How would you like: Hot water to take a shower? Ice water on a hot day? Keep your beer cool indefinately? I got a plan!!!! And it doesnt use much electricity at all!!! The theory: Use the AC system to chill water. Use extraneious exhaust heat to heat water. The Practice: Use the AC line which is chilled and wrap it with 1/4th or 3/8th copper tubing, then insulate it from the engine compartment with foam. Depending on if you want ice water or if you want chilled beer, you will have to route appropriately, and also determine if you can close the system. For heat, using copper tubing again, wrap it on part of the headders (using more headers if you want to be efficient) Depending on how you want to use it, feed the water into an insulated steel tank. This will keep the water hot/warm long after the engine is turned off. Using inline magneto water pumps (20 bucks), these units draw very little power, and will circulate the water. Wacha guys think??? Questions? comments? I think I will try building this!!