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Q: What causes air not to come through your vents?
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What causes cold air to come out of air vents when heater not on?

The heater may not be on - but the fan still blows air through the vents when they're open !


On your 1996 240 Nissan heat will not come through all vents inside?

The heater blower may not be working properly. Without the heater blower working, the air will not come through the vents.


How can routine air vent cleaning save homeowners money?

Routine air vent cleaning saves homeowners money by improving the flow of air through the vent. When vents get clogged, the air has a harder time pushing through the vents, which causes energy bills to rise.


What causes no air to come through the dashboard air vents?

Most likely you damper is not opening or your fan motor is not running Check the fan motor if is running also look for vacuum line leak this may affect the damper


CAN Gnats come out of dirty air vents?

Yes, gnats can come out of dirty air vents. Gnats can actually come from anywhere. They are very pesky creatures.


How do you find out if the vents are open and working?

I'm not sure what vents you are talking about, but usually air vents are known to be working if there is air flowing through them.


What causes steam to blow through the air conditioning and heating vents in a car?

The steam could be coolant from a bad heater core.


What causes steam to come out of air vents in 1999 expediton?

This is caused by a faulty heater core that has corroded and now has a leak. It needs to be replaced.


What causes the front air conditioner on 1999 Lincoln navigator to stop blowing through the ac vents and start blowing through the defrost vents?

When there is a problem in the vent system it defaults to defrost setting. Check the doors & vac supply


What causes the air conditioner on a 2003 Chevy trailblazer to stop blowing through the ac vents and start blowing through floor and defrost vents?

Check for a vacuum leak -sounds like it is starving for vacuum and reverts to the default position


Why does no air come out of the vents?

heater fan broken.


Why won't air come through the vents?

Does air come out at defrost vents? Defrost is the default position. Check for a vacuum leak either under the hood or under the dash Check the operation of the vacuum actuated motors under the dash Check the operation of the selector switch