Question about 1997 GMC Safari

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The air from the airconditioner and heater only will blow out the

The selector switch for the heater and airconditioner just stays on defrost, only blows out the top, the airconditioner works as well the heater but will not blow out the front vents or anywhere else?

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Sounds like a vacuum leak. Check the vac supply on the intake manifold. Passenger side front of intake.

Posted on Jun 24, 2009

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Posted on Jan 02, 2017

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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

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

2 Answers

1988 chevy sprint Heater defrost and floor heater works but face heater blows out cold air


this cars are not suppose to blow hot air to the face vents ,if you notice there is a blue arrow on the selector for face air

Dec 11, 2012 | Cars & Trucks

2 Answers

A/c blows thru defroster


Sounds like the switch behind the selector is eithe broken, or stuck in that posiition (or internally) is not moving. I suggest pulling the heater/ac selector unit out and checking the levers from the back side.
Please let me know if you need further assistance.
carsandcomps,
Guru, Premium Expert @ Fixya.com

Oct 02, 2010 | 2001 Mercury Mountaineer

1 Answer

2003 Dodge Ram 1500 quad cab. While replacing a


it may be the switch itself they do go bad.Otherwise he could have pinched a hose or left one off. But it sounds like he is trying to help.

Feb 11, 2010 | 2004 Dodge Ram 2500

3 Answers

HEATER NOT WORKING IN 2001 LEXUS RX 300


you most likely have a bad airmix servo. this happens alot on these. they are expensive to replace too.

Sep 10, 2009 | 2001 Lexus RX 300

2 Answers

When i have the heater/defroster on the heater below blows cold air while the defrost blows hot. when i switch to just defrost the bottom heater stays on and blows cold air. when i have front dash and...


It sounds like you have a blend air door stuck. This is in the housing of the heater a/c blower unit under the passenger side of the dash. There is a motor on the top of the housing that could possibly be stuck or on working.

May 10, 2009 | 2003 Dodge Durango

1 Answer

A/c and heater only blows thru defrost and side vents


your a/c and heater blow thru the defrost ( top of dash? ) and the vents. Or defrost/or the vents.? and not on the floor? Well all of these should work. can you hear the motor inside the dash turning to they're perspective spots on the dial the motor pulls a cable and closes or opens appropriate doors as the selector switch is moved. if not the switch may be faulty. and you can get it from a parts store or dealership. CK the parts store's first they will be cheaper and will be able to give you a look at what needs to be done to replace it. But it can be done on most "fine " cars in 20- 30 min with minimal hand tools.

Mar 26, 2009 | 1998 Mercedes-Benz C-Class

1 Answer

1994 Taurus heat control problem


First check to see if the water to the heater core is hot. if not then you need ti check the hot cold vale . it is an electric valve that opens to let the hot water bvy.

Dec 05, 2008 | 1994 Ford Taurus

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