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Figgy, Only cases of overheating I've heard of involved dealerships replacing coolant and not properly bleeding the system leaving air bubbles in. But I've checked after driving on a 115 degree day with the air running hard. Pop the hood and there was not any pressure on the coolant hoses (you could squeeze them) which means it should be safe to remove the radiator cap (I don't recommend this though).

But I think you'd have to have something pretty major go wrong to overheat the tiny little engine. Heck, I can drive it until it shows operating temp at 6 bars, turn the heater on in our "winter" and it will suck enough heat to bring the engine back down to 4 bars. I deffinitely understand why you guys in colder areas cover your radiators.
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