Experiences Arosa 1,0l

Hello, think about buying for my sister an Arosa 1.0 base 8/1998 with ABS with 82tkm for 4,100€ (dealer). What do I have to bear in mind when buying? How expensive is the soon due timing belt change? What have you done for experience with motor/gear? These engines have a problem with the “freezing” in winter during spa track operation. Is there anything retrofitted by VW/Seat on Kulanz, or do they only act in case of damage, as a Seat dealer told me? What does the 1.0 ltr. s consume? o on average (does a lot of highways run at 100 km/h)? Are there typical weak points? I am grateful for every answer! Greetings, Andy