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Why going down the road to see air conditioner blow out of the defrost vents on the windshield on a 1992 Plymouth Sundance 2.5 engine

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Vacuum line to the heater controll box has a leak or is disconnected.

Or the controlls went bad.

Posted on Sep 27, 2015


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Posted on Jan 02, 2017

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SOURCE: Heat wont blow through heater or defroster vents

common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

Posted on Feb 23, 2009

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SOURCE: Air stopped blowing through vents, only blows through defroster

Make sure all your vacuum hoses are connected on the engine side. There is a vacuum ball mounted close to or on the fender wall. Make sure that the hose is connected to the vacuum ball. Question: Has the engine started to run rough lately? And do you hear a hissing sound or whistle from the dash area?

Posted on Aug 17, 2009

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SOURCE: Cold Air Not Blowing Through Vents

Your last guess is probably the right one. The deflectors/directors are vacuum controlled and you may have vacuum line either broken or disconnected; these aren't fun to find. I would start under the hood and make sure the vacuum reservoir is intact (have seen them cracked) and then start tracing hoses from there.

Posted on Aug 18, 2009

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SOURCE: In my 1996 Buick Park Avenue the air conditioner


Posted on Aug 19, 2009

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SOURCE: air conditioner will only blow air out the

Defrost is the default when the controller is not receiving vacuum from the intake manifold. Look for the small vacuum line going from the engine intake manifold to the firewall and trace it to the control switch. If the vacuum line looks OK, try to pull the vacuum connection from the control switch. Then start the car and see if there is vacuum coming to the connector from the line that you traced from the engine. If no vacuum, the line has a leak--retrace to the manifold. If there is vacuum, your switch is probably leaking. You can buy a new vacuum switch from Ford or some parts stores. More questions, please let me know.

Posted on Sep 09, 2010

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2 Answers

The air conditioner is blowing from the windshield studded vent

You have a loss of vacuum from the engine or the vacuum switch located in the mode control in the dash is defective or leaking or disconnected, pull the heater/AC control out and see if you have vacuum at the switch. The reason it only blows at the defrost vents is that the system is designed to "default" to defrost if vacuum is lost to the heater control mode switch.

Apr 07, 2017 | Cars & Trucks

1 Answer

What operates the doors for the air conditioner and heater controls in a 1992 Plymouth Sundance 2.5 engine
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Windshield defrost

Can you feel (with your hand) a difference in the air pressure blowing in the driver's side windshield vent and the passenger's side vent? If so, I'd bet that something has fallen down the defroster vent and is partially blocking the channel on the driver's side. You could try taking a length of fairly stiff wire or a straightened wire coat hanger and sliding it down the driver's side defroster vent to see if you can dislodge whatever is down there, but you can't get the obstruction completely out that way. Removing the defroster ducting is not a simple task, but an experienced auto technician can do it (parts of the dash board have to be removed along with (possibly) the radio and anything else in the center portion of the dash. Good luck.

Oct 10, 2013 | Ford Mustang Cars & Trucks

1 Answer

1999 durango vent control switch will not let AC blow threw vents only defrost

Usually this is a problem with the blend doors under the dash. You either have a vac leak, a dead motor, or a faulty door.
The control opens and closes the doors to direct air thru the heater core and evaporator core along with directing air thru the vents.
When a problem occurs, the default position is the defrost vents to make sure the windshield remains clear.
You can do an internet search for "repair durango blend door" for more info.

Jul 29, 2012 | 1999 Dodge Durango

1 Answer

Air conditioner blows out defrost vents when acceleration.

In f150 truck there is a small vacum hose passenger side up by the windshield. It's a small hose check really good they dry rot and it will cause your vents to switch. Also if your box is bad. It's next to the battery

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front of the engine see picture below.


Mar 09, 2010 | 1992 Plymouth Sundance

1 Answer

Drivers side windshield wiper not moving

The bolt that holds the wiper on is loose. There is a little plastic cap at the other end of the wiper arm, the side away from the wiper blade. Remove the cap and tighten the bolt. That should get it going again.

Jan 21, 2010 | 1992 Plymouth Sundance

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