Recently heater fan would only operate on one speed. After searching this website, I followed Andrew B.'s instruction and problem was easily corrected. The fan resistor was the problem. Local Dodge dealer had the part in stock for about $25. Local auto parts store could not get the part because the supplier was out of stock--price at local auto parts was about the same as the dealer had the part been available. Andrew's directions were great. I had to remove the glove box door (very easy to do, no tools required). I went to the dealer to get the part because I wasn't sure exactly what object behind the glove box door was the correct one. After seeing the new part, I readily identified the existing one. As Andrew said, the back side of the new part looked different than the existing one, but the front side was the same and it fit perfectly into the old space. Thanks Andrew!!

Particularly annoyed by only having one fan speed being that this occurred two weeks after I bought the van used.

Fortunately I had the same experience with a 2001 Caravan and knew that it was the fan resistor. It is an easy fix to do yourself, I did it in the parking lot of the dealer with a pretty small socket set. The resistor is in the firewall. If you open the glove box fully you are looking right at it. Unplug it and take out the two screws and it pulls right out. The replacement one may not look exactly like the old one; they seem to have made some design changes. Definitely don't pay them to install it, it's not worth their minimum charge. You'd be better off putting that money towards the socket set.