i am owner of cultus vxli 2010. i was facing heatup engine problem in 2011 and 2012 in summer. i visit suzuki township motors suzuki sethi motors suzuki cantt motor and suzuki adil zafar motor in lahore for this problem and every visit i pay 5000 rupees for different parts and service. almost i pay 30,000 rupees. but every one say me that"abb car heatup nai ho gi" issue was "car work well with A/C in city but heatup on long way " what the car mechanic did. (radiator service,radiator cap change, water pump fan chang, coolent change, radiator fan direct,engine gas kit change,AC service,AC gas fill,) but the problem was not solved.and they said that sold the car. i love my car and did not want to sale. finally i change the radiator form a machine suggestion. i buy allwin radiator in 5800.and put it in my cultus. next day 27 june i visit lahore to multan on high way day time. it was hot day. i drive car at 100 k/m speed and A/c on. the car engine was cool. after 2 day 30 june i visit lahore to islamabad via motorway. and speed was 100+ and engine was cool. i was happy that i solved my problem. my car problem was radiator nali was closed and did not crossing water in these nali. if the car do not loss the water level in radiator and the radiator fan is direct working and you car heatup then it is radiator nali problem. if car loss water level then its radiator leak problem.