Dinner plate size puddle under the car that is orange/pink in color and eventually dries so I'm assuming it's coolant. Any idea where this leak could be coming from when it's dripping off the front diff? It's a 2001 1.8T B5 A4 Quattro. Please see pic.

I do not have the same model but when I bled the coolant system via the Heater hose outlet hole that goes into the firewall (for the heater core) it drips out and down in that area. If the heater hoses are intact the heater core nipples could be cracked if it is dripping there. If it is dripping there then look down below the hoses and you will probably see that it is still wet... if not run the car and see if it is wet there.

I was searching before I posted my reply above to see if the heater hoses were located similar to my car and found this... http://www.passatworld.com/forums/b5...placement.html - don't know if it will help but it mentions the drip is off the differential. The article relates to a Passat but they may be similar.

Can you get a pressure tester? A lot of auto shops rent them.
They have saved my life enough that I went and bought one myself.

Thanks for the suggestions, all! I'll check on the pressure tester.