When i use the heat it only heats at it highest temp digital read out moves through its settings ok and all vacum servos seem to open and close when the different buttons are pressed but the hot air from any vent setting will not blow a medium temp only very hot. when max ac button is pushed the door behind glove box and in heater box will open all the way but but hot heat blows out ac vents.the ac compressor cycles on and off too quickly so i suppose it needs recharged but i think the heat should cool down when mixed with colder air.so i dont think its mixing with cold air in the heater box. where do i look for the dooor that mixes hot and cold air to make medium heat.? thanks
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Re: 1995 lincoln town car heater
The door opening & closing on Max a/c is the inside/outside air intake door.
The temp blend door is the one you are concernd about. It says you have to remove instrument panel for access. ouch!!!
------------------------------------- A/C Electronic Door Actuator Motor
The A/C electronic door actuator motor (19E616) is located on top of the A/C evaporator core housing assembly.
Its function is to move the A/C air temperature control door on command from the control assembly.
The A/C electronic door actuator motor contains a reversible electric motor and a potentiometer. The potentiometer wiper is connected to the actuator output shaft and moves with the output shaft to indicate the position of the A/C air temperature control door.
Battery voltage is applied to the ends of the potentiometer. The voltage available at the wiper indicates the position of the potentiometer. The actuator wiper voltage is sent to the control module and matched with the wiper voltage of the module potentiometer. The printed circuit board then drives the actuator motor in the direction necessary to make the actuator wiper voltage agree with the control module wiper voltage.
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#53 oxygen sensor heating circuit (get a new sensor)
#66 air assisted injector control circuit or circuit low
#32 oxygen heater control circuit high ( new sensor again)
theres a good chance you've several o2 sensors and I'd have to some reading on 66. I'm a chevy guy :)
If it is as you read the door control will be activated by a vacuum unit . Check for hoses that are missing cracked or broken. Move the control fro heat to cold and see if the door moves. The next thing to check is if the thermostat is not stuck open. Start the engine cold and see if the top radiator runs cold for say 10 minutes after which the hose should noticeably get hot quickly.
Before u do everything this idiot says , on your heat control dash press (off) and (floor) at the same time, within two seconds after that press the (automatic) button, your dash will begin to click and where it usually tells you the outside temp a fault code will begin flashing, let the dash click for about 60 seconds then turn the car off, when you turn the cat back on, blast the heat full blast on the highest temp and within minutes ull have heat again! Note, make sure ur engine temperature is warm before you do all that.
Temperature Control Blend Door Failure No Heat or no AC (dependes on
where door sticks)
all modern cars there is a tiny DC electric motor driven gear drive
that moves a plastic door that blends heated and cooled air from the
AC and the heater core, this is called (interestedly enough) the air
temperature control blend door actuator. The motor that moves this
door fails because the door starts sticking from warping, most common
complaint is no heat but it can be no AC as well. To replace these
parts (blend door and blend door actuator) you must remove the entire
dash from the car. Always have this problem confirmed by a dealer or
qualified repair shop as it is a very expensive repair.
causes of no heat in the cabin are engine thermostats that are stuck
open (engine runs cold) or air bubbles in the cooling system.
I would say either blend door issues or a vacuum control valve, heater
control valve or a vacuum hose to the heater system is leaking. I would start to suggest. You
are correct in checking the blend door. A computer scan should tell you
what temp the climate control thinks it is in the passenger compartment.
It may be a thermostat problem giving the climate control a false
reading. Your blend door is controlled by a servo motor under the dash.
You can remove the servo and watch to see if it moves when you change
the temp setting from heat to cool. Also, you should be able to manually
move the door to the heat position and see if you get heat.
U have a failed air temperature control electric blend door actuator, to replace this part requires the dash be removed from the car, the part is located on the outside of the heating duct about center of dash.
It sound's like one of two thing's, first open the glove compartment look behind to the left you will see a clear vacuum line going to a goldish in color accuator remove it once the vehicle is at normal operating temp. if you get heat then you have a problem with the vacuum switch, just plug the vacuum hose, you will have to reconnect it in the summer to get the AC working. The other problem could be the heater control valve, located under the hood inline on the hoses going to the heater core, upper passenger side of the fire wall.
- If temp guage reads normal, the lack of heat may be due to the Heater Control Valve. Located in front of the radiator. Lower passenger side. A real bugger to replace.
- The plastic cap just over the thermostat is key in re-filling the anti freeze and bleeding air.