Question about 2000 GMC Sierra

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The selector switch will not change the air flow from top to bottom vents is the switch bad or what?

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It is the vent door actuator motor,it is located on the bottom of the blower box toward the middle of the dash underneth.It is a flat box with small wires going to it.

Posted on Mar 30, 2011

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1 Answer

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

2 Answers

2002 mountaineer heater works, but won't blow out of the top vents that. The bottom vents work fine.


Unfortunately you are going to have to remove the dash to fix this problem. What has happened can be one of two things. The first is the ductwork has become unattached leading to the top vents. The second possibility is a damper is not working. With the engine off and the switch on, put the selector to defrost while listening closely. You should hear dampers opening and closing. If you don't, that may be the problem. They are either electrically controlled or operate off of vacuum. Hope this helps

Dec 31, 2014 | 2002 Mercury Mountaineer

1 Answer

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

1 Answer

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Pull out the cover over the gear switch selector. Then pull out the vent controller and make sure that the wiring connector is connected tightly to the back of the switch.

Dec 15, 2013 | 2009 Dodge Caliber SXT

1 Answer

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Works off of vacuum, check all vacuum hoses for leaks or dry rot.

Dec 04, 2013 | Honda Cars & Trucks

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Nissan sentra air conditioning


The flow switch it change's howthe air flows get a motor manual at auto parts stir about 25 bucs it will tell u what up

Apr 29, 2013 | Cars & Trucks

1 Answer

Air not coming through dashboard vents


checks the air flow selector but it sure do not have vacuum in the control panel and it works with vacuum from the engine has a small hose that is used for vacuum and this controls the gate that directs air to the places diferntes ...

Jun 25, 2010 | 1997 Chevrolet S-10 Pickup

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

Blower vents on 86 regal


The blend door in the heater box itself is what directs the air to where it needs to go as per selector switch. The heater box is located under the dash.

Jun 13, 2008 | 1986 Buick Regal

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