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Would you mind showing some data to back up this 3A claim? I am a bit skeptical of that because computer liquid cooling systems typically use ~1.5A pumps, and a 1.5A pump used for a relatively low restriction loop such as a car cooling system would be pumping something like 1.5 gallons per minute max. A 3A pump wouldn't be able to do much better.
I'm not saying that a Metro engine needs the same cooling capacity as a 7L chevy V8, but I imagine flow rate is somewhat important in car engine cooling.
The reason I am concerned about the extra electrical load is the life of the battery is shortened if you're drawing more power from it. I think we all agree that it's best for as much of the engine's power as possible to be going into driving the car rather than accessories.
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