I know they have a wheep hole that allows the coolant to start leaking out letting you know the pump is going out, but does this mean the vehicle shouldn't be driven until a new pump is installed? Mine has gone from no noticeable leak, to a 12" diameter puddle of coolant on the ground that develops about 30 minutes after shutdown. I'm just concerned the pump is going to suddenly fail and the engine is going to pump all its coolant out within 2 minutes going down the road. I went ahead and had a new pump overnighted so my buddy can help me install it tomorrow morning. It's only been leaking a few days I park in the same spot everyday, but it's definitely getting worse. Kind of a bummer I had to spend $45 bucks on shipping to get it here, but I don't want to ruin my engine, this truck is my only vehicle. The truck is a dodge ram cummins diesel, looks like my profile signature isn't their anymore.