Question about 1999 Mercury Grand Marquis

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The heater / ac blendoor does not accuate. I replaced the electronic door mover. I was told it could be the climate control sensor. What do you think?

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Yes that is what I would say. As long as door is not stuck .

Posted on Oct 06, 2009

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1 Answer

Replaced heater blend door and accuator but accuator will not work


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The heater/AC control is fairly complex. AC is used to defrost windows even in the winter, so not unusual to have it on. Is this a climate control system with temperature sensors or just manually controlled from dials on the heater control? Could be just the heater control is bad. If a climate control system, then we need to look at all of the sensors first.

Dec 10, 2011 | 2000 Oldsmobile Bravada

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My ac was working fine then one day it stopped and now only hot air blows out the mechanic said the ac is fine and works good but there is a vent door that switches the ac to heater and he said it was...


There is a blender that controls the air flow to go through the heater core for heat, and the evaporator for AC. It very well could be stuck.

You maybe able to try and get it to get unstuck by running the cars AC and switching from heat to AC back and forth and see if it gets unstuck. Just turn it on full blast and go from heat to cool.

If that fails, then you may need to service it. There should be a Lever Marked VENT under the dash, usually by the Brake and other pedals on the Driver's Side. Close the VENT and that will stop the Air from coming in and leave the A/C Blowing through the outlets(Vents).

I also read this online if you have an electronic climate control. "On climate control press off and heat button and let go quickly. Then press automatic. The display will start rotating eventually displaying a code 025,125 , 024 etc. Then press defrost to stop. You may hear blend door operating atb that time. It worked for my climate control."

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Time to either flush or replace the heater core as it may be plugged with rust build-up. I'm assuming the engine is running at normal operating temperature, if not then the thermostat may need replaced.

Mar 04, 2011 | 2000 Ford Expedition

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No heat engine warm fan works on all levels directional control (defrost@floor) stuck on cold. ?temp control .


your heater core could be plugged if your anti-freeze color is a brownish colour , most likely your heater core is plugged also when you move the direction for heat control can you hear the blendoor move if you can then again your heater core may be plugged and if it is plugged flushing most likely wont fix it, if you don't hear the blendoor motor move the blendoor motor or the door may be damaged

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96 LINCOLN TOWNCAR STUCK ON HEAT ONLY !


The heater and a/c blend door actuator motor is located behind the center of the dash just below the windshield. The steering column must be detached and lowered and the dash must be removed to access the blend door motor.

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