Question about 1993 Isuzu Rodeo

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Coolant leak on top of engine behind thermostat housing unit.

Coolant by-pass hose is in that area too....plus "o"rings.

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  • bmbergak Feb 08, 2009

    I have similar problem. It leaks behind theromostat and the area around. I noticed steam coming out of that area. I live in Alaska so its cold here. It does leak coolant but very little. Any suggestions would be helful I think the head gasket is going out.

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On the back of the motor under the plentium the there is a coolant tube with o-rings the go bad found that in mine need to remove plentium and intake off i hade to get the parts from the dealer

Posted on Feb 13, 2009

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How to change thermostat


the radiator is filled to the top with coolant and the engine is run without the radiator cap in place, the coolant will expand and spill over as the engine warms up.
  • Drain some coolant into a clean container until the coolant level is below the thermostat housing.
  • Remove the upper radiator hose connection from the thermostat housing.
  • Loosen the housing bolts and remove the housing.
  • Remove the gasket and scrape it carefully from the surface of the housing and the mounting surface on the engine. If the gasket remains on either of the surfaces, there will probably bea coolant leak after reassembly. Some engines use a rubber O-ring to seal a thermostat housing.
  • Compare the size of the thermostat to the old one. They are of different sizes, types, and temperature ratings.
  • The temperature rating is stamped on the sensing bulb on the bottom of the thermostat. The temperature bulb faces the block.
  • When replacing a thermostat, be sure that the thermostat fits into the groove in the block or outlet housing. If the thermostat is installed upside down, the engine will overheat.
  • Install the gasket.
  • Reinstall the thermostat housing. Refill the system and run the engine or pressure test to check for leaks.
  • When the engine has reached operating temperature make sure the thermostat opens.
  • You should be able to see coolant circulating within the radiator.
  • Another way of checking thermostat operation is to feel the top of the radiator hose or use a thermometer or multimeter with a temperature probe to confirm that the coolant is warming up.
  • If the engine is overheating, but the top hose is still cool to the touch, the thermostat is stu

    CAUTION
    If the radiator is filled to the top with coolant and the engine is run without the radiator cap in place, the coolant will expand and spill over as the engine warms up.

    • Drain some coolant into a clean container until the coolant level is below the thermostat housing.
    • Remove the upper radiator hose connection from the thermostat housing.
    • Loosen the housing bolts and remove the housing.
    • Remove the gasket and scrape it carefully from the surface of the housing and the mounting surface on the engine. If the gasket remains on either of the surfaces, there will probably bea coolant leak after reassembly. Some engines use a rubber O-ring to seal a thermostat housing.
    • Compare the size of the thermostat to the old one. They are of different sizes, types, and temperature ratings.
    • The temperature rating is stamped on the sensing bulb on the bottom of the thermostat. The temperature bulb faces the block.
    • When replacing a thermostat, be sure that the thermostat fits into the groove in the block or outlet housing. If the thermostat is installed upside down, the engine will overheat.
    • Install the gasket.
    • Reinstall the thermostat housing. Refill the system and run the engine or pressure test to check for leaks.
    • When the engine has reached operating temperature make sure the thermostat opens.
    • You should be able to see coolant circulating within the radiator.
    • Another way of checking thermostat operation is to feel the top of the radiator hose or use a thermometer or multimeter with a temperature probe to confirm that the coolant is warming up.
    • If the engine is overheating, but the top hose is still cool to the touch, the thermostat is stuck closed and must be replaced.
    NOTE When a paper gasket is used and the recess is in the thermostat housing, it is a good practice to position the thermostat into the recess and glue the gasket to hold it in place. If it falls out of its groove during installation, the outlet housing can be cracked or a coolant leak will result. Before tightening the water outlet housing, try to rock it back and forth to be sure it is flush. Housings are often cracked during this step.ck closed and must be replaced.
NOTE When a paper gasket is used and the recess is in the thermostat housing, it is a good practice to position the thermostat into the recess and glue the gasket to hold it in place. If it falls out of its groove during installation, the outlet housing can be cracked or a coolant leak will result. Before tightening the water outlet housing, try to rock it back and forth to be sure it is flush. Housings are often cracked during this step

