If it is anything like my 1998 Nissan Frontier 4-cylinder, then it is located on the engine block side of the bottom radiator hose to the top left and in between all of the belts. I am currently changing out my thermostat b/c of engine overheating problems. I had to remove the plastic around the back of the radiator, then remove the fan to have access to the bolts on the engine block that hold the metal thermostat housing on. I don't know a lot about engines and this is a new venture for me, but it has been a lot of bloody knuckles. If you have the right tool it might be easier. In the 98 you have to seal it with silicone. I had to come to work this morning and didn't finish the job yet, but I hope to finish within a few minutes since I have everything undone. I looked all over the internet trying to figure out the location of the thermostat because Nissan didn't provide me with any book explaining how to do anything(change headlight, etc.). I hope I could be of some help.
The thermostat on a 2001 Nissan Frontier 4 cylinder is located on top of the water pump. The thermostat can be found by following the upper radiator hose.
The 2002 Frontier thermostat is located in the thermostat housing. The housing is the connection for the top radiator hose.
The 2001 Nissan Frontier coolant temperature sensor is located on the front of the engine. The sensor will be a few inches above the thermostat housing.
Follow your top radiator hose to thermostat cover,remove 2 bolts holding cover on.
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A Nissan Frontier may be overheating because the radiator is cracked. A thermostat failure can also cause it to overheat.
My 2001 Nissan frontier 3.3 v6 engine is overheating. I changed the thermostat but it still overheats.
4cylinder 105-112 foot pounds v-6 65 foot pounds
The 2003 Nissan thermostat is located inside of the thermostat housing. You can follow the bottom radiator hose directly to the thermostat housing.
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With the spring part inside the engine