friendly advice,just take it to the expert,bring your car to a good mechanic to make sure that your car doesn't have any other problem.Since you're telling that every two days you are refilling with coolant,maybe there's a leak on your radiator,it happens to my car before and when i bring my car to a mechanic,it was fixed and no need for me to buy a coolant everyday.Besides,it will avoid you also from any other problem on your car if an expert will do it.....