Does your garage have any windows? You could try reflecting the sunlight on to the floor and using it as a thermal mass. Although it does get cold enough here (high 20s) to wear a jacket in the garage, the bigger problem that I have is cooling. I would love an air conditioned garage. Our water heater and our car engines both provide some waste heat for the garage.
I was thinking about your radiator idea. One thought that I had is you could put the radiator inside with a fan and then treat it more as a forced air system. In the summer, you could add another radiator outside and cover it with cloth. Add a constant drip to the cloth an basically make a swamp cooler. WI may not be dry enough though.
I am assuming that your garage is already well insulated.
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