a/c fan goes on and off

[mdkmemphis]

By my 2000 Town Car the fan of then A/c unit goes after some few minutes in high speed on and off. Stop and again on and out intermittently.
It take some few minutes then the fan run at low speed and then high speed
It is independent if cool or hot air is needed.
What can be ?

[MichiganTeddyBear]

most cars these days run the AC even when heating, unless the outside temp is too cold. they do that because dryer air does a better job at keeping windows clear than warm damp air.

thats probably why the fan (I am assuming radiator fan(s)) are cycling on/off

[Tman70]

Please clarify your question for us...
Is it;
1. You see the under hood cooling fan go on and off
2. You hear the A/C compressor clutch cycle on and off
3. You feel the A/C heater blower fan vary the airflow from the vents/floor/defroster on and off?

[mdkmemphis]

#3
only the blower goes on and off.
If cold is needed cold is coming.
If heat is needed heat is coming.
I am not very familiar with the Lincoln a/c automatic control.
In comparison to other brand in seem to me to be a little too much.

[Tman70]

Sounds an awful lot like your blower motor controller is on its way out. Try the test below first and let us know the results.

http://www.lincolnsonline.com/tech/00128.html

[MichiganTeddyBear]

ok, now that we know what fan...

yea, possibly the blower motor controller.

just an FYI, and may have no bearing on your 2000 TC. My 91 Continental with auto temp control has more than 'one' way for the automatic to work.

1 full auto.. you set temp, and the control manages everything else, blend door, what vent(s), and blower speed.

2 what I call 'semi' auto. you set temp in 'auto' mode, then manually adjust fan speed to what you want. all other features of the auto mode are same.

3 manual mode. you set temp, and what vents to use, and then it can control the fan speed, and blend door to maintain the temp. Also, can manually override fan speed here too, so all that it controls is the blend door.

dont know if the 2000 tc has a similar auto climate control, but thats the basics of how my 91 Conti's works.

[discountfordpart]

Hi to me it sounds just like the blower motor control and I know that these go bad more then they should. I do have it in stock part#6w7z-19e624-a it runs $30.71. Hope this helps. If you need any kind of diagrams or anything just let me know and I can get one for you.

Willie

[mdkmemphis]

I tried the test, I did the step to the pos.#2.But anstead to received any code , It show all the digits from the display.(fan speed, temp, ext,auto etc.)
the pulse tracer come but after that all the digits similar the picture of your description.

[mdkmemphis]

how can I recognize if it is the blower control ?
Have you any description how I can replace it?

[discountfordpart]

Hi Memphis send me your fax number and I will send you some directions and illustrations to locate and replace your blower control.


Willie

[mdkmemphis]

Hi Willie,

Here my fax # 702-577-3378

Thanks

Mike

[mdkmemphis]

I don't have received your fax

Mike

[discountfordpart]

I don't have received your fax

Mike

sorry about that, i'll have Willie fax it again.


Ed

[mdkmemphis]

Okay ED !
Fax is on.

Mike

[discountfordpart]

Okay ED !
Fax is on.

Mike



did you get it this time?

Ed

[mdkmemphis]

no

Fax # 702-577-3378

Mike

[discountfordpart]

I tried to send it myself, but got answer mech.

call me direct when you get a chance.

206-431-7331

Ed

[mdkmemphis]

Hi Ed,

have you the the section 303-03 for the draining and filling the cooling system ?


Mike

[discountfordpart]

Hi Ed,

have you the the section 303-03 for the draining and filling the cooling system ?


Mike

what is your email address?

Ed

[discountfordpart]

Hi Ed,

have you the the section 303-03 for the draining and filling the cooling system ?


Mike

NOT SURE THIS WILL WORK HERE, BUT HERE IT GOES.


Cooling System Draining, Filling and Bleeding

Draining

WARNING: To avoid personal injury, do not unscrew the coolant pressure relief cap while the engine is operating or hot. The coolant system is under pressure; steam and hot liquid can come out forcefully when the cap is loosened slightly.

CAUTION: The coolant must be recovered in a suitable, clean container for reuse. If the coolant is contaminated it must be recycled or disposed of correctly.

NOTE: Less than 80% of coolant capacity can be recovered with the engine in the vehicle. Dirty, rusty or contaminated coolant requires the system to be flushed and filled using new coolant. Always flush the system and fill with new coolant when replacing the water pump. In the event any hoses are removed, use appropriately sized worm clamps in place of the constant tension clamps.

Release the pressure in the cooling system by slowly turning the pressure relief cap one-half turn counterclockwise. When the pressure is released, remove the pressure relief cap.
Place a suitable container below the radiator draincock and drain the radiator.

Filling-Bleeding

CAUTION: Engine coolant provides freeze protection, boil protection, cooling efficiency and corrosion protection to the engine and cooling components. In order to obtain these protections, the engine coolant must be maintained at the correct concentration and fluid level in the degas bottle.

When adding engine coolant, use a 50/50 mixture of clean, drinkable water and engine coolant.

To maintain the integrity of the coolant and the cooling system:

Add Motorcraft Engine Coolant VC-4-A (in Oregon VC-5, in Canada CXC-10) or an equivalent meeting Ford specification ESE-M97B44-A.
Do not add orange-colored extended life coolant VC-2 or equivalent, meeting Ford specification WSS-M97B44-D. Mixing coolants may degrade the coolant's corrosion protection.
Do not add alcohol or methanol or any engine coolants mixed with alcohol or methanol antifreeze. These can cause engine damage from overheating or freezing.
Do not mix with recycled coolant unless it meets the requirements of Ford specification ESE-M97B44-A. Not all coolant recycling processes meet this specification; use of such a coolant may harm the engine and cooling system components.

Remove the thermostat. For additional information, refer to Thermostat in this section.
Disconnect the heater core coolant supply hose from the fitting at the rear of the manifold.
Add the coolant/water mixture through the thermostat opening until coolant appears at the heater core coolant supply outlet fitting at the rear of the manifold.

Install the heater hose, using an appropriately sized worm style clamp in place of the constant tension clamp.
Reinstall the thermostat gasket (O-ring) and the thermostat. For additional information, refer to Thermostat in this section.
Add the corect engine coolant mixture to the degas botle until the coolant level is between the "COOLANT FILL LEVEL" marks.
Select the maximum heater temperature and blower motor speed settings. Position the control to discharge air at the A/C vents in the instrument panel.
Run the engine until it reaches operating temperature.
CAUTION: If air discharge remains cool and the engine coolant temperature gauge does not move, the engine coolant level is low in the engine and must be filled. Stop the engine, allow it to cool and fill the cooling system.

Add the correct engine coolant mixture to the degas bottle until the coolant level is between the "COOLANT FILL LEVEL" marks.
Repeat steps 7 through 9 until the engine coolant mixture is between the "COOLANT FILL LEVEL" marks on the degas bottle. Turn off the engine and allow it to cool.
Check the freeze protection of the engine coolant mixture with Fluid Tester 014-R1060 or equivalent. Adjust freezing point range if necessary. For additional information, refer to Engine Cooling in this section.

[mdkmemphis]

Hi Ed,

You still have the blower motor Speed control ?

"Hi to me it sounds just like the blower motor control and I know that these go bad more then they should. I do have it in stock part#6w7z-19e624-a it runs $30.71. Hope this helps. If you need any kind of diagrams or anything just let me know and I can get one for you.

Willie"

Also filing the cooling system seem to be not a easy task.
Are sure that it is the right way for a Towncar 2000 ?
Let me know.


Thanks

MK