Question about 2000 Mercury Sable

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There is no heat coming from the vents.

Fluid is flowing , system is full the doors on the heater box are working the temper selector chances from wram to very cold . I dont have must hair left what do you think.

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I would change the thermostat and see if that helps

Posted on Feb 15, 2009

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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

Why my air condition blow cold air even when its not on


It blows cold air with the mode selector in what position. If it is on defrost and you have the temp adjusted to full heat than the a/c will be on to dry the air before it hits the windshield, this helps to remove the fog from the windows. If there is no heat coming out the vents than you need to check to make sure the blend door is working. You should hear a distinctly different sound out the vents when you turn the heat from full cold to full hot. Also check to see if the heater core is plugged. With the engine warm you should be able to feel little difference in the temp of the two hoses that go to the heater core. If one is hot and one is cool than there is a flow issue. Either the water control valve is bad, it is not being opened by the HVAC control head, the is a vacuum leak to the control valve or the heater core is plugged. Your vehicle may or may not have a valve that controls the flow of hot water to the heater core.

Sep 08, 2013 | Ford Ranger Cars & Trucks

1 Answer

Ac comes out heat vent


I would say the blend door is stuck or something happened to the selector on the dash. The system uses engine vac to move the blend door and direct air flow. If the vac source fails, the system is supposed to default to the defroster position.

Jul 15, 2012 | Chevrolet S 10 Cars & Trucks

1 Answer

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

Please describe your my blower works in my 1999 windstar but it wont get warm problem


If your not getting any heat out of the vents and the blower motor is working than the first thing to do is check the coolant level. If it is low the first thing to stop working is the heat.

If its full than make sure the engine is coming up to temp. The temp gauge should read around 200 degrees F. when the engine is up to full operating temp.

If the those two are o.k. that make sure you hear a difference in air flow out of the vent when you switch the heat selector from full cold to full hot. If you hear no difference than you may have a blend door or blend door actuator problem.

If all that checks out than the last thing may be a plugged heater core. Especially if the coolant is muddy looking (really common with fords). Back flushing the heater core may help or cure the problem.

Dec 16, 2010 | Ford Windstar Cars & Trucks

2 Answers

Blend door functions, why no heat? exactly where is heat core?


First, there are two doors inside the heater. one door changes air flow between heat and A/c, the other changes where air is going (vent, floor, defrost etc). You did not mention if when you moved the door by hand, if you got heat when you did that, or, if the motor you removed had vacuum going to it and if it was functioning when you moved the dash control. Next, you don't need to cut holes in the box to check the core. If the hoses going to and from the core are getting hot, likely you have flow going through it. You can do a temporary visual check by replacing one hose with a clear plastic one and observing flow. (don't leave plastic in place as it will get soft when hot and will eventually fail.). You either have a vacuum problem not allowing blend doors to move, a second door that is jammed, an obstruction, internal or external (leaves, mouse nest etc) of the heater core.
If yours has a heater control valve that is installed on the heater hoses, check that as well (failure default is usually full on which will normally give you heat, but they can stick in the wrong position as well).
Last, I know removing the box is a real pain. Generally though, in the end you will need to remove it if the core needs changing. I'd first attempt to flush the core, independently of the system by removing both hoses at the engine and draining the core, then filling it with flush, waiting a half hour or so and then blowing it out both ways with a garden hose.

Nov 09, 2009 | Jeep Grand Cherokee Cars & Trucks

1 Answer

P0411 is what is says is my problem with my 1997 Ford Taurus When my heater is on it makes a clicking noise. What could is the most likely problem and how can i fix it?


i belive that the dtc that you have is not related to the clicking noise at all. apparently p0411 is concerning the secondary air injection. the clicking noise however would be a stuck or broken blend door or blend door motor. usualy the hvac system utilizes 3/4 of these blend door motors. to further diagnose this start your heater with the heat on full and fans at the normal face vents and move the vent selector from that inital position to the last position and if the clicking quits at any point then it would be that blend door motor. if that doesnt work then try to slowly move the heat selector from full heat to full cold, same deal. and if still at that point its making noise see if it goes away by selecting recirculate to fresh air....

Aug 31, 2009 | Ford Taurus Cars & Trucks

1 Answer

Climate control system only blow air out defrost vent


there is a good chance that you blend air door is stuck closed over your heater core and therefore not allowing the heat to flow, also your door that opens and close your direction of flow from the floor ,das,vent and defrost.your going to have to remove the lower cowling of the dash on the passenger side analso some of the center dash to actually check to see if the cable,servo motors. are acuating the doors.the issue could be just a stuck door or a misaligned cable or that it came off. that falls under the mechanical side of probabilities. electrical would most likely be a faulty selector switch or a servo motor

May 15, 2009 | 2002 Ford Expedition

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.


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  • 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:

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Mar 03, 2009 | 1998 Ford Windstar

1 Answer

Blower vents on 86 regal


The blend door in the heater box itself is what directs the air to where it needs to go as per selector switch. The heater box is located under the dash.

Jun 13, 2008 | 1986 Buick Regal

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