QuestionHi! I replaced the front blower resistor in my minivan (3.3L) because it would only work on the high setting; however, this did not fix the problem. Any suggestions greatly appreciated.
AnswerHi Paul,
I am limited to a manual no more recent than '98 but I would believe it applies to you '01 because it still uses the resistor block. The way the system works a full 12V is applied to one side of the motor but the other side is fed through the resistor block to the several taps and then the blower switch in the control panel connects one of the taps at a time to ground (return to the battery). So depending upon the resistance tap selected varying net voltages will be applied to the motor to produce the speeds.
If the blower turns off in the "off" position then I believe that there is nothing wrong with the wire from the motor to pin 10 of the black plug at the rear of the control unit. If that is not the case, then that wire is grounded instead of being floating when the switch is in the off position.
Let's go on from there. I would then remove the black plug and on the plug side measure the resistance between pin 8 and each of the following pins: 3,2,4,7, and verify that you get increasing resistance values. That would prove that the resistor block is working: if not then the coils are touching or something is wrong with the wires from the block to the plug. Then on control unit side I would measure the continuity (that there is 0 resistance) between pin socket 6 and each of the following in order as you move the switch from off to high: 7,4,2,3,8, and that there is infinite resistance when each of the pins sockets is checked when the switch is not in its respecitive position.
If that doesn't prove out, then the switch is bad internally.
Let me know what you find and we can go from there.
Roland
