Please help, I bought this 93 geo tracker about a month ago, I went ot hop in my truck this morning for class, hopped in, kinda felled something bad.. let the truck warm up, them turn the heater on.. OMG i had to take the bus to school...

I think something died in the heater core, or in a air duct..

whats the best way to remove the heater core ? I need to get this "thing" smell outta there... Please help

Check the fan.  It is located under glove box.  3 screws and you'll see if there is any rodent, perhaps a mouse or 10. 

Speaking from experience.  I parked my Tracker for 2 years.  When I got it back on the road the duct work was full of nasties, and 10 dead mice.

thanks for the head's up