Tip & How-To about 1992 Honda Prelude

How to Change Thermostat

You'll Need: NEW Thermostat and NEW Thermostat Gasket - Ratchet - 10mm Deep Well Socket (or) extension) - Phillips Screw Driver - Pliers - Empty Milk Jug

  1. DIAGNOSE: Do you have trouble getting your Prelude up to temperature in the winter with little to no heat yet it still runs perfect? Does it over heat in the summer? You most likely have a thermostat that is stuck open or stuck closed. The normal operating temperature of the 92-96 Honda Prelude is exactly at the halfway mark on the digital gauge on your dash. The thermostat is a spring mechanism activated by pressure and temperature built up in your cooling system. Coolant is traded back and forth between your engine and your radiator as needed with a properly functioning thermostat. Before beginning this repair, confirm that you don't have any major coolant leaks. Check your coolant level. It should be full even with a bad thermostat unless you had a major overheating incident. A large leak will result in similar behavior yet it could be something else like a radiator, head gasket or radiator hose.
  2. Step 2 PREPARE: Find a suitable place to work, it will reduce stress. Indoors in a garage with plenty of lighting is best. Cut the top off of an empty and clean 1 gallon milk container. Mostly just the top, make sure you still leave the handle. If it fits under the front of the car don't worry about using a jack. If you use a jack, follow all of the precautions listed with your jack and/or jack stands. Using gloves during this entire process will prevent you from chemicals, cuts and grime. You'll need to twist open the drain plug on the bottom center of your radiator. Do this only when the motor is NOT HOT. Once the gallon container is near full, you have drained enough from the system to prevent a mess when removing your old thermostat. Close the drain plug at this time.
  3. Step 3 DISMANTLE: Now remove the air intake tube by unsnapping it from the air box housing first. You'll need to back out the Phillips screw on the clamp that holds this tube to the throttle body. Then carefully disconnect any hoses attached to it as you wiggle it up and out of the way. Now you will see that the lower radiator hose actually snakes up into the thermostat housing. Collapse the clamp on this hose and slide the clamp back about 4 inches onto the hose. It will require a firm grip to twist the hose back and forth to free it up from the housing. Do this while pulling back on the hose to pop it off. When removed, try to prop the hose in an upright position to prevent gravity from drawing coolant through it. Now, remove the (2) 10mm bolts that hold the thermostat housing on. Wiggle it off and take note of which way the thermostat is facing. It is important that you install the new one facing the same way. It's a good time to CLEAN the parts that will be going back on and clean around the thermostat opening on your engine. Don't use anything that would scratch the aluminum, you're just trying to remove calcium and the oxidized roughness.
  4. INSTALL: Now place your NEW gasket on your NEW thermostat paying attention to necessary position of the gasket. Some people will use a sealant when reinstalling. If your surfaces are mostly clean, the rubber gasket will be just fine. Position the thermostat back onto the motor exactly as it was removed and DON'T FORGET TO PUT THE GROUND WIRE ON when you put the 10mm bolts back on. Don't over tighten or you'll snap one. Compare it to how tight it was when you removed it. Put everything back the way you removed it and pour the coolant back into the top of the radiator with a funnel.
Follow all safety precautions included with all of the equipment and tools you use. Avoid antifreeze spills. Keep plenty of towels available to clean up messes. Don't forget to wear gloves. Do this job with the engine COOL.

Posted by on

1992 Honda Prelude Logo

Related Topics:

Related Questions:

1 Answer

van is overheating


most likley you need to replace the thermostat. but check to make sure your fan is comming on to cool the motor down first check all fuses. under dash and under the hood.


  • 1

    Place a catch pan under the drain valve of your Venture radiator.

  • 2

    Open the radiator valve and drain at least 2 quarts of coolant. Then close the drain valve.

  • 3

    Remove the air cleaner and duct assembly from the top of the engine to gain access to thev thermostat housing. Use a screwdriver and a ratchet and socket if necessary.

  • 4

    Disconnect the crossover exhaust pipe using a ratchet, ratchet extension and socket.

  • 5

    Follow the upper radiator hose towards the engine to locate the thermostat housing.

  • 6

    Disconnect the upper radiator hose from the thermostat housing. Use a pair of rib joint pliers to loosen the clamp, and then slip it off the thermostat housing towards the radiator. Other Venture models may use a worm clamp type, which you can remove using a standard screwdriver or ratchet and socket.

  • 7

    Remove the upper radiator hose from the thermostat housing by carefully twisting and pulling the hose off the fitting.

  • 8

    Unscrew the two mounting bolts from the thermostat housing using a ratchet, ratchet extension and socket. Detach the thermostat housing from the engine.

