Where is the thermostat located on a 1990 c20 Chevrolet van?

On a 1990 Chevrolet C20 van, the thermostat is located in the engine compartment, specifically at the engine's intake manifold near the water pump. To access it, you typically need to remove the upper radiator hose connected to the thermostat housing. Once the hose is removed, you can unbolt the thermostat housing to replace the thermostat. Always ensure the engine is cool before attempting this to avoid burns.