Okay so i have a 1989 750iL that i acquired from someone. It ran fine for a while but my dad started noticing some problems. He found out that i needed to change the water pump. We changed that then heard a loud ticking noise. changed the tensioners now sounds much better. But the car runs really hot. THe person who gave me the car said that it usually ran around 1/2 but now it runs around 3/4 sometimes more. Any ideas on how i can fix this or what could be wrong? What type of coolant should be used? thanks so much.