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Leak fro thermostat housing - Cars & Trucks

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It may be you have a craked thermostat housing or a damage head check very carefully

Posted on Oct 22, 2013

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1 Answer

My engine is leaking coolant from behind the thermostat 3100 v6


Leaking gasket,try head gasket fix fro $30.00 will stop in 24 h.

Feb 04, 2013 | 1997 Chevrolet Monte Carlo

1 Answer

Car keeps overheating.


replace the thermostat housing and use hi temp gasket silicone.

Oct 09, 2012 | Hyundai Motor 1999 Elantra

1 Answer

Anti freeze leak I hear hissing sound under neath fuel injection system


could be leaking at the top radiator hose going to thermostat, that is a hard spot to see leak remove the air filter and air filter housing look below throttle body you see thermostat housing, check for leaks around thermostat housing gasket and check for leak at the top radiator hose going to radiator and thermostat.if all is good check all radiator hoses for leaks check small coolant lines going to throttle body for leaks and check make sure bleeder screw on thermostat housing not loose it will leak also check around radiator and water pump heater bypass metal lines for leaks.

Sep 10, 2012 | 1999 Chevrolet Lumina

1 Answer

Changed water pump,thermostat, top rad. hose. still leaking leaking antifreeze from what looks like below thermostat housing. have noticed super small hose from water pump to engine. looks hard to replace....


That is called the bypass hose. It could be leaking but I'd take a closer look at the thermostat housing. If you replaced only the thermostat and not the housing, the housing may be leaking. It's a common source of coolant leaks.

Apr 16, 2011 | 2000 Dodge Ram 1500 Truck

1 Answer

There is a leak at the water outlet housing wherethe overflow tubing connects to it. There is no gasket or o ring to solve this.. how do you fix it?


check the radiator hose going to thermostat housing.it could be leaking.if hose okay.thermostat seal more likely leaking, meaning you have to replace the thermostat with seal.if thermostat with new seal still leaking.thermostat housing has a small crack in it.need replacing.

Apr 12, 2011 | 1999 Oldsmobile Alero

1 Answer

I can't get the thermostat housing off the engine to replace the thermostat. i've removed the bolts, upper radiator clamp and hose from the elbow going to the housing and it is loose, but it wo'n tcome off...


The thermostat is not under the upper housing. The thermostat is behind the lower housing that the lower hose is connected to.

If you are changing the upper housing known as the water outlet housing because it is leaking you are on the right track. You will need to remove the intake plenum on top of the engine and the upper radiator support. You will then be able to access the bolt on the backside of the engine that bolts the pipe retainer in place and disconnect the hose from the pip. The upper radiator support needs to be removed in order fro there to be enough clearance to pull the whole assembly out.

Jan 26, 2011 | 2003 Dodge Intrepid

1 Answer

Where is the thermostat located on a 1998 cavalier 2.4?


Things You'll Need:
  • Wrenches and sockets
  • Torque wrench
  • Thermostat and gasket
  • Gasket scrapper
  • Antifreeze
  • Screwdriver
  1. 1

    Follow the lower radiator hose to where it meets the thermostat housing. The thermostat housing is where the opposite end of the lower radiator hose mounts to the engine.

  2. 2

    Drain enough coolant from radiator until it is below the thermostat. Failure to do this will result in your antifreeze leaking out onto the ground.

  3. 3

    Loosen clamp and remove radiator hose from thermostat housing. Some antifreeze will leak out, so have some rags available.

  4. 4

    Remove the bolts holding the thermostat housing on and pull the housing from the engine. The gasket might make it a little difficult, so do not be afraid to pull hard. Do not strike it with any tools as you can crack it.

  5. 5

    Remove the old thermostat and note its alignment.

  6. 6

    Place a rag in the thermostat's mounting hole so no gasket material can enter the engine and then scrape the gasket from the housing and the engine.

  7. 7

    Install the new thermostat in same position as old one.

  8. 8

    Reinstall the housing and tighten down bolts snugly. Torque them with your torque wrench to 10 ft.-lbs. Make sure you do not over-tighten them.

  9. 9

    Reinstall the radiator hose to thermostat housing and tighten the clamp.

  10. 10

    Refill the radiator with coolant and start the engine, allowing it to reach normal operating temperature.

  11. 11

    Check for any leaks at hose connection and thermostat housing. You can tighten them as necessary to stop any leaks.

  12. 12

    Stop the engine and allow it to cool down completely then check the coolant level. Add coolant as required.

