The Stovebolt Site Forums The Shop Area General Truck Talk Why does my truck hate thermostats?

I guess it may depend on the brand of thermostat you are using.

Generally if it has a small coil spring on one end, the spring is wrapped around the sensor and has to placed towards the engine.

Some thermostats are made a little different, but the larger end usually goes towards the engine, and the flatter end towards the radiator.

Might help to know what brand thermostat you are using.