Cadillac Seville STS Coolant Leaks From Water Pump and Radiator

I have 99 sts cadillac. Haven't had too many problems. had everything check out about a year ago when i first our cased the car. Just recently i pulled my car out to find some leakage on the ground. Shortly after i noticed that my car started to over heat. I put in antifreeze and it helped for a few hours and now its back to over heating.

After replacing the belt, the resorvoir started leaking the coolant. After a short drive, drops all the coolant like it has a hole.

Year ago replaced my water pump. Only went back and forth to work for the year (50 miles a day), but did one small trip (400 miles total)where I experience car message Check coolant level and than overheating, refilled reservior and went on my way. Now about to go on second long trip when experience the same issue (check coolant level car overheating, drove 134 miles and back same miles with coolant top off. Took into shop and was told water pump is leaking and the radiator was shooting out coolant at the top on the passenger side of the radiator. Shop (non cadillac shop,Goodyear)says they'll replace the water pump again (part will be free, $200 labor) and they will replace the radiator ($250 for the radiator and $300 labor).

bought the car assumimg it had a computer problem and come to fine that the car has a few problems dash was displaying low coolant, car overheating and drove the car for a week and now the mechanic is saying that the engine seals were blown and are banging out my warranty to rebuild my engine. do you think i'll have more trouble than i bargained for cause im feeling dooped.

Water pump gasket leaked very slowly. Replaced water pump gasket and has been fine for years.