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1998 windstar only blowing air out of defrost

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Check under hood on passenger side. There are two hard plastic black vacuum lines that go to a ball (vacuum chamber). Trace them to the engine. Chances are one of them are broken. They are HVAC vent control vacuum lines. Usually when they break you're left with this symptom. Happy holidays.

Posted on Dec 25, 2013

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Posted on Jan 02, 2017

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

chuck943
  • 783 Answers

SOURCE: Vent control

You have a vacuum leak.Defrost is the default postion(no vacuum).
See if you can locate the small black vacuum line that goes inside the vehicle on the passenger side near the heater core. The trace it back,should see it going to a canister then to the intake manifold.Make sure it is not disconnected or broken somewhere.

Posted on Mar 02, 2009

jturcotte
  • 7779 Answers

SOURCE: all air blows out defrost vents only. 1998 ford

Fixed one of these recently--it was a "T" in the vacuum line from the engine near the control switch. The "T" branches to a separate switch on the panel. I cut out the old "T" and spliced in a new one.
Your leak may be elsewhere. Typically, it's where the vacuum line connects to the engine intake manifold, where a hase is used to make the connection there. The other typical failure is the control switch itself. You can access the back of the control panel by taking out 4 screws and pulling it forward. Pull the vacuum connector off the switch and start the engine. The black line coming into the connector should have the engine vacuum on it. If no vacuum, check that "T" and the connection to the engine. If you have vacuum to the switch, the switch is probably bad. You can verify by putting the connector back on and listening for a leak in the switch. If I'm not making sense or you're not familiar with vacuum controlled HVAC, please reply with any questions.

Posted on Sep 15, 2010

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1 Answer

1996 ford windstar blowes cold air thru defrost only warm in back


For some reason this question was listed a dozen times within an hour or so.
Usually the problem is a blend door under the dash. The blend doors direct air thru the heater core and the vents.

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I used to have this vehicle. There are a couple of things that can cause this. In my case there was a disconnected vacuum line that caused the air to only blow through the defrost vents. The vacuum hose beneath the passenger side cowl is probably disconnected. It is behind the engine just below the passenger side windsheild wiper.

The other possibility if all of your vents are working and the air is just cold, could be because the heater core bypass valve vacuum hose came off. Check to make sure the heater core hoses have hot coolant flowing through them when the engine is at operating temp and while running.


The last possibility for this vehicle is the actual HVAC panel with your controls on it. This panel has colored vacuumn lines connected to it that like to break off over time. The switches themselves will sometimes leak air preventing it from functioning correctly.


Hopefully this gives you some clues on where to look.

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