QuestionRoland, Thanks for the reply but I do have the one with the Auto button and have no idea how that will be different. Sorry to have not specified that on the first message.
Thanks in advance. Jeff
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Followup To
Question -
Hello Roland,
I have a 1997 Chrysler LHS that the blower motor is stuck on high speed.
The only way to stop it is to pull the 25amp fuse but then of course you get no blower at all.
Please let me know how to find and replace the resistor switch or plug that controls the blower
Answer -
Hi Jeff,
I will assume that you have the standard 4-speed fan control unit, not the automatic temp control that has a 14-speed fan control. In that one, the resistor block is located in the air duct just to the left of the blower motor under the dash. You remove the under dash pad on the passenger side to get to it. It has a multiwire plug, and there are a couple of screws that hold the resistor structure in the air duct which when removed allows the block to drop out for replacement. The only question I have is the fact that it runs on high all the time, even when on "off". Others have told me that it typically fails by only running on high, but that it can be turned off without removing the fuse. I believe that might mean there is a problem with the switch in the control panel that would otherwise direct the current thru one of the three resistors or directly thru the motor. So if the resistors seem to be o.k. you might want to check the control switch.
Please let me know what you find.
Roland
AnswerHi Jeff,
The location of the multi(14)-voltage generating module in your system is the same as in the conventional one, except that instead of 3 resistors it has a couple of power transistors, a corrugated heat sink, and probably some capacitors and reistors on a printed circuit board. It's operation is directed by the body computer which is wired into the ATC control panel. I would suspect that this blower power module has a failed component in it rather than an issue with the control panel or the body computer. So again, go under the dash to the blower motor/air duct and remove the module and inspect the circuit board for any wet capacitors or burned out-looking components. I have not seen a circuit diagram for the module but if you can spot a bad component whose electrical characteristic or industry model number were identifiable that might allow you to replace it with a part from an electronics supply. If not, then again going for one from a wreck or buying a new module from the dealer is the only other solution. Please let me know how it works out.
Roland
