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How to install thermastat in 1500 chevy pickup 1994

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Gasoline Engines
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. Drain the radiator until the coolant is below the thermostat level (below
    the level of the intake manifold).
  2. Remove the water outlet elbow assembly from the engine. Remove the
    thermostat from the engine, or, on the 4.8L, from inside the adapter elbow.
    To install:

  3. Clean the gasket surfaces on the water outlet elbow and the intake manifold.
    Use a new gasket when installing the elbow to the manifold.
  4. Install the new thermostat making sure the spring side is inserted into the
    engine, or, on the 4.8L, downward into the thermostat housing. Tighten the
    thermostat housing bolts to 20 ft. lbs. (28 Nm). On the 4.3L, 5.0L, 5.7L tighten
    the studs to 21 ft. lbs. (28 Nm). On the 7.4L tighten the bolts to 27 ft. lbs.
    (37 Nm).
  5. Refill the cooling system. Start the engine and check for leaks.

    Fig. 1: Remove the thermostat housing bolts
    how to install thermastat in - 87983p35.jpg

    Fig. 2: Remove the thermostat housing from the engine

    Fig. 3: Remove the thermostat from the housing

    Fig. 4: Thermostat housing - 4.3L engines

    Fig. 5: Thermostat housing - to install thermastat in - 84903086.gifbr />84903086.gif

    Fig. 6: Thow to install thermastat in - 84903087.gifusing - 5.0L and 5.7L engines

    Fig. 7: Thermostat housing - 7.4L engines, R/V series
    84903088.gifhow to install thermastat in - 84903089.gif>

    Fig. 8: Thermostat housing - 7.4L engines C/K series

Diesel Engines
1988-95 MODELS

  1. Remove the upper fan shroud.
  2. Drain the cooling syshow to install thermastat in - 84903090.gifnt below the thermostat.

    Fig. 9: Thermostat housing - 6.2L engines, R/V series
    8490how to install thermastat in - 84903091.gifass=

    Fig. 10: Thermostat housing - 6.2L and 6.5L diesel engines -
    1988-95 C/K series

  3. Remove the engine oil dipstick tube brace and the oil fill brace.
  4. Remove the upper radiator hose.
  5. Remove the water outlet.
  6. Remove the thermostat and gasket.
  7. Installation is the reverse of removal.
  8. Use a new gasket coated with sealer, Make sure that the spring end of the
    thermostat is in the engine. Tighten the bolts to 35 ft. lbs. (47 Nm) on 1988-91
    models and 31 ft. lbs. (42 Nm) on 1992-95 models.

1996-98 MODELS

  1. Drain the cooling system to a point below the thermostat.
  2. Disconnect the upper radiator (inlet) hose from the thermostat outlet.
  3. Ufasten the thermostat housing bolt and stud, then remove the housing.
  4. Remove the gasket and the thermostat.
  5. Clean anhow to install thermastat in - 91023g02.gifgasket from the thermostat hosing mating surfaces.

    Fig. 11: Exploded view of the thermostat assembly components
    1996-98 diesel engines

    To install:

  6. Place the thermostat into position in the housing, then install the gasket.
  7. Install the thermostat housing, the bolt and the stud. Tighten the bolt and
    stud to 31 ft. lbs. (42 Nm).
  8. Attach the upper radiator (inlet) hose to the thermostat outlet.
  9. Fill the cooling system.
  10. Start the engine with the radiator cap still removed, until the upper
    radiator hose is hot (this means the thermostat is open).
  11. With the engine idlinhow to install thermastat in - prev.gifoolant until the coolant level reaches the
    bottom of the filler neck.
  12. Inhow to install thermastat in - next.gif radiator cap making sure the arrows line up with the overflow
    tube and check for coolant leaks.

prev.gif next.gif

Posted on Oct 07, 2010


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