A modding movement I hadn't heard about until I read this article: using automobile heatercores as DIY radiator for your watercooling setup. Very cool stuff.

"More specifically, the heatercore for the 1986 Chevette, Fedco part number 2-161 or GDI part number 399069, which is approximately 6-1/8" x 6-3/8" x 2". The factory tubes are 3/4" and 5/8" which require some modification to work with 1/2" ID tubing used in a watercooling system but this modification is not that complicated and well worth it considering that most auto parts stores have this heatercore for around $22."