Spring first into the engine.
in
A thermostat always goes in spring side toward the engine.
The spring goes towards the engine.
The thermostat spring always faces the engine block and not toward the radiator hose.The spring end of the thermostat faces into the engine.
The spring goes down into the engine.
Thermostat Spring always goes towards the engine
Normally spring down.
Spring side down, to the engine
Spring down.
Down
The spring goes into the engine.
spring down