Where is the thermostat located on a 1991 Nissan 240SX?
Find the lower radiator hose, which is under the top hose running from the left side of the radiator to the engine.
The loswer hose should run into an L shapped housing which is bolted onto the motor. Remove the 3 bolts attaching the housing to the motor, the thermostat should be right there. When replacing the housing besure to use a liquid gasket or else you'll have a leak.
If you look straight down on your engine it right below a little to your left of your cam gears, its that tube that sticks out and goes to the left and to down below into your radiator. The tube is connected to a metal thing, you have to take off the metal thing and the thermostat will be inside.
where the bottom hose of the raidator connects to the engine.
ok clear this up. At the lower hose is a sensor not the thermostat, the thermostat is located on the front of the block running vertical and just left of the water pump.
The thermostat is located under the alternator and is attached to the bottom radiator hose. There are four bolts holding the thermostat housing to the block and two bolts connecting the housing to the bottom radiator hose. Remove the housing. You will need to use liquid gasket maker as there are no longer gaskets for the thermostat.
Yes the ecu will work. First disconnect the battery and connect the new one then reconnect the batter. Start up the 240sx and it should work it not it needs to be diagnoste goggle 1990 240sx ECU CODES FOLLOW THE STEPS AND THAT SHOULD WORK I know cause I'm using a 1992 ECU FROM Nissan Stanza. I was told it's alittle advanced on the horse power side and idle moves quicker.
Where can you find an engine coolant overflow container that is not messed up for a 1991 Nissan 240SX?
You can't. I have seen probably 50+ of them, and every one is dry rotted on the front left. You will have to purchase an aftermarket overflow. Here are some links: http://www.horsepowerfreaks.com/performanceparts/Nissan/240SX/Cooling/Coolant_Overflow_Tanks http://www.prostreetonline.com/buy/weapon_r_coolant_overflow_tank/nissan/ Voodoo Street