Audi 90 Heater Core ???'s

[Hpfarfan at cs.com]

I really, really, really need help/info on replacing a heater core in an 1988 
audi 90 (5cyl, fwd).  I would greatly appreciate a detailed or somewhat 
detailed instructions on removing the heater core.  I don't have the Bentley 
Man, so anything that you guys/girls could provide would be greatly 
appreciated.  I go to school in Binghamton, NY and they said it should snow 
on Monday and be very cold.  I really need to get this done asap, please 
helpppppp!!!  

Thanks in Advanced 
1988 Audi 90 (5cyl, 5spd, Fwd)