Question about 2002 Mercury Mountaineer

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On the '02 Mountaineer, 4.0L 6 cyl, does the o-ring gasket go into the thermostat housing before or after the thermostat? Instructions I've found are vague and I cannot find a diagram of the housing anywhere.

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The O-ring gets placed on top of the thermostat. Ford uses a two-piece hard plastic housing (non metal) and if you insert the O-ring before the thermostat then it will leak. That leak might cause some to over-tighten the bolts holding the housing together and leading to cracking of the housing. (The upper housing costs about $45 and lower about $65.) There is no gasket between the two housings.The thermostat is designed to allow the O-ring to fit snugly.

Changing the thermostat on this engine is very easy. It's only necessary to drain a small amount of coolant from the engine to start the repair.

Posted on Jun 04, 2009

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Where is the thermostat and how to i change it on 02 Hyundai xg350L?Was told to jack car up&change from under? PLEASE help with step by step instructions if possible. Have 1 O ring gasket.do I need 2?


Follow the lower radiator hose to the fitting on back center of engine... The hose from upper radiator to housing on top of the cross over is not the one you are looking for.

Jun 24, 2016 | 2002 Hyundai XG350

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Replace thermostat '02 ford escape 3.0l


1. Drain the engine cooling system.
2. Remove the air cleaner intake pipe.
3. Release the clamp and disconnect the upper radiator hose from the thermostat housing.
4. Remove the bolts and the thermostat housing.

o To install, tighten to 10 Nm (89 inch lbs.) .

5. Remove the thermostat and the O-ring seal.

o Discard the O-ring seal.

6. To install, reverse the removal procedure.

o Install a new O-ring seal and lubricate it with clean coolant

7. Fill and bleed the cooling system.
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Feb 26, 2015 | 2002 Ford Escape

2 Answers

My son replaced the thermostat and thermostat housing on his 2002 ford taurus. It is leaking from the bottom of the housing. What would cause this?


COULD HAVE DAMAGED RUBBER O RING TIGHTEN TOO TIGHT OR REUSED THE OLD ORING WILL CAUSE LEAKING.IF YOUR THERMOSTAT HAS PAPER GASKET INSTEAD O RING. YOU NEED TO PUT SEALANT ON BOTH SIDES OF THE GASKET.THAT WILL KEEP IT FROM LEAKING.IF YOUR VECHICLE HAD A RUBBER O RING AROUND THERMOSTAT REPLACE WITH NEW O RING DONT PUT PAPER GASKET IF YOU HAVE THE O RING SEAL.THE O RING DOES THE SEALING NO NEED PAPER GASKET.

Jan 13, 2011 | 2002 Ford Taurus

1 Answer

How to change the thermostat


This is for the 2.7L:

2.7L Engine
  1. Disconnect negative cable.

    CAUTION

    Do not remove pressure cap with the system hot and under pressure because serious burns from coolant can occur.

  2. Drain cooling system.
  3. Remove radiator lower hose from thermostat housing.
  4. Remove nuts from heater tube flange studs.
  5. Loosen starter bolt at heater tube bracket.
  6. Pull heater tube out of thermostat housing and position out of the way.
  7. Remove bolt and two studs.
  8. Remove thermostat housing, O-ring and thermostat.
  9. Remove thermostat housing bolts.

To install:

  1. Clean gasket sealing surfaces.

    NOTE

    Install thermostat with the bleed valve located at the 12 o'clock position, between tabs on seal.

  2. Install thermostat and seal into thermostat housing .
  3. If removed, install two studs.
  4. Install thermostat, thermostat housing and O-ring and bolt. Tighten attaching bolts to 105 inch lbs.(12 Nm).
  5. Lubricate new heater return tube O-ring with coolant.
  6. Position heater return tube flange over two studs. Install nuts.
  7. Tighten retaining nuts to 53 inch lbs.(6 Nm).
  8. Tighten starter bolt to 40 ft. lbs. (54.3 Nm).
  9. Connect the lower radiator hose to the thermostat housing. Install hose clamps.
  10. Refill cooling system.
  11. Inspect for leaks.
  12. Connect negative cable.
This is for the 3.2L and the 3.5L:

3.2L & 3.5L Engines
  1. Disconnect negative cable.

    CAUTION

    Do not remove pressure cap with the system hot and under pressure because serious burns from coolant can occur.

  2. Drain cooling system.
  3. Raise vehicle on hoist.
  4. Disconnect electrical connectors from engine oil and power steering pressure switches.
  5. Disconnect radiator and heater hoses from thermostat housing.
  6. Remove thermostat housing bolts.
  7. Remove housing, thermostat, and gasket.

