Question about 1990 Cadillac SeVille

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Blower good, air flow comes out bottom and not out upper vents, also air flow will not come out defrost vent gerald

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Vacuum or acuator motor is the culpret,look under hood and make sure vacuums all conected and vacuum going threw them, parts store will know if there is an acuator motor for that year/check for a vacuum resorvior .round like a ball or made like a can it may have vacuum off of it or it may have a hole in it

Posted on Jun 30, 2009

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My windows are not defrosting properly.


Do you have heat? Does the fan turn on? are you getting air from the defroster vents close to the windshield? If you have heat make sure the defrost control is working. I'd open the outside air vent and turn the blower on high speed. If there is no heat, the heater control valve is not working. Double check the radiator fluid tank, make sure you have enough fluid (antifreeze) Low fluid levels can reduce the hot water flow to the heater coil inside the car. If there
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Why is hvac air coming from all three locations (vent/floor/defrost) regardless of switch setting?


Check air box if it won't change air flow some thing is wrong there inside the car

Jul 14, 2014 | 2000 Buick Regal LS

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Heater and Defroster not blowing air


check vent flaps inside the blower unit....

Nov 24, 2013 | 1996 Mitsubishi Mirage

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2000 jeep grand cherokee, only blow out a little air even when the blower on hi,,you have to put your hand next to the vent to feel the air


you may have had something fall down into the defrost vent and it has worked its way down and is blocking the air flow thats trying to come out the vents,near the blower motor.also does it sound like the blower motor is spinning on high speed or at a lower speed,you could have a slow turning blower motor.

Jul 20, 2011 | 2000 Jeep Grand Cherokee

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REPLACED BLOWER MOTOR CONTROL MODULE...Now blower is working but not very much air flowing out of vents! Fan speed is working...it heat and cools. but still not adequate air flow from the vents ..2000...


check your blower hoses to see if one or more have come loose or got redirected or the selector switch isn't functioning properly (is it blowing better on defrost as opposed to floor vents, or forward vents, etc.)
Good luck

Oct 26, 2010 | 2000 Jeep Grand Cherokee

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2005 Silverado 2500HD 4WD - It appears that the pneumatic valve controlling the directional air flow from my heater/AC is getting stuck. When I switch the fan to front window defrost then back to...


The default configuration when all vacuum fails is to defrost vents. Most likely your vacuum supply to the switch is weak. Check the connection of the supply line to the intake manifold for damage. If no problem there, trace it to the switch on the control panel. If there is an accumulator, make sure it isn't leaking and is storing vacuum. If all this is good, look at any other vacuum lines connected to the intake manifold that may be leaking and possibly reducing the vacuum supply to the HVAC control line. Let me know if you have more questions.

Sep 28, 2010 | 2006 Chevrolet Silverado 2500HD 2WD

1 Answer

Blower air just through defroster vents, not front vents


The problem is that the plastic lines that the air flows through get frail and cracks and breaks.What happens is when the hose breaks you loose vacuum and the system reverts to defrost mode.You should be able to see it from under the hood on the passengers side.You will have to find the area that is broken and then go to the parts store and get some rubber hose that will fit over the plastic hose.Take a piece of the plastic hose with you so you can get the right size hose to fit over it.This just happened to my 97 Astro van.I found the broken hose and repaired it with the rubber line and is working normal now.Hope this helps.Let me know what you find out.Good luck.

Jul 20, 2010 | 1997 Chevrolet Astro

1 Answer

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.

Jan 18, 2009 | 1997 Chevrolet K1500

1 Answer

No air flow from defrost vent on my van.


Could be a vaccum line leaking not changing the vent flap to defrost

Jan 10, 2009 | 2001 Oldsmobile Silhouette

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