1995 A6 Quattro

Alright, heres the deal. Coolant leaks out quickly(sometimes), i have to put coolant in it about every 2-3 days. Very little white in the oil, visible leaking on front of engine around water pump. It steams a lot out of the back(when its cold). Today i filled it back up with coolant and ran the car for about a half hour, pressing the throttle in burst to heat it up. Today all seemed fine, no visible leaking, checked the oil, no mayo in oil. I am super confused! Also resevoir is very pressurized after it runs for a while. There is also a clicking/sloshing noise coming from water pump area. And not to sound like an idiot, but is there a damn radiator cap on this damn thing?