dually problems

[magnethead]

ok, we last drove the dually about 2 or 3 weeks ago to town. My mom starts it up today to take me to school, and it started smoking. I drove it home (i have my permit) and it didnt do anything when I was driving, but the second i took it out of gear and put it in park, a whitish smoke came out of the left side of the hood with a foul odor (like something was burning), and it stopped when i turned the ignition off. I initially thought maybe transmission (TH400), but no smoke came out from under the running boards that I could tell. I lifted the hood, stuck my head in, and sniffing around, it seems like the brunt of the smell came from the waterpump/mechanical fan area. Driving it home, i hadn't thought of even glancing at the water gauge to see if it was hot. I went ahead and parked it on asphalt, if it leaks fluid, i'll know. Any ideas?