salam,
coolant nikaal dien.
simple paani mein issay mix karien aur pani bhar dien radiator mein and cap close ker dien, gari start karien and temprature needle beech mein janay dien, aur saath heater bhi on ker dien takay heater CORE bhi saaf ho jaye, phir gari band ker dien and achi tarhan thandi honay dien, paani nikaal dien sara and taaza coolant daal dien.
new coolant daalnay k baad hawa achi tarhan nikaal dijyea ga gari ko agay say jacka say utha leina bulbulay nikal jaien *** phir radiator cap band ker dien