This is something you can command the car to do via the menus. From the touchscreen, find the menu for the car’s functions, scroll through until you find the relevant section for the mirrors and enable the self-folding function on locking. That should do the trick.

Logic says it should be, since it’s part of the car as it was sold brand new. However, some manufacturers place conditions on this, mainly in terms of parts that are subject to general wear and tear. For that reason, tyres, brake pads and batteries are usually not covered by a new-car warranty.

Exceptions are also sometimes made for accessories fitted to the vehicle. But even if your TPMS was fitted as a genuine Haval factory accessory, GWM's (Haval's parent company's) warranty terms spell it all out pretty clearly:

“GWM Genuine Accessories purchased and fitted to a vehicle by a GWM Authorised Dealer are warranted for the remainder of the New Vehicle Warranty or 12 months from the date of purchase, whichever is greater. “

Put simply, even if the TPMS was considered an accessory rather than standard equipment, if it was a genuine Haval system, it should still be covered by the car’s factory warranty

A faulty transmission oil cooler, which uses the engine’s radiator and coolant, could definitely mix oil with coolant. And while that could lead to overheating as the coolant fills the transmission, you’d also probably notice the transmission dying a not-so-slow death due to coolant polluting the lubricating transmission fluid. But it’s less likely to pressurise the cooling system to the point where the oil-and-water mix exits through the expansion bottle.

Much more likely is that the coolant system is being pressurised by the combustion of the engine. If the cylinder head has been checked and the gasket replaced (assuming it was all done properly) then the pressurisation is probably coming from somewhere deeper in the engine’s crankcase. You need to check the cylinder bore for splits or cracks and take it from there.

Before doing anything, though, check the date of first registration of your car. If it was first registered after October 1, 2018, then it is covered by Haval’s seven-year/unlimited-kilometre warranty. If it was prior to that, then it would have come with a five-year/100,000km warranty which, technically, will have expired. Even so, it would be worth contacting Haval’s local customer service division to see if the company is open to helping with repair costs given the vehicle is only just out of warranty. This presumes, of course, that the vehicle has been serviced correctly and at the appropriate intervals.