Question about 1996 GMC Sierra

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My 2006 GMC p/u 4.8 is boiling over before the fans cut in.

I have changed the water pump, thermostat, and temp. sensor, but it is still boiling over at 100 degrees but it should not boil over until about 107 degrees (that's when the fans should cut in.) When I removed the temp. sensor plug, the fans cut in immediatily which indicates to me there is no circuit interuption. When I turn on the air cond. the fans also cuts in immediatily. If I crossover the fan relays the fans also start. Do anyone have any suggestions?

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  • quinlanterry Jul 13, 2009

    I have tried all of the above except pressure testing which i plan to do tomorrow. What is the correct procedure for bleeding the air. I have noticed that the hose coming from the water pump to the top of the radiator do not have much pressure. do you have any more suggestions?

  • quinlanterry Jul 14, 2009



    I already checked the coolant, it is ok.

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Check the Coolant ratio with a hydrometer to check the concentration of antifreeze in the coolant.

My 2006 GMC p/u 4.8 is boiling over before the fan - 47f0016.jpg
Increasing the concentration of antifreeze in the coolant can provide added freezing protection in really cold climates, but the maximum mix for EG antifreeze is 70%. When hot weather returns, the coolant should be diluted back to 50/50 because antifreeze cools less efficiently than water.

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Posted on Jul 14, 2009

  • blueextc3221
    blueextc3221 Jul 15, 2009

    Please accept this answer so it closes from the work queue.
    You have multiple occurances of the same question.

    Thanks :D


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Is cooling fan working?
Radiator clogged?
Air flow through radiator resrticted?
Temp gauge accurate - check with manual?
or
Are you loosing coolant?
Is coolant getting mixed with oil or vice versa?
Run engine to normal opeating temperature
Remove dipstick and let a drop fall onto a hot engine part
Oil will smoke coolant will sizzle
Do a compression test
2 adjacient cylinders with low readings indicate a leaking head gasket

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Posted on Jul 14, 2009

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