Dec 08, 2010 | 1998 Chevrolet Cavalier

2 Answers

Replaced the water pump on our '97 Buick Century because we thought that is where the leak was originating. Replaced the hose from the radiator to the water pump as well. It is still leaking with fluid...


YEP YOU HAVE LEAK AT THERMOSTAT HOUSING.YOU NEED REMOVE THERMOSTAT HOUSING OUTLET AND CLEAN THE MATING SURFACE THOROUGHLYTHEN APPLY RTV SEALANT IN THE GROOVE OF THE WATER OUT LET HOUSING.INSTALL THERMOSTAT WITH SPRING TOWARD THE ENGINE TORQUE THERMOSTAT OUTLET HOUSING BOLTS 89 INCH LBS.IF STILL LEAKS OUTLET HOUSING COULD HAVE CRACK IN IT CAUSING LEAKING.

Sep 08, 2010 | Buick Century Cars & Trucks

2 Answers

Where is the thermostat


Please choose the correct steps for the size of engine that you have:

4.5L & 4.9L Engines
  1. Drain the coolant to a level below the thermostat housing.
  2. It may be necessary to remove the upper air filter assembly on some models.
  3. Remove the 2 bolts securing the upper thermostat housing to the lower housing.
  4. Remove the upper thermostat housing.
  5. Remove the thermostat and O-ring from the lower housing.

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Thermostat installation—4.5L and 4.9L engines

To install:
  1. Install the thermostat and a new O-ring to the lower housing.
  2. Install the upper thermostat housing to the lower housing. Tighten the thermostat housing bolts to 20 ft. lbs. (27 Nm).
  3. Refill the cooling system using a 50/50 mixture of water and ethylene glycol antifreeze.
  4. Start the engine and check for coolant leaks. Allow the engine to come to normal operating temperature. Recheck for coolant leaks.

4.6L Engines
  1. Drain the coolant to a level below the thermostat housing.
  2. On some vehicles, access is easier if the front-end beauty panel and the air cleaner are removed.
  3. Remove the 2 bolts securing the thermostat housing to the intake manifold.
  4. Remove the thermostat housing.
  5. Remove the thermostat and O-ring from the housing.

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Thermostat installation—4.6L Engine


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Loosen the upper radiator hose clamp at the thermostat housing


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Remove the upper radiator hose clamp from the thermostat housing


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Remove the thermostat housing retaining bolts and . . .





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. . . remove the thermostat housing from the engine


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Separate the thermostat from the housing

To install:
  1. Install the thermostat and new O-ring to the housing.
  2. Install the thermostat housing to the intake manifold. Tighten the thermostat housing bolts to 18 ft. lbs. (25 Nm).
  3. Refill the cooling system using a 50/50 mixture of water and ethylene glycol antifreeze.
  4. Install the air cleaner and beauty panel, if removed.
  5. Start the engine and check for coolant leaks. Allow the engine to come to normal operating temperature. Recheck for coolant leaks.

May 23, 2010 | 1996 Cadillac DeVille

1 Answer

NEED LOCATION OF THERMOSTAT IN 1991 CADILLAC SEVILLE


  1. Drain the coolant to a level below the thermostat housing.
  2. On some vehicles, access is easier if the front-end beauty panel and the air cleaner are removed.
  3. Remove the 2 bolts securing the thermostat housing to the intake manifold.
  4. Remove the thermostat housing.
  5. Remove the thermostat and O-ring from the housing.
0900c15280090476.jpgThermostat installation—4.6L Engine 0900c15280090477.jpgLoosen the upper radiator hose clamp at the thermostat housing 0900c15280090478.jpgRemove the upper radiator hose clamp from the thermostat housing 0900c15280090479.jpgRemove the thermostat housing retaining bolts and . . . 0900c1528009047a.jpg. . . remove the thermostat housing from the engine 0900c1528009047b.jpgSeparate the thermostat from the housing To install:
  1. Install the thermostat and new O-ring to the housing.
  2. Install the thermostat housing to the intake manifold. Tighten the thermostat housing bolts to 18 ft. lbs. (25 Nm).
  3. Refill the cooling system using a 50/50 mixture of water and ethylene glycol antifreeze.
  4. Install the air cleaner and beauty panel, if removed.
  5. Start the engine and check for coolant leaks. Allow the engine to come to normal operating temperature. Recheck for coolant leaks.

Nov 27, 2008 | 1992 Cadillac DeVille

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