heating systems

This started after an intense day of mudding, followed by 11 days of shoveling my Mounty out. I got home and pressure washed the bottom for an hour trying to get all the mud(clay) out (still some there after a month later). After that my heat stopped working. It blows out very cold air. if I try...

We have two Explorers, a '98 and an '06 that we got two months ago. While the '06, in mild weather, starts to produce heat within a couple of minutes of startup, it never really gets hot in very cold weather (below 30ºF). By contrast, our '98 takes a little longer to start producing heat...