Question about 1991 Toyota Camry

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Retail thermostats did not open. Old original put back and works.

Retail thermostats did not open. I put back what was in the housing and now it doesnt overheat. It looks to be original. Old but works. why?

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Toyota normally have 'failsafe' thermostats wich will fail in the open position, this can work ok but you will find that your engine will not reach optimum temperature an therefore not give you a good mpg and your heater will not get up to temp also.

Buy genuine Toyota thermostat for this and you will not regret it,

Posted on Aug 05, 2009

  • David Parker
    David Parker Aug 11, 2009

    Hope I have resolved you question, but please leave positive feedback if so , as it still takes time to answer questions and it would just be nice to know if I have helped.


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Step by step replacing the thermostat

Break free 2 bolts on thermostat housing, loosen hose going into housing and clamp, it will leak some antifreeze. Once the housing is taken off block clean off old gasket material from both surfaces. The block and housing, be careful not to scratch the surfaces. No sharp pointy objects, aluminum is soft. Then take the old thermostat out and put in the new one. Put gasket in place ,align housing and put , bolts in by hand first, so it doesn't cross thread. Just snug bolts and top off system with antifreeze . Start engine ,put on heat and run until thermostat opens. Check for leaks, tighten bolts 1/4 turn should be fine. Add antifreeze in overflow bottle if needed.

Dec 05, 2014 | 2001 Chrysler Voyager

1 Answer

Thermostat replacement

take the 2 bolts on the thermostat housing out, pull up on the housing, antifreeze will go everywhere, pull the thermostat out, put the new one in, in the same position you pulled the old one out. replace gasket, put the housing back on, put bolts in, fill radiator, start the car warm it up looking for leaks and monitoring coolant level until car is up to temp. you will be able to see current in the coolant with the radiator cap off when the thermostat opens. A couple things to keep in mind. 1 coolant will expand and slowly rise out of the filler neck between open cycles of the thermostat, 2. VERY important keep the cap off the radiator while warming up the car and monitoring coolant levels.

Feb 16, 2012 | 2001 Pontiac Grand Am SE

1 Answer

Is not heating

  • Raise and fully support the hood on the ford Remove the radiator cap and place a coolant drain pan underneath the radiator.
  • Open the drain-**** on the radiator and completely drain all of the coolant from it. It should take 10 minutes to fully drain. After this time close the drain-**** securely.
  • Locate the thermostat housing on the side of the engine below the alternator. It's not necessary to remove the hose from the thermostat housing. You can access the thermostat easily once the housing unbolted.
  • Slide your coolant drain pan directly beneath the thermostat housing. This way any coolant that comes out of the housing will go into the drain pan and not on the ground.
  • Remove the two bolts holding the heater core housing to the engine with a socket wrench. Pull the housing away from the engine and take out the thermostat.

  • Install the new thermostat just as you removed the old thermostat. Your new thermostat should have a rubber seal already installed on it, if not you have the wrong replacement part.
  • Position the thermostat housing back into its original location and then return both of its bolts by hand to insure they thread correctly. Set your 1/4-inch drive torque wrench to 89 inch-lbs. and completely secure both bolts in place.
  • Refill the radiator with fresh coolant or with the coolant from the drain pan if it's less than three years old. Return the radiator cap and then start the engine on the Bravada. Check for leaks every five minutes until the engine reaches normal operating condition. Take the truck for a test drive once you've determined there aren't any leaks present.

  • Dec 04, 2010 | 2002 Ford Taurus

    1 Answer

    Lots of air no heat. Coolant was lower have added that. still no heat. any ideas on how to repair... is this expensive. 2006 Honda CRV I have less than 25000 miles on it.

    Have you checked the thermostat? If the thermostat has gone bad you may get one of two possible extremes. If it is stuck in the closed position, your vehicle will overheat. If it is stuck open, you will have no heat. SAFETY: DO NOT DO ANY OF THIS WHILE THE ENGINE IS HOT!

    Fortunately, this is an easy and relatively inexpensive fix if you do it yourself.

    To find the thermostat housing, follow the radiator hoses back to where they enter the engine block. You should see a hemispherical housing held on with two bolts. That is the thermostat housing. On your CR-V, it should be on the downward pointing hose. When you remove the housing, you will lose coolant, so position a catch basin to receive the coolant that comes out. Remove the bolts, lift the housing (you may need to pry it with a screwdriver). Remove the thermostat, being careful to note how everything was positioned. Inspect the thermostat; If the circular piece at the center attached to the spring is open (ie pulled away from the center) on a cold engine, the thermostat is bad and is stuck in the open opsition. To install a new thermostat, clean off all the old gasket and install the new one that comes with a new thermostat (if you do not clean off all the old gasket before installing the new one it will probably leak). Put the new thermostat in place in the same position as the old one, replace the housing and refill any lost coolant. God bless and good luck

    Oct 26, 2010 | 2006 Honda CR-V

    1 Answer

    My truck keep running hot what's wrong?

    Have you checked the thermostat and/or the coolant level? SAFETY: DO NOT DO ANY OF THIS WHILE THE ENGINE IS HOT!

