2016 Mazda CX-5 Pricing and Specs

The overheating is far from a mystery: Any time the coolant level in the radiator and cooling system drops below a critical point, there’s simply not enough coolant remaining to effectively cool the engine. So it gets hotter and hotter until it overheats.

The bigger question is why the coolant is leaving the radiator via the coolant recovery tank. In many cases, this is because of pressure from the combustion process finding its way into the cooling system. In turn, that’s very often caused by a failed head gasket which is allowing the combustion pressure into the coolant passages inside the cylinder head and crankcase.

The head gasket not only keeps combustion pressure (the result of the air and fuel being burnt in each cylinder) inside the engine, but also separate from the cooling system. But a failed gasket will often allow the pressure and the coolant to mix, at which point the pressure overcomes the pressure inside the cooling system and the coolant has to go somewhere. Generally, that somewhere will be the recovery tank as this is where the coolant goes in the normal course of its expanding as the engine heats up.

There’s a quick, simple chemical test that a mechanic can carry out to confirm whether the head gasket has failed, and this would probably be your first step. And don’t be tempted to continue driving the car and simply topping up the coolant. This type of leak can get a lot worse very quickly, and overheating can destroy an engine while you watch.

The Trax is good value for money and stacks up well against all comers in the class. The 1.4 turbo is the best engine, and it has a conventional auto instead of a CVT that most of its rivals have. Others to look at are the Suzuki S-Cross, Ford Kuga, Nissan Qashqai, Mazda CX-5 and Subaru XV.

You have clearly done your homework, from which you should be able to decide which is best for you. Without knowing what your needs and wants are all we can advice is that the three cars you have honed in on are good choices.