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Why does your Air conditioning go from vent to defrost when accelerating?
Wiki User
∙ 12y ago
Mainly because you don't need a fogged up windshield if you are driving fast. Seriously, the defroster setting is where most autos go to if there is a problem with vacuum. If nothing worked in your dash controls, the one thing you would still need would be the defroster, so that is the default setting. Now, when you accelerate fast, the throttle is wide open, and there is no vacuum, or it is very low, so with low vacuum the control reverts back to defrost. It would be the same as if you un hooked a vacuum line and did not feed your dash controls, you would only have defrost.
Wiki User
∙ 12y ago
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Why is your air conditioning fan switching from vent to defrost on acceleration?
You have a leak in the vacuum supply to the ac control.
AC vents blowing through Defrost and bottom vents 05 crown vic?
2003 crown vic air conditioning vent dont blow
How do you fix the air conditioning if it only blows through the defrost and floor and not the vent in a 89 Chevy S10?
Check under the hood for a broken or disconnected vacuum line.
Why do most air conditioning systems not need a defrost system?
Dont no
How do i clean the airconditioning on a 1998 Daewoo lanos?
You can clean the air conditioning by vacuuming out the air conditioning vents. You can also clean the air conditioning condenser vent screen.
What causes the air to stop blowing out of dash vent when accelerating?
you have a vacuum leak
2001 ford ranger air conditioning will only come out of the defrost Is the switch bad for the vent control can you make the vent open manuelly?
Check for a vacuum leak either under hood or under dash Check the operation of the vacuum controlled motors under dash Check the operation of the selector switch Defrost is the default position for this system
Why do most air conditioning system do not need a defrost system?
Because most air conditioning systems operate at a temperature above the freezing point of water.
Why do most air-conditioning system do not need a defrost system?
Because most air conditioning systems operate at a temperature above the freezing point of water.
When accelerating or engine under load of 2002 f-250 ac air from dash vents moves to defrosters then to floor while cruising it works fine any ideas?
you have a vaccumm leak defrost is the normal at rest vent setting
If you run the bathroom air vent will it help cool your house or waste the air conditioning?
it is going to waste air conditioning it akes air you cooled and puts out of the conditioned space
Why would the air conditioning only blow air from the defrost and floor vents and not the dash vents?
I would think that is a vacuum or a linkage problem with the heater control assembly (where all the buttons/slides are for changing between floor/defrost/vent) Had a diaphragm go bad on one once, and in a jeep cherokee, a slight collision with a guard rail knocked a vac line off for the vent controls, and ac only worked from defroster.
