brake leak

[blake at clockworm.com (Blake Irvin)]

at the advice of a mechanic i got together with a friend with a floor  
jack and stands and put in a new master cylinder ('90 corrado, thank  
for that suggestion) - bled the brakes, and stopping power is  
significantly improved - however, i still am leaking a bit of break  
fluid - after a 20 mile drive, then parking the car, there is a  
puddle about the 4 inches across the next day.

the leak is somewhere in the engine compartment - any advice on how  
to track it down/where to look for the leak?

also my heater blower/AC stopped working at the same time - i think  
it might be the 5-position switch - ideas?

thanks

blake/