    NOTE

    The OEM thermostat is staked in place at the factory. To ensure proper seating of replacement thermostat, carefully remove the bulged metal from the thermostat housing using a suitable hand held grinder. It is not necessary to restake the replacement thermostat into the thermostat housing.

To install:

  1. Position gasket on thermostat and housing.
  2. Install thermostat housing, gasket and mounting bolts onto block. Tighten attaching bolts to 105 inch lbs. (12 Nm).
  3. Install radiator hose.
  4. Install bypass hose.
  5. Connect electrical connectors from engine oil and power steering pressure switches.
  6. Connect negative cable.
  7. Fill cooling system.
  8. Inspect for leaks.
  9. Lower vehicle on hoist.

Nov 01, 2010 | 2002 Dodge Intrepid

1 Answer

I need to change my thermastat but can not locate it


REMOVAL & INSTALLATION (4 Cyl. eng.) CAUTION
Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also, when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.
  1. Position a suitable drain pan under the radiator drain **** and drain the cooling system.
  2. On the 1MZ-FE engine, remove the air cleaner cap assembly. Be sure to label all wiring disconnected.
  3. Disconnect the water temperature switch harness from the water inlet housing (except 5S-FE engines).
  4. Remove the oil filter on 5S-FE engines. On the 1MZ-FE engines, remove the heater hose covering the housing.
  5. Loosen the hose clamp and disconnect the lower radiator hose from the water inlet housing.
  6. Remove the two nuts from the water inlet housing and remove the housing from the water pump studs.
  7. Remove the thermostat and rubber O-ring gasket from the water inlet housing. To install:
  8. Make sure all the gasket surfaces are clean. Clean the inside of the inlet housing and the radiator hose connection with a rag.
  9. Install the new rubber O-ring gasket onto the thermostat. On 2SE and 3S-FE engines, align the jiggle valve of the thermostat with the protrusion on the water inlet housing. On 5S-FE engines, align the jiggle valve with the upper side of the stud bolt. On 2VZ-FE and 3VZ-FE engines, align the jiggle valve with the stud bolt. Insert the thermostat into the housing. Fig. 1: Remove the thermostat housing from the engine with the coolant temperature sensor - 1MZ-FE engine 89553p18.jpg
    Fig. 2: Removing the thermostat from the engine - 1MZ-FE engine 89553p19.jpg
    Fig. 3: Always discard the old O-ring from the thermostat, if reusing the old component 89553p20.jpg
    Fig. 4: Always replace the thermostat with the correct temperature specifications 89553p21.jpg
    Fig. 5: Line-up the jiggle valve with the protrusion on the housing - 5S-FE engine 89553g10.gif

  10. Position the water inlet housing with the thermostat over the studs on the water pump and install the two nuts. Tighten the two nuts to 78 inch lbs. (9 Nm) on 4 cyl. engines, 2VZ-FE and 3VZ-FE; 14 ft. lbs. (20 Nm) and 69 inch lbs. (8 Nm) on 1MZ-FE engines. Fig. 6: Thermostat installation - 2VZ-FE and 3VZ-FE engines 89553g11.gif
    NOTE: Don't forget to install a new O-ring onto the water inlet pipe. Apply soapy water to the O-ring prior to installation.
  11. Connect the lower radiator hose to the inlet housing and install the hose clamp. On the 3VZ-FE, tighten the bolt holding the water inlet hose to the alternator belt adjusting bar to 14 ft. lbs. (20 Nm). On the 1MZ-FE engine, tighten the bolt retaining the water inlet pipe to the cylinder head to 14 ft. lbs. (20 Nm).
  12. Attach the water temperature switch connector.
  13. On the 1MZ-FE engines, install the heater hose removed.
  14. Install the oil filter and check the oil level if removed. Install the air cleaner cap assembly on the 1MZ-FE engines.
  15. Fill the cooling system with a good brand of ethylene glycol based coolant.
  16. Start the engine and inspect for leaks.
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Oct 08, 2010 | 1990 Toyota Camry

1 Answer

Leaking water hose on top of the water pump


If you are referring to the thermostat by-pass riser pipe that runs from the pump housing around cyl 4,5, and 6 and to the throttle assembly then on to the heater core on the 3.4L V6, I have found there is a small rubber o-ring that is on the part of the pipe that is recessed in the pump housing. You will have to get this part from GM; in my city it runs about $9.60.

Mar 02, 2010 | 2004 Chevrolet Impala

1 Answer

Replace thermostat on 95 chevy silverado 6 cyl.


