Question about 1996 Ford Ranger SuperCab

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Where is the little door that closes off when you turn on the heat to turn the cold air flow off

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  • Glenda Amox Nov 20, 2009

    Can you tell me where the door is. Under the dash - under the hood. I replaced the heater control knob and that helps with changing from hot to cold but it is still cold. I need to see if the door is shuting off the cool air someone else said I may need a spring that closes the door. I cannot find the door. Thanks

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ITS THE SAME DOOR
The thing that turns them over from hot to cold is a air valve that shuts off the clod water and opens the valve to let the hot water to go around the heater system so you get hot air,,, and when you turn the switch to cold it turns off the flow of water to the heater and so it blows cold.
Have a goodday Ron

Posted on Nov 19, 2009

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2008 jeep liberty no heat or little heat.


I would test your blend door actuator and your blower motor, put a voltometer on them both and see what kind of voltage you get, with the heat on, next pull out the HVAC control in your dash and find out what the voltage is going to the control it you have voltage going to th control and not to the actuator or the blower motor the you know your control is bad. if you have voltage going to both then pull them and visually check to make sure they are turning properly. The blower motor will spin very fast and the actuator will be ver slow. I hope this helps you

Dec 13, 2013 | Cars & Trucks

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Heat coming from vent when nothing is on. AC is noisy when turned on but is not blowing out cold air. What is causing this?


Could be a blend door problem. On most modern cars the coolant flows thru the heater all the time, and the HVAC system controls the cabin temp by opening and closing vent doors. When you turn or slide the temp selector it makes the blend door or doors open and close for the heater core and A/C evap.
I would have someone check under the dash and see if the doors are moving.

Jun 27, 2012 | Cars & Trucks

1 Answer

Rear vents blow out hot air when a/c is on


Keep this principle in mind: Heat, flows INTO cold... When you hold an ice cube in your hand, your hand gets cold because the heat from your hand is flowing INTO the clod ice cube, NOT because the cold is flowing into your hand.

On this particular vehicle (like many modern vehicles), hot water from the engine flows through the heater core at all times, even when you have the A/C on or when you have nothing (A/C, heat or vent) on. The system uses a door that closes down over the air opening to the heater core to keep you from feeling warm/hot air when it is not desired. The reason(s) you feel that the vent air is warm even when the outside temperature is somewhat cool is/could be caused by the following:

First, although as mentioned above, the heater core is restricted from receiving air when you are not commanding heat by the control panel, the heater core ultimately ends up as warm as the engine temperature. This is generally somewhere around 200 degrees F. Because all the air coming out of your vent(s) must pass over the door that restricts air over the heater core, and because the heater core gets so hot, some of that heat is picked up by air passing over the hot door even though it is closed.

Second, the door that restricts airflow from passing over the heater core has a seal around it. After a period of time this rubber (or usually felt) seal deteriorates, allowing some air to actually pass over the heater core. Since the core is hot all the time, some of the air gets heat loaded, producing warmed air.

Third, the door is operated by (in the case of your vehicle) an electric motor which responds gradually/proportionately to the setting you select on the temperature dial. If the motor gets out of calibration (can happen from time to time), if the control head has a 'glitch' and sends an incorrect signal (chronically, usually), or if the electric motor (called an actuator and contains its own little electronic 'brain') becomes faulty, the door may not be closing completely. This symptom can also be caused by a problem with the door itself, where the door gets stuck due to warping of the plastic case, a foreign object preventing it from closing (usually a pen or toy dropped into a vent or defrost opening), or a broken or cracked door hinge.

Last, the vent intake opening, where the 'fresh' air comes into the car on the 'vent' setting, is located just below the windshield on the passenger side. This opening receives its air directly off of the sun-baked, engine-heated hood and because of this the air is never as cool as outside air even on a cooler night.

