Question about 2003 Dodge Caravan

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Heater Selector Switch

My 1997 Dodge Grand Caravan has developed a problem whereby my selector switch for the heater will not change from vents to defrost. Could the switch be defective?

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  • Anonymous Mar 27, 2014

    Have not done anything yet what should I look for? Vacuum lines?

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  • 121 Answers

Yes it could be the switch but you should be able to reach up under the dash and manually switch the vents by hand

Posted on Oct 08, 2008

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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

2 Answers

My a/c blows out of defrost vents and the selector wont change it


Your selector is controlled either my linkage or pressure tubes. A common problem is for a crack to develop in the hoses and leak the pressure needed to switch to the desired setting. Inspect the hoses and or linkage. that will solve it

Apr 01, 2012 | 2001 Isuzu Rodeo

1 Answer

Vacume line diagram for 2001 dodge grand caravan looking for the line that runs to the ac / heater,


It sounds like vacuum is not getting to the vent, heat and A/C controls. Find the vacuum can. It may be under the hood on one of the inner fenders. Trace the lines back to the vacuum block at the intake manifold or fire-wall, and also back to where the line goes thru the fire-wall. Check the can for leaks or obvious holes. They used to be just a plain metal can, but it could be a plastic ball. Check the lines as you go for breaks and rub-thru's. Move the controls thru all settings and listen for vent door movement. (Run the engine momentarily to build vacuum in the system.) Worst case is a bad vacuum motor or air flow position selector switch.

Aug 03, 2011 | 2001 Dodge Caravan

2 Answers

2005 grand caravan front heater and defrorst not working ,rear heater is working . i also hear a hissing noice on the passenger side


Just a suspicion: hissing noise comes from failed/jammed/malfunctioning motor to move the door
in the ducting to route heated air to the hoses/ports for "heater" and "defrost."
Problem: failure of motor/linkage to heater/defrost selector door under the dash on the passenger side.
Also sounds like you have not blown fuse to this selector door.
Also - hissing noise could be air being forced against the closed door (which should be open) - in this
case, you'd want to check the fuse to the heater/defroster actuator door.
The rear heater works since its function is not related to the operation of the front heater/defroster.

Jan 02, 2011 | 2005 Dodge Grand Caravan

1 Answer

The Heater selector won't change from defrost to any other settings like floor heat or straight from the dash . the switch on the dash moves but the heat only comes from the defrost vents in the dashboard


hello, sounds like the cable broke or, lots of newer veichels use air lines, any way possible, check and see if air lines are still hooked up to the back of the heater controls, should be 4or 5 air lines together, all hook on one place behind heater controlls

Feb 06, 2010 | 1993 Jeep Grand Cherokee

1 Answer

Vent selector inop


U have either lost the vacuum to the mode selector switch (in the dash control) or the vacuum mode selector switch is leaking in the ac/heater control in the dash, u can usually hear a hiss if it is leaking. the vacuum source is the engine, a small hose runs through the firewall on the passenger side to the switch from the eng vacuum source.

May 19, 2009 | 1994 Chevrolet S-10

1 Answer

Heater vent doesn't shift to all positions


Sounds like you have a vacuum leak, those controls are are accuated by vacuum.

Dec 02, 2008 | 1995 Jeep Grand Cherokee

2 Answers

Heater won't get hot on 2005 dodge caravan


there could be an air lock in the system, pluged heator core, a bad thermostate or control modual. try bleeding the air out through the bleeder screew if there is no heat after that have the control modual tested if its okay try having the cooling system flushed then if it still doesnt heat intall new termostate

Oct 22, 2008 | 2000 Dodge Caravan

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