My car does not leak coolant but the coolant does evaporate somehow and I have to fill it about once every two weeks. I have taken my car to two mechanics and neither of them could figure out the problem. they both said that the radiator is fine and not leaking. If i drive in the city my car is usually fine, but if i go out of town the engine overheats. i pull over and there is no coolant in the car. Does anybody here know what this could be? Iam thinking about having the radiator replaced. the car is a 2001 civic

 

well... it has to be going somehere... is the passanger side floorboard wet? also, look at your oil, does it look odd, kinna milky?

 

are you sure its not leaking like you poped the hood and looked around because my honda didnt look like it was leaking eather, the ground was drie ( some how ) and then I poped the hood looked around abit and found lil pools of coolant. it was spraying out all over the engine and fan and I didnt even know, so know i think i need to replace my radiator.

 

It could also be a blown head gasket. How does the oil on the dipstick look? If it's milky, the head gasket needs to be replaced.