Best Answer

Low vacuum. When you push down on the accelerator, vacuum decreases. Your Blower doors use vacuum to change positions from floor to vent to defrost. Have a vacuum test done on the vehicle. You may have a vacuum leak, or this may be a sign the engine is getting weak.(Low compression, Leaking valves, etc.)

User Avatar

Wiki User

โˆ™ 2005-09-28 02:23:14
This answer is:
User Avatar
Study guides
See all Study Guides
Create a Study Guide

Add your answer:

Earn +20 pts
Q: What causes for the ac air to change from the front vents to the dash defroster vent when you accelerate on a 1993 Ford van?
Write your answer...
Related questions

What causes f350 steering wheel shake when accelerate?

Check tire balance or wheel bearings in front axle

How did the crusades accelerate change in Europe?

It brought about a redistribution of wealth and brought a new class of European to the fore front.

What is the process that causes rain to change to snow?

a cold front

How do you troubleshoot the rear window defroster for a 1989 Toyota 4Runner?

First things first, make sure that the wires are connected at BOTH sides of the rear window for the defroster. There needs to be a path for the burrent to flow, so both need to be connected. If not, you can purcahse kits to re attach them, or if you are handy enough...solder it yourself. If they are connected, push the button that turn the defroster on...if you hear a click or a change in the sound of the engine (like its under load) then the defroster is working, but you have a connection problem between the device up front and the wires on the window. hope that helps

93 ford escort wagon when you turn the defroster on the air blows out the vents instead of on the the top of the dashboard?

Because it's not a defroster button! It's just the symbol for ventilating the air into the car. It shoudln't be called a defroster since defrosting is meant by heating up the coils that you see at the back of the car. I'm pretty no car has wires in the front!

What are traction bars?

They are bars which mount on the rear axle, under the leaf springs of a rwd car or truck. As you accelerate the torque will cause the axle rotate up at the front. The traction bar has a bump stop at the the front that when this happens contacts the front mount of the leaf spring. This contact causes the wheels to be driven into the pavement(more taction).

Why is there no air coming out of the front vents on your 95 cadillac deville but it comes out of the defroster?

ur electronic climate control (ecc) programmer is faulty need to change it and the vaccum harness to the upgraded one. by the way its on the passenger side under the dash.

What is the motto of Front for Change Ukraine?

The motto of Front for Change - Ukraine - is 'Front of the future'.

Which front causes cumulonimbus clouds?

A cold front

Stepping on the gas pedal to accelerate causes a whining noise in the rear of the vehicle. what is wrong?

If it is a rear wheel drive vehicle it is either low oil in the rear end or an axle bearing. On a front wheel drive vehicle it is probably a bearing.

Which type of front usually causes the most violent weather?

A cold front usually causes the most violent weather

How can you accelerate an object?

Increase the force behind it or increase the pull in front of it, increase the rotation or decrease the resistance

What causes the front end to squeak on a Ford Sport Trac?

change the sway bar rubber bushings and sway bar link bushings

What Causes a front?

a front causes rain or a storm along the line where 2 masses meet they push against each other

What type of front must there be for a flood to occur?

A cold front as this causes a lot of rain in a short period of time. A warm front causes light rain for days at a time.

What causes a 1999 Chevrolet Malibu to shake only when brake is applied when in drive?

if you are driving and you go to stop, then that means that the front rotors are warped. if the front rotors are bad, you will feel a pulsation in pedal while applying brakes. change rotors on front.

How do you change a front brake hose?

How do you change front brake hose on a 1997 lincoln

Change a front directional on a xj6 1996?

change a front directional on a xj6 1996

What front causes a blizzard?


How is the throttle used when crossing an obstacle?

accelerate right before hitting the obstacle to lighten the front end of the bike

Why does your grand Cherokee limited make grinding noise when you accelerate?

A worn front wheel bearing could cause a Grand Cherokee Limited to make a grinding noise when you accelerate. There could also be a problem with one of the shafts.

How do you change the front brakes on a 94 rav4?

How do I change the front breaks on my 2002 Toyota RAV4?

When was Front for Change - Ukraine - created?

Front for Change - Ukraine - was created on 2007-06-26.

How can you stop the front windshield from fogging up while driving?

There's a thing called windshield wipers. Try 'em sometime! Use the defroster.

Why would a grocery store put salt down in front of its doors after it has iced outside?

The salt causes a chemical change in the ice changing the melting point of the it and causes it to thaw, preventing customers form slipping over.