The blower motor resistor can be defective yet all 4 fan speeds will still work and move some air. It will move a lot more air after you replace the resistor. It's a common problem on Dodges and is very easy to replace it yourself. Get the new design resistor from the Dodge dealer, the ones sold at retail parts stores are the old design. Dodge recently re-engineered the resistor packs with much better and longer lasting parts. You will see when you compare the old part to the new one.
The water in the floorboard after using the AC is probably due to the condensation drain being plugged. Get under the truck and you will see it low on the passenger's side firewall. The drain sticks straight out a couple inches. Use a coat hanger or a stiff piece of wire, etc to poke in there and clean the drain out. Check at the dealer to see if your truck is in the recall to add a right-angle hose to the drain so it will drain better. The straight drains clog up because at driving speeds the water can't drip out like it should. If you are not in the recall, buy yourself a right angled hose at the dealer or the parts store and slip it over the drain tube, pointing down so the condensate can drain out like it should. You might want to pull the carpet up on that side and dry it with a heat gun on low or a hair dryer to keep it from getting mildewed and moldy. It smells pretty bad when that happens. Or just pull up the carpet and let the truck sit with the windows down in the sun for a few days to dry it.
Jimmy
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Never be afraid of anything smaller than you.
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