Overheat? Check Thermostat | Multicab | Suzuki | F6A

Can you put a thermostat in wrong?
If you installed the thermostat backwards, it would probably not open
up enough to allow coolant to flow, and the temp gauge would shoot up
into the far right range, the engine would overheat.

If an air pocket gets trapped under the thermostat it will not get hot
enough to open at the right time. Air does not conduct heat very well.
Air bleed or the little hole in the thermostat allows the air to escape, it's important that thermostat is properly installed.

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