Too hot? Use ice and water to remove heat from your body. A 12 volt pump moves cold water through tubes strapped to the back of a car seat, lawn chair or even indoor furniture. An ice chest of nearly any size can be used.
Within seconds of starting the pump you'll feel like someone dumped a glass of iced tea down your back!
Race car drivers use an expensive version of this with a heat exchanging t-shirt under their jackets to keep cool.
The parts cost less than $100. I've made these for classic cars, electric cars and for lawn chairs. They'll make you more comfortable if you don't have air conditioning and have to be in the heat.
Warning: Do not use for extended periods of time. Should not be used if you have poor blood circulation.
Step 1: Parts and tools
Ice Chest - any size, larger can hold more ice for longer cooling.
Plastic beverage bottles: At least two of any size. One to freeze and the other to use in the backcooler. I use two 1 liter pop bottles. Fill with fresh, clean water 2 inches from the top to allow for expansion. Remove the labels! The pump doesn't like label fragments!
10 feet of 1/4" od vinyl tubing: - get the drip irrigation tubing; it's tough, cheap and withstands UV
5 feet of 3/8" od, 5/32 id vinyl tubing: Usually clear, does not have to be food grade or reinforced.
3 inches of 3/4" id vinyl tubing: Clear - Size to fit your bilge pump outlet.
Two 1/4 to 3/8 reducer couplers: I used Eldon James C4-2.5NP
Two 3/8" quick release couplers: Optional
( Colder part number APC22004 and APC17004 from www.US Plastics.com)
Do not use drip irrigation fittings, they will leak when you move the tubing around!
One 12v submersible bilge pump, 350 gallons per minute for single seat, 500 gpm for a double.
One cigarette lighter plug with 2A internal fuse
3 feet of 12v 2a wire - Size to your needs
Two crimp connectors
One square yard of 1/4" nylon mesh or similar fabric, or a car seat cushion.
Two 6' nylon straps and buckles
UV resistant fabric
Heavy thread, UV resistant
3 small nylon cable ties
Drill & bits, 5/32"