Originally Posted by
strokersace
That sounds about what mine's doing. Except I don't have a huge puddle. And mine lost some coolant when driving cause it was full when I checked it before leaving the other day. Then about 1/2 thru my trip, I popped the hood after several hundred miles and it was down in the coolant tank. And you could see where it had been splashed on the front of the motor. Doesn't seem to be making a puddle after parking either.
The only time that coolant will be drawn from the coolant tank is when the engine is cooling and a vacuum is being built up in the radiator. This sucks coolant from the tank into the radiator to maintain the level in the rad. If you are loosing coolant from the tank while driving, you have a leak somewhere other than the water pump. Good luck with the diagnosis. Sometimes they can be a pain.