May 07, 2012 | 1998 Mercury Mystique

1 Answer

How do you replace the thermostat


Partially drain coolant level to below thermostat level if nessasary. Follow top radiator hose over to engine. Where the top radiator hose stops at engine is where the thermostat is. Hose is connected to a pipe ( called a thermostat housing) that bolts to the engine. Remove components if they are in the way of accessing the two bolts or nuts that hold down the thermostat housing. Remove thermostat housing. Thermostat is under the housing. Replace thermostat and paper gasket or rubber o-ring. Be sure to clean surfaces of area where the gasket is mounted. Reinstall thermostat housing but do not over tighten the housing bolts or nuts. Reinstrall components removed and refill coolant to proper level. Do not forget to close radiator drain. Do not put radiator cap on at this time. Start engine and let run for a few minutes to get air out of system. Stop engine and refill coolant if needed. Install radiator cap and check coolant resevoir and fill to proper level if needed. Hope this helps.

Nov 26, 2010 | 2005 Pontiac Grand Prix

2 Answers

I need to replace the thermostat it is sticking


DRAIN COOLANT LEVEL DOWN BELOW THERMOSTAT.PLACE DRAIN PAN UNDER VECHICLE TO CATCH ANTIFREEZE.WHEN DONE PUT ANTIFREEZE SAFE PLACE FROM KIDS AND ANIMALS.WHEN DONE DRAINING SOME ANTIFREEZE.FOLLOW RADIATOR HOSE TO TOP OF INTAKE TO THERMOSTAT HOUSING. LOOSEN HOSE CLAMP REMOVE RADIATOR HOSE FROM THERMOSTAT HOUSING.THEN LOOSEN HOUSING BOLTS.REMOVE THERMOSTAT HOUSING AND THERMOSTAT.CLEAN BOTH THE THERMOSTAT HOUSING SURFACE AND INTAKE SURFACE YOU CAN USE ACETATE OR BRAKE CLEANER AND SCOTCH BRITES ROLL OF CLEAN PAPER TOWEL. AFTER CLEANING HOUSING AND INTAKE SURFACE MAKE SURFACE CLEAN SMOOTH FROM THE DEBRIS WHEN DONE. TAKE THERMOSTAT PUT GASKET SEALER ON BOTH SIDES OF GASKET PUT GASKET TO THERMOSTAT HOUSING MAKE SURE GASKET AND THERMOSTAT HOUSING HOLES ALIGN CORRECTLY.NOW PLACE NEW THERMOSTAT IN PLACE IN THE INTAKE.MAKE SURE THERMOSTAT SPRING END GOES TOWARD ENGINE FACING DOWN.THEN INSTALL THERMOSTAT HOUSING WITH GASKET TO THE INTAKE.TORQUE THERMOSTAT HOUSING BOLTS TO 20 FT LBS.WAIT 1 HOUR BEFORE POURING ANTIFREEZE BACK IN THE COOLANT SYSTEM GIVE THERMOSTAT GASKET SEALER LITTLE TIME TO CURE.SO YOU WONT HAVE COOLANT LEAKS.NOW IF THERMOSTAT HAS THE LARGE O- RING ON IT YOU DONT HAVE A THERMOSTAT HOUSING GASKET THE THERMOSTAT O- RING IS THE SEAL THAT HOLDS COOLANT INSTEAD OF GASKET.WHEN THERMOSTAT AND HOUSING IN PLACE.INSTALL RADIATOR HOSE TO THERMOSTAT HOUSING TIGHTEN HOSE CLAMP.THEN FILL RADIATOR BACK UP WITH THE COOLANT YOU DRAIN OUT.START VECHICLE UP. THEN CHECK FOR LEAKS.

Nov 03, 2010 | 1992 Buick LeSabre

3 Answers

Cannot find engine thermostat for 97 nisson pu 2.4 4cyl. engine


its usually where the top radiaotr hose ends on the engine.

