I've looked into the same thing for my boosted sleds, but having a water pump on the sled will tax the electrical system that much more, especially finding one that can move enough water to do the job. Be careful what pump you try to use, and the additional electrical load you put on it. I've looked into the Laminova style coolers and a small hose mounted pump, but couldn't find one I'd trust that doesn't have a higher current load. If you have too many other gadgets on it (WB, heated shield, etc,etc,) you could be pushing the limits of the system.