Question about 1996 GMC Jimmy

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When I turn the air conditioner on, no matter what position I turn the selector knob to, the air only blows out of the front defroster vent

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Ur control panel with the 3 knobs is bad the board goes bad

Posted on Mar 28, 2010

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Hi there,
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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

1 Answer

07 dodge charger air conditioner will not work properly


SOUNDS LIKE THE SWITCH HAS GONE BAD. YOU CAN GO ON LINE TO EBAY AND MOST LIKELY FIND A REPLACEMENT. I HAD TO REPLACE MINE ON MY 2008 SEBRING.

May 06, 2014 | Cars & Trucks

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

Defrost isn't blowing air


ur r going to have to check the button or the release lever that alouds u to move the air to the other positions sometimes that's the problem

Nov 29, 2013 | 1996 Volvo 850

1 Answer

1998 Mustang - AC blows only through Defrost vents


You probably have a vacuum leak on the passenger side. its a small plastic hose some times they come unpluged from the engine. or brake.

Jan 05, 2009 | 1998 Ford Mustang

1 Answer

Front defrost vent doesn't blow any hot air.


You may need to replace the mode selector switch.

Oct 18, 2008 | 1998 Ford Taurus

3 Answers

Air flow selector


Your mode door is controlled by vacuum check the vacuum hose on the left side of the intake manifold. these some times fall off leaving your mode door with no vacuum and the default position of the mod door is defrost.

Jun 09, 2008 | 2004 Jeep Grand Cherokee

1 Answer

Heat/ac


Hello,
You would be wise to check all the small rubber hoses under the hood as it would appear that you have a vacuum leak preventing the airflow door from moving to any other position. Look for cracked /cracking, split hoses or disconnected hoses and replace as necessary.

Good Luck!
Rich Lilja

Jun 04, 2008 | 1999 Ford Taurus

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