94 Town Car Fan Speed

[ELindy]

The fan switch only runs the blower on high. I am not sure if it could be the resistor pack and if so where is it located. Or what else it could be?

[olopezm]

Hi there,

Check at the passenger side in the engine compartment, that's where the blower motor and the speed controller are located (I don't remember the exact name but it's different to a blower motor resistor).

Best regards,

Oscar.

[remark123]

If it is a '98 and up, it is probably the blower speed control module, located right at the back of the passenger side cylinder bank. It is barely visible under the two hoses running into the heater. It is a bit of a chore, but not impossible to replace. The part runs about $60 from a Ford dealer, or if you are feeling adventurous, you can take a soldering iron to the cold solder joints inside, and voila, it will work.
Good Luck!

[ELindy]

It looks like there is a blower motor resistor in the heater/air conditioning case, and a relay or two that I can test. And then maybe the switch itself but I am guessing the resistor. Hopefully I will get a chance to look at it this weekend.....

[ELindy]

I found time to look at the blower speed problem and I found a burned circuit board on the transistorized blower speed controller module. One of the center pins on the circuit board in the second picture is burned black. (not like the new one pictured),
This one has the auto temp control and I have not found one on the internet yet, they all seem to be for manual temp control.
I am going to shop around for one tomorrow and see what I can find.

Thanks for everyones help.

[ELindy]

Here is the pic of my burnt one. If anyone knows where to get one at a good price I would appreciate any help.

[olopezm]

Woah! That's a mess!

You could try and fix your old one it might work. Give it a good clean with acetone and see if the tracks seem burned, you might have only a bad solder caused by high current and temperature. If this is your problem just use some solder and an iron to fix it.

If the tracks look damaged you can use some thick wire (to handle the high current) and jump from the damaged track to the transistor's pin. When you're done spray some clear coat on it to avoid any possible shorts.

Best regards,

Oscar.

As a side note a relay on the EATC module has a similar problem, the pin gets desoldered and the AC stops working. Soldering it back gets the job done!

[ELindy]

I am not sure why the circuit burned originally or how long this fix will last but I have successfully repaired the circuit with a wire and solder.
After I made the repair I tested it before installing since it is a little tight to get in and out. I reinstalled the controller and ran a few errands to test it out further and I now have full blower control at all speeds. And the auto temp control is now working properly again.

There are 5 pins coming into this circuit board (indicated with arrows) and each pin has its own circuit. The white arrow in the pic is the incoming pin for the circuit that was burned on mine. The red line follows the circuit that needed to be reestablished. I soldered the wire to the screw where the burn originally occurred and the other end of the wire is soldered to the pin itself as shown in the second pic. I could have soldered the wire to the top of the circuit board at the incoming pin solder but soldering it to the pin itself seemed a stronger and out of the way place with less change of damaging something.







I will update this as time goes on to let you know how it is holding up. I think it will last a good long time but we will see.
I would like to say "Thank You" for all the help I received. I could not have made this repair without it.

[olopezm]

No problem buddy!

I'm not sure either why it happens but I've seen the same problem several times, and most people say it is caused by prolonged use and the high amount of current and heat produced by the circuit.

That type of transistor is normally used for very high current demand (45+ amperes) so you can have an idea of how much heat that thing produces.

I hope you get lots of service out of the repair you just did and enjoy your Lincoln!

Best regards,

Oscar.

[mitchell12]

If you mean the resistor that gives you different speeds it is very easy remove the glove box screws (2) at the bottom of the glove box and remove it The resistor is right in front of you.
Cheap Lexus Accessories

[ELindy]

UPDATE: I promised I would update with how this fix has lasted. 1 month now and still going with no problem. I will update if and when it fails.