Aug 26, 2010 | 1997 Nissan Pickup

2 Answers

How do i change a thermostat on a 1996 mercury sable and whre is it located


Thermostat-follow the upper radiator thick hose to the thermostatic housing. Removal & Installation 3.0L (2V) To Remove:
  1. Before servicing the vehicle refer to the precautions in the beginning of this section.
  2. Drain the engine cooling system into a suitable container.
  3. Remove the three thermostat housing bolts.
  4. Remove the thermostat O-ring seal.
  5. Inspect and clean the sealing surfaces.
To Install:
  1. Install thermostat and o-ring seal.
  2. Install thermostat housing bolts; torque to 9 lb-ft (12 Nm).
  3. Refill cooling system.
  4. Warm-up vehicle and check for leaks.
  5. Top off cooling system.
3.0L (4V) To Remove:
  1. Drain the engine cooling system.
  2. Disconnect the lower radiator hose from the water inlet adapter.
  3. Remove the bolts, the water outlet adapter and thermostat. Discard the O-ring seal.
To Install:
  1. Clean the sealing surfaces.
  2. Install the thermostat with a new gasket. Tighten the bolts to 89 in-lb (10 Nm).
  3. Refill the cooling system.
  4. Warm-up the vehicle and check for leaks.
  5. Top off the cooling system.
3.4L (SHO) To Remove:
  1. Drain the engine cooling system.
  2. Remove battery.
  3. Remove power distribution box.
  4. Remove battery tray.
  5. Disconnect upper radiator hose and place it out of the way.
  6. Disconnect the lower radiator hose from the water inlet connection.
  7. Remove the two mounting bolts and remove the water inlet connection.
  8. Remove the O-ring seal and thermostat from the water pump.
  9. Inspect O-ring for damage and replace if necessary.
To Install:
  1. If necessary, install a new O-ring on the inlet connection.
  2. Install the thermostat in the water pump and install the inlet housing. Tighten the bolts to 71-106 lb-in (8-12 Nm).
  3. Connect the lower radiator hose to the water inlet connection.
  4. Install the upper radiator hose.
  5. Install battery tray.
  6. Install the power distribution box.
  7. Install the battery.
  8. Refill the engine with coolant.
  9. Start the engine and allow the engine to warm up so that the water thermostat opens. Check for leaks.
  10. Stop the engine. Allow the engine to cool and top off degas bottle as required to maintain minimum cold fill level.
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Aug 03, 2010 | 1996 Mercury Sable

1 Answer

I need a duagram on replacing a thermostat 1994 mazda b2200 4cyl pickup


Mazda Trucks 1987-1993 Repair Guide
Thermostat printpage_icon.gif

REMOVAL AND INSTALLATION

If the replacement thermostat is equipped with a &inch;jiggle pin&inch;, the pin must be install facing upwards toward the top of the engine (12 o'clock), and should be on the side facing the water outlet. When installing the thermostat gasket, the seal print side should face the cylinder head.
2.2L Engine
See Figure 1
  1. Drain enough coolant to bring the coolant level down below the thermostat housing. the thermostat housing is located on the left front side of the cylinder block.


CAUTION When draining the coolant, keep in mind that cats and dogs are attracted by the ethelyne glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.
  1. Disconnect the temperature sending unit wire.
  2. Remove the coolant outlet elbow.
  3. If so equipped, position the vacuum control valve out of the way. The vacuum control valve is not used on California trucks.
  4. Disconnect the coolant by-pass hose from the thermostat housing.
  5. Remove the thermostat and housing from the engine.
  6. Note the position of the jiggle pin and remove the thermostat from the housing.
  7. Remove all gasket material from the parts.
e0283c4.jpg

Fig. 1: Thermostat installation

To install:

  1. Position the thermostat in the housing with the jiggle pin up. Coat a new gasket with sealer and install it on the thermostat housing.
  2. Install the thermostat housing using a new gasket with water resistant sealer. Tighten the bolts to 14-19 ft. lbs. (19-25 Nm).
  3. Install the coolant outlet elbow and vacuum control valve (if equipped).
  4. Connect the by-pass and radiator hoses.
  5. Connect the temperature sending unit wire.
  6. Fill the cooling system with the proper coolant. Operate the engine and check the coolant lever. Check for leaks.

Hope helps with this (remember rated this).

May 30, 2010 | 1998 Mazda Pickup

1 Answer

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.

280c20b.gif
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.

57a3857.gif
Thermostat installation—4.6L Engine


3b692a6.gif
Loosen the upper radiator hose clamp at the thermostat housing


d0a7ab0.gif
Remove the upper radiator hose clamp from the thermostat housing


d22f120.gif
Remove the thermostat housing retaining bolts and . . .





d497806.gif
. . . remove the thermostat housing from the engine


c2d4b5e.gif
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

How to replace thermostat?


