You have a 86 Honda Prelude 20 Si and the fan continues to run after the car has been shut off for several hours unless you remove the relay and shut it off Is there a thermostat or timer and where?
I had this problem for a while. I believe I replaced a relay or fuse to solve it. I know the solution wasn't expensive.
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
Follow the lower radiator hose to it's end near the engine. Remove hose at this end and stick finger into thermostat housing. That thingy that you feel? Yeah, that's the thermostat. Note that if replacing the thermostat, use only a stat that has the exact same dingleberry as the original stat and position it in the exact same clock position to prevent air bleed problems. Note that inexact replacement thermostat seals may make this difficult.
Follow the upper radiator hose from the radiator to the engine. The thermostat will be located behind the thermostat housing at engine end of upper radiator hose. Drain some coolant into a clean container. Remove upper radiator hose from thermostat housing. Remove the 3 bolts that hold the thermostat housing to engine. Remove thermostat housing. Remove thermostat. Be sure to install the new thermostat facing in the same direction as the old one was.
RAISE THE HOOD AND FIND THE TOP RADIATOR HOSE. FOLLOW IT TO THE BOTTOM. THERE YOU WILL FIND THE THERMOSTAT HOUSING. DRAIN ABOUT THREE QUARTS OF COOLANT FROM THE RADIATOR, AND REMOVE THE HOSE AT THE THERMOSTAT HOUSING AND REMOVE THE TWO BOLTS SECURING IT, AND REMOVE THE HOUSING. REMOVE THE THERMOSTAT FROM THE BLOCK. CLEAN THE THE OLD GASKET AND INSTALL THE THERMOSTAT IN THE REVERSE ORDER. BE SURE TO ADD THE COOLANT AGAIN…
Follow the upper radiator hose from the radiator towards the engine. The upper radiator hose is connected to the thermostat housing on the engine side. The thermostat is under/inside the thermostat housing. Remove the upper radiator hose from the housing then remove the two bolts holding down the thermostat housing then remove the thermostat housing to expose the thermostat.
The thermostat is on the top-right of the engine toward the front. The upper raditor hose connects to it. MAKE SURE the engine is cold before attempting to remove the thermostat. There are 2 bolts which secure the thermostat housing. Remove the bolts, remove the thermostat housing and the thermostat sits right underneath. Reach in and remove it. There some good pictures at this link to help locate the thermostat housing..http://www.autoclinix.com/Manifold2.htm
Drain the radiator into a suitable container. Remove the top radiator hose at the engine. That is the thermostat housing. Remove the 2 bolts and remove the thermostat. Clean the thermostat housing and the intake manifold and install the thermostat. It is not necessary to use silicone sealer but if you feel you must then use sparingly.