Question about 1999 Dodge Dakota

On a 1999 Dodge Dakota, is the heat selector switch electrical or a vacuum switch. The truck in question has no heat coming out the floor register or no vent or air condition when you change the selector switch. The selector switch do not seem to change the out put from the floor the the vents to the defroster.

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Gio Lamarre

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7 Answers

You may have an inoperative switch

Posted on Dec 18, 2017

5 Related Answers

Stan R

37 Answers

SOURCE: PROBLEM WHEN SELECTING THE DIRECTION FOR THE AIR

Sounds like you have a supply vacuum problem. When you lose supply vacuum to the control head it defaults to defrost.

Posted on Mar 13, 2009

Anonymous

183 Answers

SOURCE: air conditioning on a 2000 chevy impala

If it will not switch to any different positions,and you did not have this problem prior to repair.Check for a leaking vacuum line to the control unit.The line should run through the firewall to the control unit.Good Luck!!!

Posted on Aug 04, 2008

Anonymous

146 Answers

SOURCE: 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.

Posted on Jan 05, 2009

Anonymous

1118 Answers

SOURCE: 1999 Chevrolet Suburban ac selector door motor.

it should be under dash next to gas peddle on left end of heater box not that hard 2 screws and a plug. its called heater blend door actuator.

Posted on Jan 28, 2009

Anonymous

114 Answers

SOURCE: ac will not blow thru ac vents, only thru defrost vents.

if vent doors are operated by vacuum check for loose or broken vacuum hoses in the engine compartment , or check the fuse box for any ac/heat fuses if it is a electricaly controoled system

Posted on May 04, 2009

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1 Answer

My 1999 dodge dakota only blows out heat or A/c fom the defroster

Mode door actuator bad > electric motor that switches mode door from floor to vents to defrost ! Google mode door actuator for dodge Dakota ! Mite be a video on youtube showing how to fix it !

Dec 07, 2016 | 1999 Dodge Dakota

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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

A\c and heat only come out floor and defroster

Could be a bad servo motor.

Mar 05, 2015 | 1997 Dodge Ram 2500 Club Cab

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I have a 2011 Dodge Avenger and when I put the heat on floor it blows cold? The heat works on dash and on defrost just don't blow hot in floor.

Damper-door not moving. Check for obstruction under dashboard passenger-side toward middle of car. Pinched, leaking or disconnected vacuum-hose. Check manifold behind selector-switch for same-thing.

Feb 19, 2015 | Dodge Cars & Trucks

1 Answer

Why Does air only come out of floor vents ?

There is a mode selector door on the unit. It moves a flap inside to direct the air flow to vent, floor or defrost. It is driven by a vacuum or electric motor and or cable. The door can get stuck the shaft can come loose or the connection can break to the motor. The other lever on the air unit is the blend door and it controls hot and cold. To see these you can look under the dash from the passenger side or take the glove box door stops out so that it opens all the way. Then you can check to see what lever works.

Jun 11, 2014 | 2004 Dodge Dakota

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

My 1999 dodge ram 1500 only puts heat out on defrost no matter where i put the switch it will keep blowing when i put the switch on floor and other settings but will not put heat out there

I believe you have a vacuum problem the system is controlled by vacuum check to see if a vacuum line is off the engine or a vacuum line has become soft and closes up when the engine is started. Find a quiet place start engine and listen for a hiss.

Feb 17, 2013 | 1999 Dodge Ram

1 Answer

Hello I have a 1993 dodge dakota but for some reason only the the windshield vents work when I took my stereo out i saw some unhooked hoses? Anyone know where they belong or how to hook this back up? help...

The vent selector works on vacuum. Those hoses are vacuum lines. They would connect to the back of the vent select switch, the one that you use to select what vent you want the heat to blow out of.

Jun 05, 2011 | 1993 Dodge Dakota

1 Answer

Ac/heat goes out defrost only. will not go thru vents of floor on a 1997 dodge dakota

your vacume line to the selector is probably off or has a hole in at.

Mar 07, 2009 | 1997 Dodge Dakota

1 Answer

I have the same problem with my windstar blower is fine but is coming cold air but no heat i dont know what to do can any one show me how to fix it thnx

First, feel the heater hoses going into the firewall under the hood. If they are hot, then you have hot engine coolant going into the heater core. If they are not hot, then you either have a bad thermostat or you are very low on engine coolant.

Next you need air flowing through the heater core so it can come out heated through your vents. If the iar is flowing somewhere else, your temp blend door is not moving because the bend door motor is bad or your temp knob on your heater controls is bad. The blend door motor is an electric motor.

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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.

Temperature Control
The temperature control operates in the following manner:

Temperature control of the heater system is determined by the position of the temperature control knob (between COOL-BLUE and WARM-RED) of the heater control .
This control knob is connected to a potentiometer mounted in the heater control . This potentiometer is electrically connected to the electric blend door actuator that operates the A/C air temperature control door.

Movement of the control knob from COOL (Blue) to WARM (Red) causes a corresponding movement on the air temperature control door and determines the temperature that the system will maintain.

System uses a reheat method to provide conditioned air to the passenger compartment.

All airflow from the blower motor (18527) passes through the A/C evaporator housing .
Temperature is then regulated by reheating a portion of the air and blending it with the remaining cool air to the desired temperature.
Temperature blending is varied by the air temperature control door, which regulates the amount of air that flows through and/or around the heater core (18476) , where it is then mixed and distributed.

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inside you plenum box: