Question about 1998 Mazda Pickup

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Where are the bolts for thermostat housing

B2500 p/u 2.5l engine

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Follow the lower hose on your radator to the engine block, remove the hose and it should be right there, look at the way it is put in so you do not put it back in upside down and cause real problems.

Posted on Oct 29, 2012

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Hello jonah! i need to replace a thermostat on my 2004 chevy colorado, 3.5 litre engine can you tell me where it is located on my engine?


Check this procedure for Canyon, Colorado 2004-2005 - Removal & Installation
  1. Drain the cooling system.
  2. Raise and support the vehicle only high enough to access the thermostat housing through the wheelhouse.
  3. Remove the left wheelhouse liner.
  4. Remove the radiator inlet hose from the thermostat housing.
  5. Remove the thermostat housing bolts.
  6. Remove the thermostat housing from the engine block.
  7. Clean and inspect the thermostat housing.
  8. Clean and inspect the sealing surface of the engine block.
To install:
  1. Position the thermostat housing to the engine block.
  2. Install the thermostat housing bolts and tighten to 89 inch lbs. (10 Nm).
  3. Connect the radiator inlet hose to the thermostat housing.
  4. Install the left wheelhouse liner.
  5. Lower the vehicle.
  6. Fill the cooling system.
  7. Inspect all sealing surfaces for leaks after starting the engine.
  1. Drain the cooling system.
  2. Raise and support the vehicle only high enough to access the thermostat housing through the wheelhouse.
  3. Remove the left wheelhouse liner.
  4. Position the hose clamp pliers to the clamp to remove the radiator inlet hose from the thermostat housing.
  5. Remove the thermostat housing bolts.
  6. Remove the thermostat housing from the engine block.
  7. Clean and inspect the thermostat housing.
  8. Clean and inspect the sealing surface of the engine block.
To install:
  1. Position the thermostat housing to the engine block.
  2. Install the thermostat housing bolts and tighten to 89 inch lbs. (10 Nm).
  3. Connect the radiator inlet hose to the thermostat housing.
  4. Install the left wheelhouse liner.
  5. Lower the vehicle.
  6. Fill the cooling system.
  7. Inspect all sealing surfaces for leaks after starting the engine.
Hope helps (remember to rating this answer).

Oct 06, 2011 | 2004 Chevrolet Colorado

2 Answers

Where is thermostat on my 2005 chevy classic


Thermostat Removal & Installation 2.2L Engine 2004-2005 To Remove:
  1. Drain the cooling system. chevy_cav_02-04_tstat.gif
  2. Remove the thermostat housing-to-water pump feed pipe bolts. chevy_cav_02-04_feedpipe.gif
  3. Remove the water pump feed pipe from the thermostat housing .
  4. Remove the thermostat from the housing.
To Install:
  1. Install the thermostat on the housing.
  2. Install the water pump feed pipe on the thermostat housing with the mounting bolts. Tighten 89 in-lb (10 Nm).
  3. Fill the cooling system.
2006-2007 To Remove:
  1. Drain the cooling system.
  2. Disconnect the radiator outlet hose from the surge tank and thermostat housing cover. Thermostat & cover gm-03-39-3601.gif
  3. Remove the mounting bolts and remove the thermostat housing cover.
  4. Remove the thermostat from the housing. Discard the O-ring.
To Install:
  1. Using a new O-ring, install the thermostat on the housing.
  2. Install the thermostat housing cover with the mounting bolts. Tighten 89 in-lb (10 Nm).
  3. Connect the radiator outlet hose to the surge tank and thermostat housing cover.
  4. Fill the cooling system.
3.5L Engine (LZ4) W/ Variable Valve Timing & 3.9L Engine To Remove:
  1. Drain the cooling system.
  2. Remove the air cleaner outlet duct.
  3. Disconnect the radiator outlet hose from the thermostat housing. Thermostat 3.9L gm-03-00-3054.gif
  4. Remove the mounting bolt/stud and remove the thermostat housing.
  5. Remove the thermostat from the engine.
  6. Clean the sealing surfaces.
To Install:
  1. Using a new gasket, install the thermostat on the engine.
  2. Install the thermostat housing with the mounting bolts. Tighten 89 in-lb (10 Nm).
  3. Connect the radiator outlet hose to the thermostat housing.
  4. Install the air cleaner outlet duct.
  5. Fill the cooling system.
  6. Check the cooling system for leaks.
3.5L Engine (LX9) W/O Variable Valve Timing To Remove:
  1. Drain the coolant.
  2. Disconnect the radiator hose from the thermostat housing. Thermostat 3.5L gm_mv_ven_tstat.gif
  3. Remove the mounting bolt/stud and remove the thermostat housing.
  4. Remove the housing gasket.
  5. Remove the thermostat.
  6. Clean the mating surfaces.
To Install:
  1. Install the thermostat on the engine.
  2. Install the thermostat housing and gasket with the mounting bolts. Tighten 18 ft-lb (25 Nm).
  3. Connect the radiator hose to the thermostat housing.
  4. Fill the cooling system.
  5. Check the cooling system for leaks.

Jan 29, 2011 | 2005 Chevrolet Malibu

1 Answer

Location of thermostat on 2002 olds alero 2.2


Thermostat Removal & Installation 2.2L Engine To Remove:
  1. Remove the exhaust manifold. If equipped with an automatic transmission.
  2. Drain the cooling system.
  3. Remove or disconnect the following: chevy_cav_02-04_tstat.gif

    • Thermostat housing to water pump feed pipe bolts. chevy_cav_02-04_feedpipe.gif

    • Thermostat housing to water pump feed pipe.
    • Thermostat.
To Install:
  1. Install or connect the following:
    • Thermostat.
    • Thermostat housing to water pump feed pipe.
    • Thermostat housing to water pump feed pipe bolt.
      1. Tighten bolt to 89 in lbs (10 Nm).
    • Exhaust manifold if equipped with an automatic transmission.
  2. Fill the cooling system.
2.4L Engine To Remove:
Thermostat assembly 2.4L 87953024.gif

  1. Drain the cooling system.
  2. Remove the exhaust manifold heat shield.
  3. Remove the coolant inlet housing mounting bolts through the exhaust manifold.
  4. Raise and safely support the vehicle.
  5. Remove the coolant inlet housing stud from the oil pan.
  6. Remove wheel and tire assembly.
  7. Remove the engine splash shield.
  8. Remove the mounting bolts from the transaxle-to-engine block support. Remove the support.
  9. Remove the coolant housing pipe.
  10. Remove the thermostat.
  11. Clean the mating surfaces.
To Install:
  1. Install the thermostat.
  2. Install the coolant housing pipe.
  3. Install and secure the transaxle support-to-engine block mounting bolts.
  4. Install the engine splash shield.
  5. Install the wheel and tire assembly.
  6. Install the coolant inlet housing stud to the oil pan.
    • Tighten to 19 ft lb (26 Nm).
  7. Lower the vehicle.
  8. Install the coolant inlet housing bolts through the exhaust manifold.
    • Tighten the coolant inlet housing bolts to 10 ft lb (14 Nm).
  9. Install the exhaust manifold heat shield.
  10. Fill the cooling system.
  11. Inspect the system for leaks.
3.4L Engine To Remove:
  1. Drain the cooling system.
  2. Remove the air cleaner.
  3. Remove exhaust crossover pipe.
  4. Disconnect the surge tank line fitting from the coolant outlet.
  5. Remove the thermostat housing to intake manifold bolts.
  6. Remove the thermostat housing outlet and thermostat.
To Install:
  1. Install the thermostat and housing outlet.
  2. Install the thermostat housing bolts.
    • Tighten the thermostat housing bolts to 18 ft lb (25 Nm).
  3. Install exhaust crossover pipe.
  4. Connect the surge tank line fitting to the coolant outlet.
    • Tighten the fittings to 15 ft lb (21 Nm).
  5. Install the air cleaner.
  6. Fill the cooling system.
  7. Inspect the system for leaks
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Oct 14, 2010 | Oldsmobile Alero Cars & Trucks

2 Answers

How to replace a themostat on a 2004 Gmc Envoy


Please see my tip at http://www.fixya.com/cars/r5929960-s_thermostat .

Specific instructions for your car are as follows. Let me know if you get stuck or have more questions.


Removal & Installation


4.2L Engine

  1. Remove the necessary coolant from the radiator.
  2. Remove the alternator, as outlined in the Engine Electrical Section.
  3. Loosen the outlet hose clamp at the thermostat housing. Remove the outlet hose from the thermostat housing.
  4. Remove the thermostat housing bolts.
  5. Remove the thermostat housing from the engine block.
  6. Clean all of the surfaces of the thermostat housing.
  7. Clean the sealing surface of the engine block.
To install:
  1. Install the thermostat housing to the engine block.
  2. Install the thermostat housing bolts and tighten to 89 inch lbs. (10 Nm).
  3. Lubricate the inner diameter of the radiator hose with engine coolant.
  4. Install the outlet hose to the thermostat housing. Secure the hose with the clamp.
  5. Install the alternator.
  6. Fill the cooling system with specified coolant and concentration.
  7. Inspect all sealing surfaces for leaks after starting the engine.

