2002 dodge grand caravan - 50k mi. bought it used 6 mnths ago, have used a/c & heat with no problems. Recently - the blower (fan) only works on high - no other settings. Any air lines I need to look for - if so - where should I look - not wanting to completely tear dash apart.

I would have to say it's the switch on the console, possibly the wiring from the switch to the relay maybe?

Someone would need to check the blower motor and the resistor for voltage and ground.

Sounds like one of the vacuum doors under the dash are not working right check the doors and check for vacuum leaks in the hoses or the door actuators malfunctioning

http://en.allexperts.com/q/Chrysler-Repair-807/2003-Dodge-Caravan-blower.htm

blower resistor went bad causing only high speeds, "resistor" makes it slow down, maybe not all the same problem though. check fuses

the heat or cold adjustment control in my 2002 grand caravan will only work on maximum adjustment, if you try to reduce the speed of the blower by turning the control knob 1 knot, 2, 3 and 4 down it won't work it only work at the last position which is the 5th or last turn of the control knob. please let me know what could be the problem. thanks.

If you are looking for the fan blower resistor, it is located behind the glove box. No tools need to get to it and a nut driver to remove the 2 screws to replace it. A 20$ part.

need heater blower resister that controls blower speed.

2002 Grand Caravan. The rear heater also has a resistor for the fan speed control.(3 speed) It is located under the rear passenger side plastic cover. You can take off the rear tail gate lower plastic piece and this will let you pull out the side panel. You can reach in and take out the two screws that hold in the resistor and unhook the wiring adapter. You do not have to take off the whole side panel as you can reach in from the back. The resistor unit can be bought at you local dodge dealer.