Cooling problems

Dear people Obviously this is a peculiarity of my new achievement (well, neither nue nor… ) from Toyota had to switch to Ford Escord 1.6 16V CLX petroler, since father rust has nibbled up the Japanese. Since I have the thing – problems !! After approx. 100 km – off. Diagnosis according to mechanics cylinder head dichung died, since something with the cooling control did not work. Instructions from the mech. after the return : “Keep the temperature indicator in mind”! Hab ́das brav gema cht for approx. 100 km – everything ok! BUT the coolant still “cooked” on arrival – and then a puddle was created under the car. – Water pump ? I would like to check the whole thing, or to renew some parts. But am not sure already when looking for spare parts, what kind of model do I have Mk6 or 7 ? According to the car ID the car could have been built March 94. Can someone please help me there first and then possibly because of the techn The “repair book” I already got, but it’s always very new to me. Thanks Wilhelm