5.3L Engine
NOTE The thermostat is not serviceable separately. The water pump inlet and thermostat must be replaced as an assembly.


  1. Drain the cooling system to a level below the thermostat.
  2. Remove the radiator outlet hose.
  3. Remove the water pump inlet bolts.
  4. Remove the water pump inlet and thermostat from the water pump.

To install:
  1. Install the thermostat and thermostat housing to the water pump.
  2. Install the thermostat housing bolts. Tighten the bolts to 11 ft. lbs. (15 Nm).
  3. Install the radiator outlet hose.
  4. Properly fill the engine cooling system and check for leaks.

Oct 08, 2010 | 2004 GMC Envoy

2 Answers

Where is the thermostat on a 2.2l ohc engine?


Removal & Installation 2.2L VIN 4 To Remove:
  1. Drain the cooling system.
  2. Remove the lower radiator hose from thermostat housing.
  3. Remove the thermostat housing bolts and outlet.
  4. Remove the thermostat.
  5. Clean the mating surfaces.
To Install:
  1. Install the thermostat.
  2. Install the thermostat housing and bolts.
  3. Install the coolant housing bolts. Tighten bolts to 14 Nm (10 ft. lbs.).
  4. Install the lower radiator hose to thermostat housing.
  5. Fill the cooling system.
  6. Inspect for leaks.
2.2L VIN F To Remove:
  1. Remove the exhaust manifold. If equipped with an automatic transmission.
  2. Drain the cooling system.
  3. Remove or disconnect the following: chevy_cav_02-04_tstat.gif

    • Thermostat housing to water pump feed pipe bolts. chevy_cav_02-04_feedpipe.gif

    • Thermostat housing to water pump feed pipe.
    • Thermostat.
To Install:
  1. Install or connect the following:
    • Thermostat.
    • Thermostat housing to water pump feed pipe.
    • Thermostat housing to water pump feed pipe bolt. Tighten bolt to 10 Nm (18 in. lbs.).
    • Exhaust manifold. If equipped with an automatic transmission.
  2. Fill the cooling system.
2.4L VIN T To Remove:
  1. Drain the cooling system.
  2. Remove the exhaust manifold heat shield bolts and shield. cavman.gif

    cavtstat.gif

  3. Remove the coolant inlet housing bolts.
  4. Lift vehicle.
  5. Remove the coolant inlet housing stud from the oil pan.
  6. Remove the wheel.
  7. Remove the right engine splash shield.
  8. Remove the transaxle-to-engine block brace bolts and brace.
  9. Remove the radiator outlet pipe.
  10. Remove the thermostat.
  11. Clean the mating surfaces.
To Install:
  1. Clean the mating surfaces.
  2. Install the thermostat.
  3. Install the radiator outlet pipe.
  4. Install the transaxle-to-engine block brace and install bolts.
  5. Install the right engine splash shield.
  6. Install the wheel.
  7. Lower the vehicle.
  8. Install the exhaust manifold heat shield and bolt.
  9. Tighten the exhaust manifold heat shield bolts to 14 Nm (10 ft. lbs.).
  10. Fill the cooling system.
  11. Inspect the system for leaks.
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Sep 09, 2010 | 2003 Pontiac Sunfire

1 Answer

Location of engine thermostat


Removal & Installation 3.0L Engine To Remove:
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section
  2. Drain the engine cooling system
  3. Remove or disconnect the following:
    • Air cleaner outlet tube
    • Hoses and remove the thermostat housing assembly
    • Bolts separate the housing and remove the thermostat and seal
To Install:
  1. Install or connect the following:
    • New seal and thermostat. Torque bolts to 8 ft-lbs (11 Nm)
    • Hoses to assembly
    • Air cleaner outlet tube
3.9L Engine To Remove:
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section
  2. Drain the engine cooling system
  3. Remove or disconnect the following:
    • Intake manifold
    • Nuts and remove the hose bracket
    • Stud bolts
    • Lower radiator hose from the thermostat housing
    • Bolts and thermostat housing cover
    • Thermostat and seal
To Install:
  1. Install or connect the following:
    • New seal and thermostat
    • Housing cover. Torque bolts to 8 ft-lbs (11 Nm)
    • Lower radiator hose to the thermostat housing
    • Stud bolts. Torque to 10 ft-lbs (13 Nm)
    • Hose bracket. Torque nuts to 89 in-lbs (10 Nm)
    • Intake manifold

Aug 17, 2010 | 2000 Lincoln LS

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.

