How do you replace the thermostat located on a 1998 Honda Prelude?
Try looking at the lower radiator hose. It should end up somewhere on the block. In any normal car, that is where the thermostat housing is located. my guess is there are two bolts on either side of the T.H., and a red, blue, or black ring that runs along the base, which is a silicone gasket. remove the bolts and pry the housing from the block (be careful). the thermostat should be seated inside the housing. when you install it make sure its pointed in the right direction.
Put the gasket on your new thermostat, and set it in the cup the way the old one was in there. There's a pin on one side of the thermostat, and it should be at the top. Put the cup back in its mount, thread in the bolts and tighten them to 9 lb-ft, or 108 in-lb if you've got a 1/4" drive torque wrench.
Now remove the radiator cap and pour some coolant in there. Use either "all makes all models" coolant or Honda Genuine coolant--nothing else. When coolant comes out of the bleeder bolt, tighten it and replace the radiator cap.
1995 Honda Prelude thermostat replacement The thermostat is located on the left side rear of the engine at the end of the lower radiator hose. There are three bolts in a triangular bolt pattern fastening the thermostat housing cap to the housing body. The cap also has the coolant sensor in it. The orientation of the thermostat is critical. There are a pair of holes that locate the gasket pins in the main engine body…
do this only after you have not driven the car for 3-4 hours to let the coolant drain and cool..look for the upper radiator hose on the block. there will be a dome shaped object with 3 brackets that the hose runs into. u will need a 10mm to remove the two bolts across from each other. remove thermostat and replace with new one and gasket