Sounds like the cooling system on the vehicle needs to be bled correctly. As the engine gets warmer, the coolant level will rise. Bubbles in the engine block may only be able to escape once the thermostat has opened, allowing the coolant from the block to circulate back to the radiator.

The halfway point is what’s called “normal operating temperature”. This is the temperature your engine tries to maintain while it runs, and is completely normal.

You don’t want your temperature gauge to creep up past this point. You’ll only see this happen when your vehicle is overheating.

Some people put them in a pot of boiling water with a thermometer to see if they open and close as expected.

There are many things that could cause your vehicle to overheat. The thermostat is one of them. Check your coolant level to make sure you have enough coolant, and bleed the cooling system to make sure you don’t have any air pockets trapped anywhere.

Thanks very much i am having the exact issue with my Car and thought its the Radiator, but after Mechanic checking the car he found out it is Themosart