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If you included the kind of car you have,I could be more specific but all cars have a vacuum canister under the hood. some are round plastic and some are a tin can and most are black. There shuold be a vacuum line going from the intake to one end and a vacuum line out of the other that supplies vacuum to the interior of the car, There should be a one way valve in the canister or the line from the intake. This valve is not functioning and loosing vacuum in the resirvoir. If it is in the resirvoir which most are, replace the resirvoir.
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Ac is blowing from all vents except front vents?
yes
Why all of a sudden is there the sound and feel of air blowing out of my vents MORE when i accelerate?
Sounds like vents are in open position where it passes through based on speed with or without fan on
Why does the air stop blowing out of vents when you step on the gas to increase speed?
A/C and Heater duct controls are often operated by vacuum chambers with spring return, under acceleration...wide open throttle...manifold vacuum goes to zero!
Why is the downstairs vents not blowing on central ac but the upstairs vents are?
I have the same problem, and looking for answers. Please help!
Why is your car blowing steam out of your vents?
The heater core is leaking coolant.
Why is your ac blowing out of dash vents?
Your AC might be blowing out of dash vents on the windscreen as you might have turned the knob to that particular mode. It is also possible that the vent mechanism might be out of order or broken.
On a1996 corvette what causes the AC air to blow out of the defroster and floor vents for about 30 minutes before blowing out of the dash vents?
== ==
Why would the blower fan stop blowing air from the vents if the fan speed is not set on high on a 91 town car?
Low speed relay bad Blower fan resistor Defective winding in blower motor
Your central air conditioner turns on but is not blowing through the vents?
If central air conditioner turns on but is not blowing through the vents, check the filter. If it is dirty, change it. Change the thermostat into cool, this will defrost the air conditioner.
Your outside unit is not running and the vents are blowing warm air?
Call someone to repair the outdoor unit and the vents will blow cool air.
What is wrong if the vents are only blowing hot air?
you may just be low on freon
Why would the vents in a dodge avenger be blowing dust?
your cabin filter might be dirty