  • 9

    Note the exact position of the thermostat so that you install the new one the same way. Then remove the thermostat and gasket.

  • Install the New Thermostat
  • 1

    Apply a light coat of room temperature vulcanizing (RTV) sealer to the threads of the thermostat housing bolts.

  • 2

    Set the new thermostat and new gasket in place.

  • 3

    Set the thermostat housing in place and start the two mounting bolts by hand. Then tighten the bolts using the ratchet, ratchet extension and socket.

  • 4

    Connect the upper radiator hose to the thermostat housing.

  • 5

    Tighten the upper radiator clamp over the thermostat housing using the rib joint pliers, standard screwdriver or ratchet and socket.

  • 6

    Connect the crossover exhaust pipe using the ratchet, ratchet extension and socket.

  • 7

    Install the air cleaner and duct assembly using the screwdriver or ratchet and socket.

  • 8

    Add coolant to the radiator using a 50/50 mixture of distilled water and anti-freeze.

  • 9

    Start the engine and check the upper radiator hose and thermostat housing for leaks

  • Dec 08, 2010 | 2000 Chevrolet Venture

    1 Answer

    Replacing a timing belt on a 1994 Ford Ranger


    Instructions Things You'll Need:
    • Drain pan
    • Ratchet
    • Ratchet extension
    • Socket set
    • Small standard screwdriver
    • Phillips screwdriver
    • Timing belt tensioner wrench No. T74P-6254-A
    • Large standard screwdriver
    • Torque wrench
    • Timing belt
    • Timing belt cover gasket
      Preparation
    1. Place a drain pan under the radiator and drain the coolant from the radiator.

    2. Squeeze the spring clamp holding the upper radiator hose to the radiator fitting with a pair of rib joint pliers and slide the clamp towards the engine.

    3. Twist and pull the upper radiator hose off the radiator.

    4. Remove the fan blade using a ratchet, ratchet extension and socket.

    5. Rotate the belt tensioner pulley using a breaker bar and remove the drive belt.

    6. Detach the water pump pulley using a ratchet, ratchet extension and socket.

    7. Pry off the access plug from the upper part of the timing belt cover using a small standard screwdriver.

    8. Set the transmission to Neutral and apply the Parking brakes.

    9. Rotate the crankshaft pulley with a ratchet, ratchet extension and socket to align the "O" mark on the crankshaft pulley and the "O" mark on the belt cover.

    10. Look through the cover access hole. If you see another timing mark on the camshaft sprocket aligned with the mark on the inner belt cover, cylinder number 1 is at Top Dead Center (TDC). If not, rotate the crankshaft one complete turn again and check for the alignment marks.

    11. Removing the Timing Belt
    12. Unscrew the four mounting bolts and the Phillips screw next to the access plug from the timing belt cover using a ratchet, ratchet extension and socket and Phillips screwdriver.

    13. Detach the crankshaft pulley using a ratchet, ratchet extension and socket and remove the belt guide (large washer) from behind the crankshaft pulley. You may need a pulley remover to take the crankshaft pulley off. If so, you can rent one from most auto parts stores.

    14. Loosen the adjusting bolt on the tensioner pulley assembly using a ratchet, ratchet extension and socket.

    15. Rotate the tension spring rollpin (this is the screw next to the adjuster bolt on the tensioner pulley assembly) away from the timing belt using timing belt tensioner wrench number T74P-6254-A. As you hold the timing belt loose, tighten the assembly adjuster bolt to lock the tensioner using the ratchet, ratchet extension and socket. Now remove the tensioner wrench.

    16. Remove the timing belt.

    17. Installing the New Timing Belt
    18. Install the new timing belt starting at the crankshaft sprocket. Route the belt in a counterclockwise direction over the auxiliary and camshaft sprockets. Properly engage the belt lugs on the sprockets' teeth and keep any slack on the belt to the right side, between the crankshaft and camshaft sprockets. Make sure not to rotate any of the sprockets as you install the timing belt.

    19. Loosen the adjuster bolt on the tensioner pulley assembly so the tensioner rolls against the belt. If necessary, push the tensioner pulley against the belt with a large standard screwdriver to remove any remaining slack on the belt.

    20. Make sure the transmission is in the Neutral position and the Parking brakes are engaged.

    21. Rotate the crankshaft two complete revolutions so that cylinder No.1 is back in TDC. This will help to tighten the timing belt on the sprockets.

    22. Tighten the adjuster bolt on the tensioner pulley assembly between 14- and 21-foot lbs. (19.0 to 29.0 Nm) using a torque wrench.

