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I have a 1994 Lincoln Town Car. After running for a few minutes the blower for the heater, AC , defrost jumps to full speed and stays at full speed. You have told me that the blower control programmer should be replaced. What is the best way to reach this unit ?
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They are designed to run on low all the time. This is to keep the cabin pressurized to avoid dust from the outside getting in while driving. If it is on another speed other than low then maybe the speed control is the culprit.
you should make a diagnostic to know what happened to your car of course you need an auto diagnostic tool :
http://www.chinasnoy.comand you can find all kinds of tools in chinasinoy.com
When one or more speeds on your heater/AC aren't functioning, the problem is usually the blower motor resistor. It's usually located near the firewall on the opposite side of the heater core.
I unpluged (on my 98 T.C.) the blower motor to check that it had power to it (it did). Pluged it back up, and it started working again, and has been for weeks now. david...
This sounds like a BSC blower speed controller. it is located outside on the a/c case just below the heater hoses. to diagnose just wiggle the connector with the key on engine off, you should hear the fan come on, then replace it.
You have a problem with the resistors on your blower motor. 95% of AC/Heater blower motors are located under the glove box in the passanger foot well. When you remove the motor you should see a resistor plate. Resistors are not servicable and will need to be replaced. This is a relatively cheap part, that you can replace yourself if your handy, if not take it to your local tech.
sounds like your switch contacts are shorted closed.. try disconnecting the switch for inspection and use a volt ohm meter to inspect switch across contacts...
I aasume you mean blower motor for heater/a/c system.
Does it work on hgih speed only? If yes, replace resister.
Is this manual a/c or electronic?
Here is circuit for manual. check these three fuses first. 1, 17 & 10 in fues panel behind dash or kick panel by driver's knee.
If you have electronic, you may have a bad "blower motor speed controller". Get used at car-part.com. page with asterisk is lowest price. New at tascafordparts.com
Idle air control valve.. clean it (mechanic will for just a few dollars) the other culprit would be the mass air flow sensor.. it is located in the air intake tube coming from the filter box.. its round and has one plug in.. if you take it out you will notice the inside looks alot like a honeycomb. its not cheap but I am 99% sure that is what you need....
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