What is making your 1990 BMW 735i overheat new t-stat and fan clutch from BMW?

Answer 1

make sure the system is bleed out you can do this if u have a radiator cap with pressure relieve valve just let the car get to operating temp and release the valve if it is sputtering out coolant and steam it is not properly bled and after it has cool down. pour more coolant and repeat till you get constant coolant running out. and if you don't have a pressure relief radiator cap their should be a bleeder screw on the thermostat housing and you would do the same the above. and if that doesn't work that mean that the passages inside the engine could be blocked take garden hose pour water from the top radiator hose (disconnect from the bottom too ) and pour water till it is comin out clear and do it vese-verse and make sure temp senor and Temp swicth are good i told you what i know so be care full

Answer 2

Many things can make your car over heat. I would check your water and oil levels first. Then i would look towards your cooling fans,Water pump,and Head gasket.