Question about 2000 Honda Prelude

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I need to replace my thermostat in my 2000 Honda Prelude but i don't know where it is?Which hose is it connected to, the top of the radiator or the bottom?

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The upper radator hose goes to the termastat follow that hose and it will bring you to the tstat

Posted on Nov 13, 2009

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Try looking at the lower radiator hose. It should end up somewhere on the block. In any normal car, that is where thethermostat 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). thethermostat should be seated inside the housing. when you install it make sure its pointed in the right direction.

Slightly more precise answer....


The thermostat housing is on top of the engine at the transmission end. The thing you're looking for is silver and has one radiator hose, two sensors and a bolt with a hole in the middle of it (the bleeder bolt) sticking out of it. The left end of this assembly is held in with two bolts, like the first responder said. Use a 12mm wrench to loosen the bleeder bolt, then use a 10mm socket to remove the two retaining bolts. Pull the assembly (we'll call it a cup) away and you'll find thethermostat in the piece that's in your hand. Look at how the thermostat's sitting in the cup, then remove it.


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 HondaGenuine coolant--nothing else. When coolant comes out of the bleeder bolt, tighten it and replace the radiator cap.

Posted on Nov 13, 2009

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Posted on Nov 13, 2009

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Hi, are you sure u need a new thermostat? Running in the mid temp range is ok. If u think u need to change it, here's the info. I believe your Prelude uses a 195 degree thermostat, but go to a good parts store and give them the year make, and model and ask them what thermo. u need. Also get a gasket. The thermostat is located at the end of the radiator hose (the top hose). Disconnect the house at the 'housing' and remove the housing (2 bolts), the thermostat is now exposed. Pop it out (u might need to persuade it w/ a screwdriver (gently pry it out) and remove the gasket, clean gasket surface. Install gasket and thermostat, being careful that they stay in position when u bolt the housing back in place. Re-attach radiator hose, top off coolant, (50/50 Mix), and last, there is a bleeder valve which I believe is on the housing that u loosen after starting the car, when air stops coming out, tighten and u r good to go. Do u have any idea when the coolant was last changed? U might want to consider it if it's been a long time, or u r not sure. Let me know how u make out, or if u have any questions. Good luck! countrycurt0

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