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I removed the thermostat from a 1993 Nissan Maxima but note which way was to be inserted back in housing?

The thermostat in a 1993 Nissan Maxima should be installed with the wax pellet or spring facing the engine. This is because the wax pellet or spring expands and contracts with temperature, which opens and closes the valve in the thermostat to regulate the flow of coolant through the engine. If the thermostat is installed incorrectly, it will not be able to properly regulate the engine's temperature, which could lead to overheating or undercooling.