If you are only worried about overheating while idling, I'd just rig up a water sprayer to inject mist on the cylinders. If there is any fear of shock cooling, you could take the slightly less efficient route and spray mist into the cooling intake air.
This would work especially well in dry, hot climates common in the southwest. It would probably work, albeit less efficiently, elsewhere in the United States.
- LostCause
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