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Necrobump!
I'm looking into something like this for my Neon. Most of my drives are under 4 miles and between 8-16 hours between drives. Obviously, my engine is back to ambient temps by then, so I'm thinking something like this may be a good way to go.
I have room in my engine bay (since I use a smaller radiator and smaller battery) and found a stainless steel canister that should do the trick.
I'm thinking of getting a Saab coolant bypass (a Y type) that would tap into the heater line. Shortly after, tap in with a T for the return. This would make it pull from the engine and push into the heatercore. Use a cheap and simple 12v vacuum pump to open the bypass valve from a switch and a basic 12v water pump off the same circuit to pump the coolant through. Use perhaps Styrofoam for tank insulation? This would have to all be done manually with a push of a button, but I'd trust that more anyways (and would be far easier and cheaper than trying to put something automatic together).
Any thoughts on something like this?
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