn't be concerned. Theres small plastic hoses behind the dash. have a person that knows what they're doing to take the dash apart if you can't do it. check these small lines for fit or cracks.

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