Hyundai Accent Problems

The Celerio is fine for that sort of use and the price is very good, but if it was my sister I'd get her to spend the extra on the added size of the Accent and the five-year warranty.

If the increase in running temperature is only small and there is no loss of coolant there is probably nothing to be worried about. It could be a slight blockage in the radiator that’s affecting the coolant flow, a sticking thermostat, or something like that. You could flush the cooling system, check the thermostat and replace the coolant. If you replace the coolant make sure you use the correct coolant, which will be a mix of water and glycol.

You must expect the boot to become warm to some extent, but it's unusual that it becomes hot. I would measure the temperature it reaches and then take that to the dealer and discuss the issue with them. If it is getting hot there must be something causing it, and that needs to be found and fixed.

Go back to the dealer and ask that Hyundai's representative take a look at the car and work out what can be done to fix it. It's not acceptable that they wipe their hands of the problem.

I doubt the caliper needs replacing, but a closer inspection is probably warranted. Accumulated brake dust was a reasonable assessment on the dealer's part, even though you couldn't see any dust on the outside. I'd inspect it again, blow out any dust found, and check for stones caught in the caliper.

I can’t possibly predict what might or might not happen to the belt in the near or even medium term, so I would have the belt changed.

Using the silicon spray would reduce the noise for a short time, but the effect would soon wear off as you have experienced and the noise return. Try scuffing the surface of the pulleys with a fine grit wet-and-dry paper and then fitting a new belt. If that fails to quell the noise, fit a new alternator pulley. Also make sure the belt is tensioned correctly.