u/deeo2468

as you can see i point the laser on the thermostat housing. the side which has the hot coolant interacting with it at all times is showing 70°C. The side which only has coolant flowing thru it after the thermostat is open is showing 30°C cooler. This was after a 30 minute drive on a warm night so it definitely should've opened, which would've made the temperature much more similar. The block temp was 90°C.

The thermostat was tested in stovetop boiling water before we installed it and it did open.

I think this means its stuck closed, its at 47°C probably because of ambient temperature.

Please let me know what you guys think.