This turns out not to be a problem, because the engine runs cooler on LPG. The gas leaves the tank in liquid form and has to be boiled into a gas. Its boiling

This turns out not to be a problem, because the engine runs cooler on LPG. The gas leaves the tank in liquid form and has to be boiled into a gas. Its boiling point is -40°C, and so the vapouriser is plumbed into the cooling system. This pulls a lot of heat out of the coolant. I regularly tow at the maximum permitted weight and speed with my LPG-converted Range Rover, and the coolant never gets above its normal 95°C even on the hottest day.