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Anyone know of a small continuously rated pump that could be used for coolant in a car? The GTM has a bit of an issue with overcrowding of the tunnel towards the rear so I don't want to have to squeeze two more coolant pipes down there for a heater. Couple this with the fact that the standard pumps on front engined cars don't tend to cope well with driving coolant all the way to the other end of the car when the engine has been mid-mounted and I'm looking for alternatives. So a thought occured..... Many automatic cars have a heat exchanger in the radiator that they run the transmission fluid through. If I could source such a radiator that fits under the nosecone I could run a small closed system with liquid circulating through this heat exchanger and the heater matrix. I only need pipes to run from under the dash to the radiator where the tunnel is fairly empty. Problem is that means I need a pump to circulate that liquid. The radiator is brand new so no worries about contamination yet and therefore I can pretty much use the liquid of my choice - I'm thinking pretty much the same stuff that's running through the engine (maybe stronger or even straight anti-freeze). I don't see it wanting a massive amount of flow and small is obviously good. I had initially thought of a screenwash pump but I suspect it wouldn't last long if asked to run constantly when I want heat. Some jiggery pokery could no doubt make it run intermittently but I suspect I'd still be running it way beyond it's design spec and wearing them out regularly. I wonder about an electric fuel pump for a carb'd car. Any thoughts on how happy they would be pumping coolant instead of fuel? Maybe I could run a light oil in the heater circuit. Any other suggestions/thoughts? Iain
