>> I wonder how this would cause a fire.
It sounds similar to a Ford Sierra I once saw catch fire. Pulled up next to it in the car park of the services off the M6, and initially thought it was just overheating, but then realised it was smoke, not steam coming from under the bonnet. As I moved my car away from it, a fire crew turned up and quickly put out the fire. One of the fire crew said he'd seen it before with certain cars. The plastic engine air intake laid over the top of the engine, coming from the air filter to take air in from the front of the car through the rad grill. Due to heat soak, the plastic could deform and subsequently come in contact with the hot rocker cover. The plastic becomes hotter and hotter, to the point of combustion.
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