With my 2019 LDV T60, I am getting very close to red in temperatures when towing a camper up any long hills. Do you think a different coolant or is a better fan needed?

Coolants are pretty specific these days, and straying from the exact one the car’s manufacturer specifies can be asking for trouble. But the fact that the temperature settles a little when you travel more slowly and shift to a lower gear suggests that the whole cooling system is getting towards the limit of its capacity when you’re towing a big load uphill.

Going slower and using a lower gear all takes stress off the engine and, therefore, its cooling system. By using a lower gear, you’re effectively making the engine turn over a little faster which means both the coolant pump and the cooling fan (if it’s a belt-driven one) will both turn a little faster. That’s good for cooling. A lower gear also means you can maintain your speed with a little less throttle which means less fuel going into the engine and therefore less heat generated.

In the meantime, you can check things like the tension of the fan-belt and make sure that the coolant system doesn’t have any air trapped in it which can lead to overheating. Check, too, the condition of the coolant hoses, that the electric fan is cutting in when it should, there’s no debris blocking the radiator and that the radiator cap is holding pressure.

There’s another old-school trick that might make a difference next time: When the temperature starts to rise on the gauge, turn the car’s heater on full blast. This will make things a little toasty in the cabin, but it also means the coolant is now also passing through the heater core which, fundamentally, is an extra radiator.