    23. Tighten the tension-spring bolt between 28- and 40-foot lbs. (38.0-54.0 Nm) using the torque wrench.

    24. Install the belt guide (large washer) and the crankshaft pulley. Tighten the pulley bolt with the ratchet, ratchet extension and socket.

    25. Install the timing belt cover with a new gasket using the ratchet, ratchet extension and socket and Phillips screwdriver.

    26. Reinstall the water pump pulley, drive belt, fan blade and upper radiator hose.

    27. Refill the cooling system with coolant.

    Oct 11, 2010 | Ford Ranger Cars & Trucks

    1 Answer

    where is thermostat


    Hi this is a big job and not the kind of job a novice can do below is the instructions on removing and refitting the thermostat

      Remove the Thermostat
    1. 1 Place a catch pan under the drain valve of your Venture radiator.
    2. 2 Open the radiator valve and drain at least 2 quarts of coolant. Then close the drain valve.
    3. 3 Remove the air cleaner and duct assembly from the top of the engine to gain access to the thermostat housing. Use a screwdriver and a ratchet and socket if necessary.
    4. 4 Disconnect the crossover exhaust pipe using a ratchet, ratchet extension and socket.
    5. 5 Follow the upper radiator hose towards the engine to locate the thermostat housing.
    6. 6 Disconnect the upper radiator hose from the thermostat housing. Use a pair of rib joint pliers to loosen the clamp, and then slip it off the thermostat housing towards the radiator. Other Venture models may use a worm clamp type, which you can remove using a standard screwdriver or ratchet and socket.
    7. 7 Remove the upper radiator hose from the thermostat housing by carefully twisting and pulling the hose off the fitting.
    8. 8 Unscrew the two mounting bolts from the thermostat housing using a ratchet, ratchet extension and socket. Detach the thermostat housing from the engine.
    9. 9 Note the exact position of the thermostat so that you install the new one the same way. Then remove the thermostat and gasket.
    10. Install the New Thermostat
    11. 1 Apply a light coat of room temperature vulcanizing (RTV) sealer to the threads of the thermostat housing bolts.
    12. 2 Set the new thermostat and new gasket in place.
    13. 3 Set the thermostat housing in place and start the two mounting bolts by hand. Then tighten the bolts using the ratchet, ratchet extension and socket.
    14. 4 Connect the upper radiator hose to the thermostat housing.
    15. 5 Tighten the upper radiator clamp over the thermostat housing using the rib joint pliers, standard screwdriver or ratchet and socket.
    16. 6 Connect the crossover exhaust pipe using the ratchet, ratchet extension and socket.
    17. 7 Install the air cleaner and duct assembly using the screwdriver or ratchet and socket.
    18. 8 Add coolant to the radiator using a 50/50 mixture of distilled water and anti-freeze.
    19. 9 Start the engine and check the upper radiator hose and thermostat housing for leaks.

    if your doing the job yourself then just take your time and remember where all the bolts you undo come from as putting them back in correct order can be a nightmare.

    plz rate this solution as unrated posts will be removed from the site, plus i have a whole page of unrated posts, thanks

    Aug 30, 2010 | 1999 Chevrolet Venture

    1 Answer

    WHAT'S NECESSARY TO REPLACE A THERMOSTAT ON 1997 PONTIAC BONNIVILLE?


    Good Evening. On your Bonneville you will need a 10mm socket (preferrably a deep socket), an extension, a swivel and a ratchet. In the area it is I have found it is easier with an extension. Firmly grasp the neck underneath your oil cap and turn it counterclockwise, and then remove the plastic decorative 3800 cover. Follow the upper radiator hose the one on your right standing in front of the car, once you reach the end where it attatches to the engine that is where your thermostat housing is. From there it is self explanatory, just be sure to always use a new gasket around your thermostat. Good luck and hope this helps.

    Aug 07, 2010 | Pontiac Bonneville Cars & Trucks

    1 Answer

    I need to know how to change the water pump on my 2000 Saturn SL I also need to know what tools it will require.


