Question about 1993 Nissan 240SX

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240z overheating how to replace thermostat / where is it located

Thermostat location?

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The round housing that chrisk speaks of has 3 bolts. The thermostat fits vertically behind the housing so when replacing I find it easier to line up if you put the bottom bolt in first, (helps keep the thermostat from sliding out of the groove it fits in and covering the bottom bolt hole. Also the surfaces are machined and no gasket is required, A small amount of silicone sealer would be a good idea.

Posted on Jun 18, 2009

  • Hal Hallman Jun 19, 2009

    I answered your concern as if it was a 240sx (shown in the picture), your post says you have a 240z, a totally different animal...made 1970-1973...which is it? The 240 sx is a 2.4L 4 cyl, and the 240Z is a 2.4L 6cyl 2 seater.


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Follow your top radiator hose to the engine...where it connects the should be a small rounded housing with 2 or 3 bolts it is under that housing

Posted on Apr 18, 2009


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Radiator overheating

I would replace thermostat. Cheap fix usually. The thermostat could be sticking closed. It is typically located where the top radiator hose meets the engine and usually only has a couple bolts and a gasket to worry about.

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There could be a dozen and one reasons for overheating, from under inflated tyres to wheel alignment to a blocked radiator or faulty timing, but here is the location for the thermostat and tips on changing it.
The thermostat is normally located in the aluminium elbow that the top radiator hose connects to. The elbow is usually held down by two bolts and it is only necessary to remove these to replace the thermostat. It may not be necessary to remove any hoses. Take care that the new thermostat is correctly located in its recess and the old gasketing has been completely removed and that the new gasket has a smear of gasket cement on it. While tightening the bolts, make sure that the elbow is seating evenly and not catching on the edge of the thermostat or you could crack the elbow.

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first look to see if anything is blocking the radiator on both sides that may be causing limited airflow. if nothing is blocking the radiator make sure the fan works. let the car warm up and wait to see if the fan turns on when it starts getting hot, but dont let it overheat. if the fan does work then it might be a stuck thermostat. the thermostat is located on the back side of the engine below the exhaust manifold. there is a downpipe for the radiator and there should be two bolts the you have to take off and the thermostat is between those two pipes. if the thermostat is replaced and you still have a problem with overheating it could be internal and i would suggest having it looked at as soon as possible. hope this helps and good luck! i had the same problem and mine was the thermostat. oh and one more thing, if you are going to change the thermostat yourself i would recommend putting the car on ramps at the very least due to the location of the thermostat. i had a lift which makes things a lot easier, but i think that ramps would do.

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The thermostat is located at the end of the top radiator hose where it connects to the engine. There is a thermostat housing there.
1. drain enough coolant to make the water level below the thermostat height.
2, Remove the two bolts that hold the housing to the engine.
3. remove the thermostat and scrape off the old gasket and sealant from the housing and manifold.
4. install new thermostat (point side UP)
5, use Permatex #2 non-hardening gasket sealant ($3 AutoZone)

More info to follow in my comments...

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