Changing the coolant in a 5k is a pita plus long rant

[cobram at juno.com]

Suggestions and comments on this thread are all good ideas.  Now that
it's summer, just fill with water, drive around with windows open and
heater on, dump water and keep doing this until what you get out is
pretty much clean water.  Then run a flush through, and do the same thing
until you're sure all the flush is gone and you're back to "pure" H2O. 
Dump from bottom rad hose and fill with 100% good ole green, should take
about a gallon.  The block and nooks and crannies hold about half the
coolant, even with the bottom hose off.
I recently had to do this to a (non-Audi) that had that evil GM
"lifetime" coolant.  If you don't do this and mix regular Anti Freeze
with that crap, you end up with Blob like clumps in the cooling system.  

Lately I've been using universal coolant for top offs etc, I'll have to
check the drum to see what it is as I've been "borrowing" it from a
friend who works at a place where they buy the stuff by the drum.  It's
clear and supposed to be compatible with ALL coolants, so far so good. 

Many moons ago I pulled an engine from a 5KS that was heading for the
boneyard.  After a week on the engine stand, spun it around to pull the
oil pan....and about a half gallon of antifreeze all over the floor. 
Seems I5 blocks are to coolant what chipmunk cheeks are to nuts....  ;-)
 
BCNU,
http://www.geocities.com/cobramsri/
Some days you're the dog, some days you're the hydrant