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If you look at the bottom of the thermostat you will see the spring wrapped around the valve that goes up & down to open & close the thermostat. The spring is made from heat sensitive metal and is what opens and closes the thermostat as it expands & contracts. If the thermostat is installed upside down, the spring will not be in the coolant and will not open until it gets hotter than the specified temp of the thermostat and could cause overheating problems and coolant flow issues.

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Q: 8 What would result if the thermostat were to be installed upside down Why?
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