Having coolant drip right off the oil pan behind the a/c comp. is
standard proceedure for a 103 waterpump. The weez hole is impossible to see without a mirror and coolant rolls right down the top of the a/c bracket and then down the block and oil pan.
the coolant usually drips off the low oil level switch as well.
Later 104 motors got a nifty collection cup under the weez hole to collect any dripping coolant. This is visible from the top.
the pumps usually leak cold and seal up shortly after warming up, so pressure test it cold.
Don't forget to check the heater pipe o-ring at the rear of the cylinder head where the hose connects to the head.
That one will send coolant down the drivers side of the block as well.
Happy times indeed!