I'm having a coolant leak coming from the front of the engine and I'm pretty sure its from the water pump. It was doing this a short while ago and I replaced the water pump, but it's starting to leak again. There's also a howling/whining noise, could this be the bearings in the water pump wearing down? Anyway, what's a good way to check the seals in the water pump. I don't want to replace my waterpump if it's fine. Thanks.