Answer to: Where is the thermostat on a 1997 Nissan truck 2.4L engineI diagnosed a missing or open thermostat on my recently purchased Nissan XE by checking for water flow on cold startup. I saw that the engine was running cold. I look for the thermostat housing in a typical place, at the upper radiator hose connection to the block. By the size of the opening I could tell that the thermostat either had to be very small or located somewhere else . So I bought the thermostat before I did anything. The size of the thermostat verified that it would not go there. That's when I went online and found this site. So thank you for the information.