The thermostat in an engine block is designed to regulate the flow of coolant into the radiator from the engine.
The degree designation (Ex: 185 Degree) refers to the temperature in which the thermostat will open.

A LOWER TEMPERATURE THERMOSTAT WILL NOT NECESSARILY LOWER ENGINE TEMPERATURE.

In some instances, a lower temperature thermostat can actually raise operating
temperature of the engine by not regulating coolant flow in the radiator.
For example, if a 165 degree thermostat is installed into an engine that normally operates at 190 degrees,
the thermostat will stay open at all times once engine temperature exceeds 165 degrees.

Thus, there is nothing to regulate the flow of coolant into the radiator.
Without anything to regulate the coolant flow, the coolant will pass through the radiator before
the heat can be removed from it creating an upward spiral in engine temperature.

Not Running a Fan Shroud can also cause for increased engine temperature.
Excess fan distance from your radiator can cause increase in engine temperature too.

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