Why does the AC-Heater blower fan only work in the high position on a 2001 Dodge Grand Caravan?

Answer 1

sounds like a bad resistor block.

you need to replace the blower motor resistor. It costs 20 to 30 dollars. This is easy to do, but the reason it is blowing resistors may be that the blower motor is starting to fail or just overheating. To replace the blower motor in the front of the vehicle requires the dash to be removed on a 2001. A very poor design. 4to 5 hours in a shop $$$$$$$.

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Easy fix. (1) Drive to nearest large auto parts store; (2) Buy a blower fan resistor for a 2001 thru 2007 Caravan (costs about $20 at parts store and about $50 at dealer); (3) Drive home and remove keys from ignition; (4) Grab flashlight and small socket wrench set; (5) Open front passenger door and knell on ground; (6) Open glove box & take everything out; (7) Press on sides glove box and allow it rotate down (everything would have fallen out if you had not removed the contents; (8) Shine flash light into open hole where glove box was and look for thing about the size pack of cigarettes that has two wiring harnesses connected to it (one large and one small connector); (9) Remove connectors and remove two screws holding in resistor; (10) Screw in new resistor and plug in connectors; (11) Put stuff back in glove box; (12) Test the fan at all speeds.

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I discovered my fan motor resistor block (as described above) had an open diode causing the problem. I soldered in a 30A 50V dual schottky diode in its place (about $4 at the local electronics store). You can touch the diode each way with fan set to low speed to figure out which way to install the diode.