I just bought a 2001 2dr blazer 70,000 miles. Although on my test drive i didn't realize the heater doesn't work. It blows air warmer than outside temperatures. Im not sure what all the possibilities are on problems. if any1 has had similar problems or ideas and could lend a had i live in ohio and its going be be cold here pretty soon so I'd like to solve this asap.

 

Sounds like your heater core is gunked up with dexcool. Buy a flush kit and try flushing the system out and switch to the regular green antifreeze.