Drain coolant first,remove the thermostat housing bolts,clean gasket surfaces,install the new thermostat and gasket.Tighten the thermostat housing boltsto 21 ft.lbs.(28Nm).Refill with coolant start the engine and check for leaks.

Jan 10, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

Are there any online instructions for replacing the thermostat on the 2006 ford fusion 4 cyl. thank you much!


2.3L Engine
  1. Raise and safely support the vehicle.
  2. Drain the cooling system.
  3. Remove the 3 bolts and reposition the thermostat housing to gain access to the hose clamps.
  4. Remove and discard the gasket.
    • To install, tighten the bolts to 10 Nm (89 lb-in).
  5. Disconnect the heater hose from the thermostat housing.
  6. Disconnect the lower radiator hose from the thermostat housing and remove the thermostat housing.

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Thermostat housing and related components—2.3L engine

To install:
  1. To install, reverse the removal procedure.
  2. Install a new thermostat housing gasket.
  3. Fill and bleed the cooling system

Dec 07, 2009 | 2006 Ford Fusion

2 Answers

How do you change the thermostat on a 99 mercury mountaineer?


The thermostat is beneath the inlet housing from the top radiator hose. You are better off working on a cold engine and adding a little antifreeze when you finish to replace what you will lose when you remove the parts.

There should be 2 bolts holding down the fixture and there will be a round "O" ring type gasket sealing the fixture. Observe the direction of the thermostat so that you replace it right side up instead of backwards which is possible in some cars. Then replace the gasket and lightly bolt the housing down evenly. It is a soft metal and brute force will bend or break parts. Start your car and check the water level after you have turned on the heater and the car is hot. Add antifreeze to the overflow tank.

Myself, I take a half gallon bottle of hot soapy water and wash the engine area off to get rid of the antifreeze smell and it makes it easier to detect a leak if you have one.

Oct 27, 2009 | 2000 Mercury Mountaineer

1 Answer

I need to know where the location of the thermostat is on a 1999 chrysler 300m so i can replace


The 2.7L engine lower radiator hose, connects to the thermostat housing.

To Remove:
1.Disconnect the Negative battery cable.
(Engine COLD!)
  1. Drain cooling system.
  2. Remove radiator lower hose from thermostat housing.
  3. Remove nuts from heater tube flange studs.
  4. Loosen starter bolt at heater tube bracket.
  5. Pull heater tube out of thermostat housing and position out of the way.
  6. Remove bolt and two studs.
  7. Remove thermostat housing, O-ring and thermostat.
  8. Remove thermostat housing bolts.
To install:
A.Clean gasket sealing surfaces.
B.Install thermostat with the bleed valve located at the 12 o'clock position, between tabs on seal.
  1. Install thermostat and seal into thermostat housing .
  2. If removed, install two studs.
  3. Install thermostat, thermostat housing and O-ring and bolt. Tighten attaching bolts to 105 inch lbs.(12 Nm).
  4. Lubricate new heater return tube O-ring with coolant.
  5. Position heater return tube flange over two studs. Install nuts.
  6. Tighten retaining nuts to 53 inch lbs.(6 Nm).
  7. Tighten starter bolt to 40 ft. lbs. (54.3 Nm).
  8. Connect the lower radiator hose to the thermostat housing. Install hose clamps.
  9. Refill cooling system.
  10. Inspect for leaks.
  11. Connect negative cable.
3.2 and 3.5L engines:
Disconnect the battery cable. (Again engine COLD)
  1. Drain cooling system.
  2. Raise vehicle on hoist.
  3. Disconnect electrical connectors from engine oil and power steering pressure switches.
  4. Disconnect radiator and heater hoses from thermostat housing.
  5. Remove thermostat housing bolts.
  6. Remove housing, thermostat, and gasket.
The OEM thermostat is staked in place at the factory. To ensure proper seating of replacement thermostat, carefully remove the bulged metal from the thermostat housing, using a suitable hand held grinder. It is not necessary to restake the replacement thermostat, into the thermostat housing.

To Install:
  1. Position gasket on thermostat and housing.
  2. Install thermostat housing, gasket and mounting bolts onto block. Tighten attaching bolts to 105 inch lbs. (12 Nm).
  3. Install radiator hose.
  4. Install bypass hose.
  5. Connect electrical connectors from engine oil and power steering pressure switches.
  6. Connect negative cable.
  7. Fill cooling system.
  8. Inspect for leaks.
  9. Lower vehicle on hoist.
From AutoZone Repair Guides

I feel this way, I can give you an accurate description, and have taken into account your safety.

May 12, 2009 | 1999 Chrysler 300M

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