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 change the thermostat


Alero, Grand Am 1999-2005 Thermostat - Removal & Installation 2.2L Engine
  1. If equipped with an automatic transaxle, remove the exhaust manifold, as outlined in this section.
  2. Drain the cooling system.
  3. Remove the thermostat housing to water pump feed pipe bolts.
  4. Remove the thermostat housing to water pump feed pipe.

    d1db35e.jpg
    Fig. Thermostat mounting-2.2L engine
  5. Remove the thermostat.

To install:
  1. Install the thermostat.
  2. Install the thermostat housing to water pump feed pipe.
  3. Install the thermostat housing to water pump feed pipe bolt. Tighten the thermostat housing to water pump feed pipe bolt to 89 inch lbs. (10 Nm).
  4. If equipped with an automatic transaxle, install the exhaust manifold, as outlined in this section.
  5. Fill the cooling system.

3.1L Engines
  1. Disconnect the negative battery cable.
  2. Drain the cooling system to a level below the thermostat housing.
  3. Remove the air cleaner assembly.
  4. Disconnect the surge tank line from the thermostat housing.
  5. Remove thermostat housing-to-intake manifold attaching bolt and nut, then remove the housing.
  6. Remove the thermostat.

To install:
  1. Clean all gasket surfaces completely.
  2. Insert the thermostat in the intake manifold.
  3. Attach the thermostat housing to the intake manifold.
  4. Install the mounting bolt and nut. Tighten to 18 ft. lbs. (25 Nm).
  5. Install the air cleaner assembly.
  6. Connect the surge tank line to thermostat housing.
  7. Refill the cooling system.
  8. Connect the negative battery cable, remove the radiator cap, then start the engine. Allow the engine to run with radiator cap removed, until the upper radiator hose becomes hot (thermostat open). With the engine idling, add coolant to the radiator until the level is up to the bottom of the filler neck.
  9. Install the radiator cap, making sure the arrows line up with the overflow tube.

3.4L Engine
  1. Drain the cooling system.
  2. Remove the air cleaner.
  3. Remove exhaust crossover pipe.
  4. Disconnect the surge tank line fitting from the coolant outlet.
  5. Remove the thermostat housing to intake manifold bolts.
  6. Remove the thermostat housing outlet and thermostat
  7. Clean the mating surfaces.

To install:
  1. Install the thermostat and housing outlet.
  2. Install the thermostat housing bolts. Tighten the thermostat housing bolts to 18 ft. lbs. (25 Nm).
  3. Install exhaust crossover pipe.
  4. Connect the surge tank line fitting to the coolant outlet. Tighten the fittings to 15 ft. lbs. (21 Nm).
  5. Install the air cleaner.
  6. Fill the cooling system.
  7. Inspect the system for leaks.
Hope this help (remember comment and rated this).

Apr 04, 2010 | 1999 Oldsmobile Alero

1 Answer

Want to know how to change a thermostat on my 2004


It Depends on which engine you have, this is how it goes for both. I use a little RTV with a new ring as well.

THERMOSTAT REPLACEMENT (4.2L ENGINE)
Removal Procedure
1. Remove the necessary coolant from the radiator.
2. Remove the generator.
3. Loosen the outlet hose clamp at the thermostat housing. Remove the outlet hose from the thermostat housing.
4. Remove the thermostat housing bolts.
5. Remove the thermostat housing from the engine block.
6. Clean all of the surfaces of the thermostat housing.
7. Clean the sealing surface of the engine block.
Installation Procedure
1. Install the thermostat housing to the engine block.
2. Install the thermostat housing bolts.
Tighten: Tighten the bolts to 10 N.m (89 lb in).
3. Lubricate the inner diameter of the radiator hose with engine coolant.
4. Install the outlet hose to the thermostat housing. Secure the hose with the clamp.
5. Install the generator.
6. Fill the cooling system with specified coolant and concentration. Follow the correct cooling systen bleed procedure for your engine.
7. Inspect all sealing surfaces for leaks after starting the engine.
THERMOSTAT REPLACEMENT (5.3L ENGINE)
1. Drain Radiator and remove the radiator outlet hose.
2. Remove the water pump inlet bolts.
3. Remove the water pump inlet and thermostat from the water pump.
Installation Procedure
IMPORTANT: The thermostat is not serviceable separately. The water pump inlet and thermostat must be replaced as an assembly.
1. Install the thermostat and thermostat housing to the water pump.
2. Install the thermostat housing bolts.15 N.m
3. Install the radiator outlet hose.
4. Fill the cooling system with specified coolant and concentration. Follow the correct cooling systen bleed procedure for your engine.
5. Inspect all sealing surfaces for leaks after starting the engine.

Mar 17, 2010 | 2004 GMC Envoy

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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