Hello everyone I have a 1995 LS400 and this car doesn't stop overheating. Yesterday I replaced all the coolant sesnors, radiator, and thermostat. I put all new hoses and the switch that goes to the bottom of the radiator. The starter was recently changed not that long ago so I was wondering is there a coolant hose under the manifold that probably got pinched and isn't letting it flow? Thermostat hose does not get hot and doesn't feel like it opens. Clutch fan works but the electric one in the front doesn't kick on when it heats up. Please help.

 

overheating usually is caused by improper bleeding (air bubbles in the system).
search on how to do it right, and it takes longer than you think (20-30mins of holding the revs to keep the water moving to extract the air).

the t-stat should open eventually, and run the heater at full blast.
hopefully you installed the t-stat correctly - jiggle pin at the highest point, 12 o'clock.

 

Yeah it's at the highest point the oil is not creamy and Im pretty sure I bleed it right haha

 

Did you make sure you used the right mixture? If you have more water than coolant, that will cause it to overheat as well.

More than likely, you may need to re-bleed the system.

 

I'd never recommend using straight water in the cooling system but it will not "cause" a healthy engine to overheat. Distilled water actually has excellent heat transfer properties but its boiling point (100C = 212 F) can make it less efficient if it begins to boil. Bubbles carry less heat away than a steady flow of fluid. Straight ethelyne glycol boils around 197 C = 387 F. Coolant also has anti-corrosive properties added that water obviously cannot provide. In a pinch, if you have no choice, water will do an adequate job of cooling an otherwise healthy engine. Just don't leave it in long term...

The proper mix of coolant (aka antifreeze) with water is most important in the winter months to prevent the mixture from freezing.