Question about 2002 Buick Rendezvous

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My 2002 Buick Rendevous has a hot coolant

My 2002 Buick Rendevous CXL ( 6 cyl/3.4 litre engine), recently developed a hot coolant temperature problem. To correct the problem, I started by having the radiator flushed and refilled with Dextron. After that didn't fix it, I bought a new thermostat. When I went to replace the old one with the new one, I found that it had previously been removed, probably before I bought the car 3 years ago. What should I do to fix it?

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Install the new thermostat (make sure it is the right temp). This will allow for your coolant to stay long enough in the radiator to cool down.

If that does not fix it, check radiator cap, belt that turns the water pump and the water pump itself along with its pulley.

There is also the possibility that the coolant temperature sensor is giving off false readings, that the coolant system is clogged or your engine fan is not operating when it should be.

Posted on May 03, 2010

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Posted on Jan 02, 2017

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Is the 2002 Buick Rendevous 3.4L CXL water pump driven by the timing belt?


no, it runs on the serpentine belt:



3.4L Engine

  1. Before servicing the vehicle, refer to the Precautions Section.
  2. Drain the coolant from the engine.
  3. Remove or disconnect the following:

    Negative battery cable Serpentine drive belt guard Loosen the water pump pulley bolts Serpentine drive belt Water pump pulley Water pump Water pump gasket

To install:
  1. Clean the gasket mounting surfaces.
  2. Install or connect the following:

    Gasket Water pump. Torque the bolts to 89 inch lbs. (10 Nm). Water pump pulley and hand-tighten the bolts at this time Serpentine drive belt Water pump pulley bolts to 18 ft. lbs. (25 Nm) Serpentine drive belt guard
  3. Fill the cooling system.
  4. Start the engine and check for leaks, repair if necessary.
  5. Road test the vehicle and verify there is no air in the cooling system.

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I have replace the thermostat on my 2002 buick rendevous, bled the air out of the two hoses, flushed raditor and its still running hot what next?


check the radiator itself for dust, flyes, muck, etc remove front grill and power wash rad then add a good coolant will run at 80-90 deg anyway if fan is cuting in then there isnt a problem. hope this helps

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