This was a long running model for Nissan (in fact, two models sold concurrently with the Navara badge, actually) so there were a few different engine options in the 2012 version. So here’s how it pans out:

If your Navara is the D22 version, it will be fitted with a version of the 2.5-litre turbo-diesel engine. As such, it will have 98kW of power and 304Nm of torque. If you have the D40 variant of the Navara, it, too, could be fitted with a 2.5-litre turbo-diesel, but in this case, it’s tuned for more performance and has 128kW and 403Nm.

But, there was also the option of a three-litre V6 turbo-diesel which had 170kW and 550Nm, as well as a petrol V6 measuring four litres and producing 198kW and 385Nm.

You might find that at high throttle inputs, the car’s computer is switching the fan on in anticipation of higher temperatures. Or, perhaps it’s the air-conditioning fan that is switching itself on to keep things cool, because you’re using lots of throttle at that moment. It could simply be that the fan itself is noisier when you spin it harder (in line with engine revs) and that’s what you’re hearing in the cabin.

If in doubt, make a note of this with the service department when the car gets its first service. Perhaps it’s not a fan at all, and the noise is the result of a poorly adjusted drive belt or a leak somewhere in the air-intake or turbocharger plumbing. Any small leak in the trunking that conveys the pressurised air from the turbocharger to the engine can contribute a range of hissing noises.

Either way, it should be a simple fix at best, and a warranty claim at worst.

If you check out a lot of used-car sites right now, you’ll see that a 2016 Navara ST-X can cost anywhere from $10,000 to $55,000. Why the huge price-range? Because there are so many variables with this type of vehicle. Frankly, I’d need a lot more information to make any sort of educated guess on the value of a car I haven’t even seen, so I’m not going to offer one.

Because this type of vehicle is often used off-road, its condition is crucial. If it’s been bashed up, you can take thousands off the price. Has it been a hard working tradie truck, towing a huge trailer every day? How’s the service record? What distance has it covered? What accessories are fitted? What’s its overall condition? Has it been heavily modified (A lot of Navara four-wheel-drives have)? Is it a dual-cab, single-cab? Is it fitted with a tub, a canopy or a drop-side tray?

Without all this information, it’s simply impossible to hazard a guess at the vehicle’s value.