Can someone please tell me where the coolant fill is on the block on a sc300? I had an sc4 before and it was right above the hose on the block but I can't seem to find anything resembling it on this one

 

On some cars, you just have to fill from the radiator and overflow tank. My BMW is like that, while my wife's chrysler has a cap just like you described, where the radiator hose meets the block.

Your owner's manual would say for sure, but I'd guess the radiator cap is the way to go.

 

Don't think I've ever done an engine block fill for coolant. Just fill the radiator and the overflow tank. Then run the engine with heater on HOT and high until engine reaches operating temperature. Let cool for about 10 minutes then open the radiator and top off. Check again after some driving.