Optima overheating

Hi,
I'm not familiar with your model. Old school here... The water is pumped from the engine block at the water pump, into the bottom hose of the radiator. The top radiator hose is the water supply to the engine, with the thermostat housing at the end of that hose, mounted to the engine. Check and see if your hoses are routed correctly and if you have coolant in your radiator.
Hope this helps. Good luck!