Gotta question when the car is cool and i look at the coolant reservoir the level is between the low and the full mark but when the car is at normal operating temp the level of the coolant goes like a thum and 1/2 up the full mark why is this??
is this normal i want to know the explanation?
thanks

 

Engine coolant expands when it gets hot, so if you filled up your radiator, and without anywhere for the coolant to go when it expands, it would blow out somewhere from the pressure. So when the car warms up, it pushes coolant into the resevoir as it expands, and when it cools and contracts, it pulls it back out and into the system.

 

thanks for explaining it so i assume its normal?

 

perfectly normal. Check your coolant level when the car is cold at the radiator cap. This will give you a better indication on your level. Always make sure you see coolant at the cap. And if you don't, fill it up to the top, and if you overfill, it will be pressed into the overflow.

 

thanks