Mary 5/2/2012

2002 Pontiac Grand Am GT 6Cyl3.4L - Engine

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how do you change the thermostat,looks loke you have to remove half the motor

car has been overheating, coolant light on.

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  CVO 5/3/2012

  A. Check the radiator coolant level. A lack of coolant could cause the car to overheat and the coolant light on.
  
  B.
  1) Find the leak in the system and repair the leak. Make sure the water pump belt is on.
  
  2) If there is no leak then look to see if the thermostat is working: a) if one radiator hose is hot and the other cold, then the thermostat is stuck closed. b) If both hoses are hot and under pressure, then the thermostat is stuck open.
  
  3) If the thermostat is working correctly and there are no leaks: Look to see if the electric cooling fan is operating. If not: a) Diagnose to see if the fan works by applying power to it. Replace if the fan does not come on. B) If it comes on when applying power, check the fuse and relay. Replace as needed.
  
  
  C.How to replace the thermostat on the 3.4L Engine
  
  Drain the cooling system.
  Remove the air cleaner.
  Remove exhaust crossover pipe.
  Disconnect the surge tank line fitting from the coolant outlet.
  Remove the thermostat housing to intake manifold bolts.
  Remove the thermostat housing outlet and thermostat
  Clean the mating surfaces.
  
  To install:
  
  Install the thermostat and housing outlet.
  Install the thermostat housing bolts. Tighten the thermostat housing bolts to 18 ft. lbs. (25 Nm).
  Install exhaust crossover pipe.
  Connect the surge tank line fitting to the coolant outlet. Tighten the fittings to 15 ft. lbs. (21 Nm).
  Install the air cleaner.
  Fill the cooling system.
  Inspect the system for leaks.

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