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2002 s10 blows air out vents no matter what position its in

No matter what position you put the air controller in it always has air coming out the front vents. i took the dash panel off at the bottom vents and i can see the diaphram on the drivers side cycle when i turn it different positions.is there another diaphagm that controls the shut of to the vents ?

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I have had same problem, the vacuum lines by the square vacuum canister in the driver fender, next to the brake booster all appear to be intact, the vacuum lines behind the glove box are securely fastened at the junction, and the engine bays vacuum lines are all secure, still have yet to diagnose, I have heard however that if yours is 4wd and have had problems with the actuator it is possible that transmission fluid has been sucked into the a/c vacuum lines and creating a blockage for vacuum. Since these vacuum lines are supplied by the same stem, I find that this will be the next step in my progress, manually checking for vacuum at the cabin.

Posted on Feb 20, 2013

  • Marty Dummitt
    Marty Dummitt Feb 20, 2013

    Found the problem to these symptoms, if air is coming out all vents, not just the defrost, no matter what setting; then the problem is a vacuum actuator under the the panel in the driver floor boards. It is located to the right of the gas pedal, and there are two of them, its the one closest to the firewall, it actuates the door that closes off the vents flow. the seal most likely has gone bad, as mine did and no longer closes that door, leaving all vents open no matter what position.

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alicantecoli
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SOURCE: passenger side blows hot air when front control set to Air

you cant adjust it ,this requires the dealers computer to re set it,or a phyiscal control has packed up like a vacumn pipe has split where it pushes onto the valve that controls the flap in the heater unit.

Posted on Apr 26, 2009

johnjohn2
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SOURCE: 2005 ford explorer that has no heater control

the next thing to check would be the selector motors, these motors are what move door to get floor or defrost or vent air and also hot/cold air, look under the dash try to find them, there bolted to heater box,there are 3, locate one by one then move every control and watch to see linkage move find the one that doesnt move and thats your problem, hope this helps.heres a picture to help you know what it looks like.7d37251.gif

Posted on Jan 20, 2010

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SOURCE: 2004 Chevrolet Silverado vent control

sounds like the vacum lines thats hooked up to it is disconnected check that first

Posted on Oct 30, 2008

blueextc3221
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SOURCE: 1986 VW Golf heater blows cold air

The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.
if the car is not overheating, the thermostat is working fine.... replace or flush the heater core multiple times to try and eliminate sediment build-up.

Posted on Jan 14, 2009

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SOURCE: 2001 Jeep Cherokee a/c blows defroster only, no cruise control

There is a vacuum leak under the hood somewhere. Check the vacuum at the speed control servo. If there is no vacuum on the line with the engine running, follow the line to find the leak. The vacuum reservoir is mounted under the battery tray. I would look in that area after confirming no vacuum at the servo.

Posted on Apr 27, 2009

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