I hope this answers your question. Many domestic vehicle manufacturers have begun installing heater control valves on their vehicles once again as they nearly all used to have. Note that the fix for most everything I have mentioned here requires removal of the dash of the vehicle or replacement of the control head and therefore is in many cases not worth the investment if it is not an extreme problem (for example, unless the system is stuck on full heat in the middle of summer. Additionally, remember that, if you so desire, manual shutoff valves can be placed in the heater hose lines (please consult a qualified mechanic as water from a vehicle can and will scald and burn you!), allowing you to manually shut off the flow of water into the heater core, thus reducing some of the heat (Readers note that certain foreign vehicles REQUIRE water flow through the heater core at all times for engine cooling and are not candidates for this procedure!).


Parts Of BMW.

May 30, 2012 | Cars & Trucks

1 Answer

Heater core replaced still no heat or air flow


Their are little vaccume acuators that open and close little doors in your ac system and heat they seperate the hot and cold their not opening you should be able to reach under and open and close if thats not it try replacing the blower fan under the hood on the fire wall well check all fuses first pull the out one by one and check them under dash and under hood

May 11, 2012 | 2001 Pontiac Aztek

1 Answer

When i turn the heat on it makes a clicking sound, and it blows out cold air, but when i turn cold temp on the clicking sound stops, until heat temp is turned back on. please tell me how to fix this...


Your ac blend door is broken or the actuator that opens and closes the door is broken. The ac blend door moves up and down to direct air flow through the heater core(for heating) or evaporator core(for cooling).

When the door mechanism breaks, the blend door falls down and you will only have ac but no heating.

You can buy a ac blend door kit for your explorer, they cost about $120 on ebay or other places.
search for Explorer ac blend door kit.

The duct is under the the dash on the drivers side. And you will have to cut open the duct to install the replacement door.

Heres a link to a tutorial of how to do the job.

http://www.heatertreater.net/Ford%20Explorer%2002-08.html

Sep 19, 2011 | 2004 Ford Explorer

1 Answer

My 2001 gmc sonama heater doesn't work ..only blows out cold air...what's wrong?


This no heat problem is one off two things, you may be low on coolant and its not flowing into heatercore or the actuator motor that controls the blend door is bad, the blend door is a door in the heater boxs that opens or closes to give you hot air or cold.

Dec 09, 2010 | 2001 GMC Sonoma Extended Cab

3 Answers

When I turn on the heat only cold air comes out of the vent. Can you tell me what can be wrong and what part I will need to repair this problem. Thank You


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It's your blend door actuator which is sticking. Probably the plastic teeth on the cog inside are worn. It is white plastic and is located behind your radio. It controls the opening of your blend door from A/C (closed) to heat (open). Buy a Ford Windstar radio removal tool from any parts store (less than $10.00) remove the radio. You will then have access to the actuator. At the bottom right you will see a little plastic wheel with an indented square. Find a long flat head screwdriver that will fit diagonally into the square and turn it clockwise slowly. The blend door should pop open and heat will enter the cabin. Finally when you have the time replace the unit. They sell for about $75.00 at the dealer or cheaper elsewhere. Good luck. This worked for me.

Oct 07, 2010 | 2001 Ford Windstar

1 Answer

2004 mercury mountaineer.heat problem When turning ac knob to heat clicking sound like door opening and closing repeatedly sounds and air blows cold instead of hot.


2004 mercury mountaineer.heat problem
When turning ac knob to heat clicking sound like door opening and closing repeatedly sounds and air blows cold instead of hot.

Sep 13, 2010 | 2004 Mercury Mountaineer

1 Answer

2000 chevy astro cargo van. the heat registers on the gage but little comes out and only out defrost. thermostat????


If it is blowing hot air out of the defroster and not out of the heater vents then the door that directs the heat from the defroster isn't working properly it is blocking the heat from going to the heater vents. Also check the cold air door. It sounds like it isn't closing all the way to shut off the cold air and not letting the hot air pass.

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