MUHAMMAD RAZZAQ

I HAVE NISSAN AD VAN/CAR. I CHANGE THE GASKET AND CHANGE RINGS OF PISTON AND HEAD IS CLEAN BY LEATH MAN. MY CAR HEATED AGAIN. AND THERE IS NO THERMOSTAT IN ENGINE. I CHANGE AGAIN ENGIN GAS KET 2ND TIME THE ENGINE HEATED AGAIN. PLEASE INFORM WHAT I AM DO NOW. ARE THERMOSTAT IS NECESSARY FOR ENGINE? . REGARDS RAZZAQ