Question about 2005 Nissan Sentra

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The selector knob for the heat and air unit in my Sentra ( the one that directs air from the dash to the floor or defrost) turns but it doesnt change the direction of the air flo

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This is usually caused by the selector switch being bad on the car. You will need to change the switch for it to work again.

Posted on Sep 03, 2010

  • Brenda Adsit
    Brenda Adsit Aug 17, 2015

    My control switch in my car didn't work for 2 years , I was told it was the Aculalator , I had a friend take the dash board apart to find it was a broken plastic piece in the switch , he fixed it with a piece of safety wire !! Now I have defrost and floor heat !!

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Posted on Jan 02, 2017

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Why wont my 2001 ford windstar blow out of vents ? only on defrost?


Air Flow Control
Air flow control is accomplished in the following manner:
  • Primary control is through the function selector knob , mounted on the heater function selector switch, which is part of the heater control .
  • The function selector knob has the following positions: OFF, PANEL, PANEL/FLOOR, FLOOR, FLOOR/DEFROST and DEFROST.
  • The heater function selector switch combines a vacuum selector valve with an internal electrical switch.
  • The vacuum selector valve directs source vacuum to various vacuum control motors (18A318) . Refer to the System Airflow Schematic and Vacuum Control Charts.
  • An internal single-pole electrical switch is also controlled by the selector. The switch controls the electrical supply to the heater blower motor switch (18578) .
  • The position of the function selector knob determines the manner in which the system will operate.
  • Each position of the function selector knob is detented for positive engagement.
  • You probably have a vacuum leak , Pull heater control panel an check for vacuum . A broke vacuum hose or The vacuum selector valve is bad ! Or check for a vacuum hose in the engine compartment being off somewhere !

Mar 08, 2015 | 2001 Ford Windstar

1 Answer

1997 Ford Taurus front defrost not working


. Air won't blow out of the floor or center vents just defrost ? Do you have manual or automatic climate control ?
Air Flow Control
Air flow control is accomplished in the following manner:
  • Primary control is through the function selector knob mounted on the A/C-heater function selector switch, which is part of the integrated control panel.
  • The function selector knob has the following positions: OFF, MAX A/C, A/C, PANEL, PANEL/FLOOR, FLOOR, FLOOR/DEFROST and DEFROST. The A/C-heater function selector switch combines a vacuum selector valve with an internal electrical switch.
  • The vacuum selector valve directs source vacuum to various vacuum control motors (18A318). Refer to the Vacuum Control Diagram , System Airflow Schematics and Vacuum Control Chart .
  • Two internal, single-pole electrical switches are also controlled by the A/C-heater function selector switch. The combination of these electrical switches controls the electrical supply to the A/C clutch and heater blower motor switch (18578).
  • The position of the function selector knob determines the manner in which the system will operate.
  • Each position of the function selector knob is detented for positive engagement.
  • Vacuum Control Motors The vacuum control motors (18A318):
    • are located on the A/C evaporator housing, A/C recirculation air duct and heater air plenum chamber (18471).
    • direct system airflow to the vehicle interior as determined by the remote climate control module or manual override.
    • The five-passenger seating configuration has an additional vacuum control motor mounted on the heater air plenum chamber to control airflow to the rear seat A/C register (19893).


vacuum control motor-i4bq0ig33y1522pr2d2rrkk3-2-0.gif

Jul 09, 2017 | Ford Cars & Trucks

1 Answer

1995 nissan sentra remove the dash board


Pick up a Haynes manual. It has helped me a lot! It will give you advice and help walk you through things like removing your dashboard. Mine has helped me SO much! Worth the money to have. I keep mine IN my car. You can also view the manual online through libraries sometimes if you have a library card.

Apr 19, 2012 | 1995 Nissan Sentra

1 Answer

The heat only come out the vents. I turn knob to defrost or floor and it does nothing it just stays on the vents


the selector knob or lever uses vacuum from the engine to open and close the doors that direct the air throughout your dash. check for vacuum leaks.

Dec 04, 2010 | GMC Jimmy Cars & Trucks

2 Answers

The knob turns on the vent control but it does not change the air


you need to check the control wire is`nt broken most likely come out from flap connection just reconnect and it will work again,check the flap affected for free movement as could be jamming.

Jul 10, 2009 | 2000 Ford Focus

1 Answer

HVAC vent selector does not function. Air flow is


THe blend door seems to be stuck. When you change settings from defrost to floor air or, vent, the blend door opens and closes directing the air to the place you want it to go to. I have had some success spraying a lubricating oil such as WD40 under the dash on the blend door. You need to get under the dash with a flashlight to locate it. It looks like a flap. Spray it with a couple of shots of the WD40. Go easy on the spraying as you may be inhaling the fumes. Keep the doors and windows open to minimize the fumes. Wait about 1/2 hour and try the A/C functions. (defrost, floor, vent air)

Mar 09, 2009 | 2002 Buick Rendezvous

1 Answer

Cannot get heat out of floor vents -only defrost and dash heat


i had a simmiler problem on my 95 chevy pick up. on mine it would not chg. from floor to defrost, no matter where i put the selector. with mine it was the controls. if you go under solutions for k1500chevy gmc trucks it should tell you what your problem is, or give you an idea whats going on with yours.

Jan 12, 2009 | 1998 GMC Jimmy

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