    To check the coolant level, open the hood and look for a plastic cap with the thermometer symbol on it. (Do not confuse this with the windshield washer reservior, which has a windshield symbol on it). With the engine cold, look through the translucent plastic and compare the coolant level to the raised markings on the reservior. Fill as needed with a 50/50 mixture of coolant and distilled water.

    To find the thermostat housing, follow the radiator hoses back to where they enter the engine block. You should see a hemispherical housing held on with two bolts. That is the thermostat housing. Remove the bolts and the thermostat, being careful to note how everything was positioned. Replace the housing and refill any lost coolant. Realize that we are still in the diagnostic phase. Run the engine until you are satisfied that it is not over-heating. It will not hurt the engine to run without a thermostat, but your heater will not work. To install a new thermostat, remove the housing and clean off all the old gasket and install the new one that comes with a new thermostat (if you do not clean off all the old gasket before installing the new one it will probably leak). Put the new thermostat in place in the same position as the old one, replace the housing and refill any lost coolant.

    Aug 04, 2010 | 1998 Ford Explorer

    2 Answers

    How to install a thermastate

    Not “thermastate,” “thermostat.”

    Put a bucket under it, and open the radiator drain valve.
    Find the upper radiator hose.
    Follow it to the engine
    That which it is pushed onto is the thermostat housing.
    Unclamp the upper radiator hose at the engine.
    Pull it off of the thermostat housing
    Remove the bolts holding the thermostat housing to the engine, & remove it
    Clean the gasket surface on the engine, and on the thermostat housing
    place the new thermostat in position. If the thermostat is vertical, I put a liece of dental floss or sewing thread through it, thered them out the radiator hose hole, and hold both ends to keep it in position. The copper button goes on the engine side, leaving those supporting arms to wrap the thread through.
    With the thermostat in position, and the gasket in position, replace and tighten the bolts to attach the thermostat housing to the engine.
    Remove the thread if you had to use some.
    Push the radiator hose onto the thermostat housing.
    Tighten the hose clamp
    Refill wit coolant. If the coolant in the bucket is clean, use that. If not, refill with fresh coolant, using the proper mix of water and antifreeze. (Yes, you need anti-freeze in the summer. It raises the boiling point, reducing the risk of a boilover.)

    Jun 29, 2010 | 1988 Chevrolet Silverado 2500

    1 Answer

    I am looking for a manual or how to guide for replacing the thermostat on a 2004 Ford Explorer Sport Trac.

    remove radiator house from thermostat housing inlet... then remove two bolts that hold the housing on... remove thermostat from housing... replace thermostat with new one... make sure housing does not have any of the old gasket left on it, then replace gasket... ensure you use high temprature rtv.... then put the bolts back in and then put the hose back on... hope this helps

    Mar 30, 2010 | 2004 Ford Explorer Sport Trac

    1 Answer

    Thermostat is overheating

    This is one of the easiest things you will ever fix on your own car. Buy the new thermostat, and make sure you find out if ou need a O ring or a gasket. If it has a gasket you need to buy some blue sylicone also. Once you have all the parts then locate the termostat, special note make sure you notice how it went in. Remove it, after removeing the housing unit that its held inl. Sometimes they have to be screwed out of its housing. Once out and remembering how it looked inside the housing unit then put the new one back the same way. Now if its a O ring then put the new O ring in place of the old one. If its a gasket CLEAN the old one completely off then put your blue sylicone on both sides of the gasket, one side at a time not at the same time. then put the housing unit back together and tighten it back up.

    You have just successfully changed your thermostat.


    May 03, 2009 | 1998 Isuzu Rodeo

    1 Answer


    Are you putting the thermostat in correctly? It it will not work backwards.

    And to confirm that there isn't a different problem, take the thermostat out all together and see if it overheats.

    Engine not fully warming up is not usually caused by the thermostat. Stats usually fail closed, not open.

    You will want to check the water temperature sending unit or gauge after verify the water temperature with an external calibrated thermometer. You can attach and insulate the external thermometer to the housing where thermostat is located.

    Reply back what you figure out. I will be happy to help you further.

    Feb 03, 2009 | 1997 BMW 328

    1 Answer

    2005 Dodge stratus 4 cylinder

    It could be your thermostat, and the best place to start.
    Other possibilties are that the heater core is plugged / blocked. or your heater controls are not working properly.

    To change the thermostat, first, get the new replacement parts from your local parts store, drain some of your engine coolant, remove the thermostat (follow the top radiator hose to where it connects to the engine), remove that housing, and the thermostat is there. Clean off the old sealer on the housing, install then new thermostat, put the proper sealer down, then the gasket, then some additional sealer (use it sparingly, just enough to form a seal) put the housing back on, do not over tighten (they are usually small bolts, and will break off if over tightened) Add coolant to the motor (don't reuse the original stuff) run the motor and watch for leaks. Wait for it to come up to tempature and check operation, add more coolant is necessary. Dospose of the old coolant in the proper way.
    Once that is all complete, then see what it does for heat.
    If it still doesn't heat the car like it is supposed to, you can start trouble shooting the next possible causes.

    Oct 28, 2008 | 2002 Dodge Stratus

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