CAUTION
If the radiator is filled to the top with coolant and the engine is run without the radiator cap in place, the coolant will expand and spill over as the engine warms up.
  • Drain some coolant into a clean container until the coolant level is below the thermostat housing.
  • Remove the upper radiator hose connection from the thermostat housing.
  • Loosen the housing bolts and remove the housing.
  • Remove the gasket and scrape it carefully from the surface of the housing and the mounting surface on the engine. If the gasket remains on either of the surfaces, there will probably bea coolant leak after reassembly. Some engines use a rubber O-ring to seal a thermostat housing.
  • Compare the size of the thermostat to the old one. They are of different sizes, types, and temperature ratings.
  • The temperature rating is stamped on the sensing bulb on the bottom of the thermostat. The temperature bulb faces the block.
  • When replacing a thermostat, be sure that the thermostat fits into the groove in the block or outlet housing. If the thermostat is installed upside down, the engine will overheat.
  • Install the gasket.
  • Reinstall the thermostat housing. Refill the system and run the engine or pressure test to check for leaks.
  • When the engine has reached operating temperature make sure the thermostat opens.
  • You should be able to see coolant circulating within the radiator.
  • Another way of checking thermostat operation is to feel the top of the radiator hose or use a thermometer or multimeter with a temperature probe to confirm that the coolant is warming up.
  • If the engine is overheating, but the top hose is still cool to the touch, the thermostat is stuck closed and must be replaced.
NOTE When a paper gasket is used and the recess is in the thermostat housing, it is a good practice to position the thermostat into the recess and glue the gasket to hold it in place. If it falls out of its groove during installation, the outlet housing can be cracked or a coolant leak will result. Before tightening the water outlet housing, try to rock it back and forth to be sure it is flush. Housings are often cracked during this step.

May 22, 2010 | 2000 Oldsmobile Alero

2 Answers

I have a 98 lincoln town car executive and I need to know how you change the thermostat


1. drain coolant
2. remove engine cover
3. remove the 2 bolts from water hose connection (upper rad hose connecting to)
4. remove o-ring and thermostat
5. repeat in reverse order

Feb 05, 2010 | 1998 Lincoln Continental

1 Answer

Thermostat housing replacement


These are the steps to replace the thermostat but are applicable to remove and replace the housing also. 2.0L DOHC Zetec Engine WARNING Do not mix Standard (green) Coolant with Extended Life Coolant (orange). If mixing occurs, drain engine cooling system and refill with originally equipped coolant type. If this contamination occurs the service change interval on Extended Life Coolant will be reduced from 6 years/150,000 miles to 3 years/30,000 miles.

  1. Disconnect the battery ground cable.
  2. Drain the engine coolant to a point below the water thermostat.
  3. Disconnect the connector from the camshaft position sensor.
  4. Remove the bolts and move to one side the water hose connection.
  • Remove the water thermostat and seal from the water thermostat housing.
  • Inspect the seal and the water thermostat.
  • To install:
    1. Replace the thermostat and seal into the housing.
    2. Connect the connector to the camshaft position sensor.
    3. Fill the cooling system.
    4. Start the engine and check all hoses and connections for leaks. Allow the engine to warm up so that the water thermostat opens.
    5. Stop the engine. Top off the coolant recovery reservoir as necessary to maintain minimum cold fill level.
    e990057.gif

    2.0L SOHC Spi Engine
    1. Disconnect the battery ground cable.
    2. Remove the air cleaner outlet tube.
    3. Drain the engine coolant to a point below the water thermostat.
    4. Disconnect the water temperature indicator sender unit and the engine coolant temperature sensor electrical connectors.
    5. Disconnect the upper radiator hose and the heater coolant hose from the water thermostat housing.
    6. Remove the water thermostat housing bolts, the water thermostat housing, and the water thermostat.
    To install:
    NOTE Make sure all of the gasket surfaces are free of all gasket material. Make sure the tabs on the engage properly into slots in thermostat housing.

    1. Install the thermostat housing bolts, thermostat housing and the thermostat.
    2. Connect the upper radiator hose and the heater coolant hose to the thermostat housing.
    3. Connect the water temperature indicator sender unit and the engine coolant temperature sensor electrical connectors.
    4. Fill the cooling system with only Ford Premium Engine Coolant E2FZ-19549-AA (in Oregon F5FZ-19549-CC, in Canada, Motorcraft CXC-8-B) or equivalent meeting Ford specification in a 50/50 mixture with water.
    5. Start the engine and check all hoses and connections for leaks. Allow the engine to warm up so that the water thermostat opens.
    6. Stop the engine. Top off coolant recovery reservoir as required to maintain minimum cold fill level.

    Dec 07, 2009 | 2000 Ford Escort

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