    Your gonna need these tools,
    deep 15mm socket
    3/8 extension
    3/8 ratchet
    1/4 ratchet
    pliers
    wd40 or something like it
    10mm socket, can be deep or shallow, doesnt matter,
    14mm wrenchm the longer the better
    floor jack
    1/2 long ratchet
    19mm socket
    1 inch 3/8 extension
    medium size flat head screw driver
    metal scraper
    jack stands,or something of the sort
    coolant drain,or a big container,to hold coolant,
    that should be it for tools,,,
    .... jack up the front passenger side and put a jack stand under the rocker area to hold car up,, remove the wheel with the 19mm socket and long 1/2 ratchet,break these nuts loose before you jack it up,,,,,,
    ...inside the right wheel well area to the right you will see a black splash shield,there is 1 push pin that holds this shield to the subframe,pop the center of the push pin up and out with the flat blade screw driver.and then pop the rest of the push pin out,,now at the top of the splash shield youll see a little tab pop that out with the flat blade screw driver,,,then at the right bottom there is a tab that sticks out the splash shield to the subfram just pop it out with the screw driver and now the shield should be off,now you can see the water pump to the top right of the opening,,,
    ...there are 3 10mm bolts that hold the water pump pulley onto the water pump,you need to loosen these first other wise your not gonna get them loose after the belts off,so loosen the 3 10mm bolts,,
    ,,,,under the front of the car you will see a black radiator splsh shield running the width of the car from left to right directly under the radiator,you need to remove it,there are 2 push pins on each side take them out and it will fall off,,,,,
    ,,,remove the coolant cap (providing you car is cold)let the car off for now,,,
    spray a little WD40 on the radiator petcock on the passenger front of the radiator at the bottom,you will see it,,,some of these have a flat tab on it and some use a 1/4 ratchet hole in them so if you got the hole do the 1/4 ratchet,if you got the tab use a pliers to loosen the petcock like 1/2 or so,do not remove the petcock,,if it seems hard to open just lube it some more and work it in and out til it loosens up,,,,,make sure you have the coolant drain under and ready to go.,,,so now drain the coolant,,sometimes after you turn the petcock nothing comes out even thou its open,if this happens just pull the petcock out with the pliers a little and it should be draining now,,,,,now take the jack and place it under the oil pan with the handle facing to the front of the car and jack it up til you have alittle tension on the oil pan,,,,now go under the hood and at the coolant resivor you will see a black engine mount right there its held on by 5 15mm nuts remove all these and take mount off,,,now jack up the jack till you see the engine stop going up,,,,,now you have room to remove the serp belt,,,,the tensioner is mid way down the engine and to the left under the power steering pump,,use the 14mm wrench and turn the tensioner till the belt is loose and then take the belt off,,,,,,now let the engine come down off the jack and go into the fender well and remove those 3 10mm water pump pulley bolts,then jack the engine back up and tilt the pulley til it comes out the top,,,,now remove as many of the water pump mounting bolts from the top as you can,,,,once youve done that,let the engine off the jack and go into the fender well and remove the remaining water pump mouting bolts, and then take the water pump out thru the wheel well area,,,use the metal scraper to make sure there is no gasket and or dirt on the engine block where the new pump will mount,,,it needs to be clean,,,,,,,once the gasket area of the engine black is clean,,,get the new pump and gasket and put it on the engine from the wheel well area,, i usually start the bottom 2 water pump blots by hand and then jack up the engine and go put the top bolts in front the top of the engine,,,once they are all started go and tighten them all,,good and snug,,,make sure the gasket is on there correctly,or it will leak,,,depending on where you got the pump from the gasket may or may not be attached to the pump firmly,if its not i dab some RTV sealer on it to keep it in place till i got the bolts tight,next put the pulley back on from the top just like you removed it,,,with the engine jacked up put the serp belt on,,,,,wrap the belt around the crank first then up around the tensioner then the power steering pump ,,then on the right side go around the water pump and A/C pulley and dip it under the idler pulley in the center of the engine,now pull the tensioner so you got slack and slip it onto thatlast idler pulley i just mentioned,,,let the jack half way down and install the top engine mount,,,close the petcock and put sheild back on,,,,,put wheel well shield back on,,and tires,wheel,,,let jack down off engine,,,let car off jack stand,,,fill with new coolant,water and let it run alittle with the coolant cap off to allow the air to come out,so keep checking it to see if the coolant went down and it will,,then once its not talking anymore coolant put the cap on and drive it,,,,,let car cool off and recheck level,,,that should be about it,,its a easy process like 1/2 with air tools,,,,good luck i hope this helped you

    Oct 28, 2009 | 2000 Saturn SL

    Not finding what you are looking for?

    2,418 people viewed this tip

    Ask a Question

    Usually answered in minutes!

    Top Honda Experts

    yadayada
    yadayada

    Level 3 Expert

    75077 Answers

    Colin Stickland
    Colin Stickland

    Level 3 Expert

    22095 Answers

    Jeff Turcotte
    Jeff Turcotte

    Level 3 Expert

    7768 Answers

    Are you a Honda Expert? Answer questions, earn points and help others

    Answer questions

    Loading...