Question about GMC Sierra 1500

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Late 1999 4.8 Liter V8 GMC Sierra Seem to be losing small amount of coolant. No visible leaks, no power loss, engine is smooth and runs excellent. No water in oil, no oil in water, no overheat (runs around 190 degrees according to in dash gauge ). Heater will not get hot, barely warm. Replaced blend door actuator, no difference.

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ID BE LOOKING AT THE HEATER CORE FOR LEAKING. YOU MIGHT PRESSURE TEST IT FOR AN HR. YOU WILL MOST LIKELY FIND THE LEAK.:)

Posted on Dec 31, 2010

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2 Answers

I have a coolant leak


The first thing you need to check is for visible leaks, once you turn your vehicle on, there have to be some kind of leaks, pay attention since if the leak drop on top of the manifold, it will evaporate and you won't notice it.
Another thing to look for is excessive heat, with the vehicle on, put yourself in front of the vehicle, if you feel an excessive amount of heat, then probably the head gasket needs replacing, and it evaporate the coolant.
So as you can see, if there are no visible leaks, it is probably a problem from the inside of the engine.

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I have a 1999 gmc sonoma 2.2 liter truck I have coolant leaking around and out of transmission ..any help would be appreciated


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1 Answer

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You will need to figure out if it is fuel or ignition related.
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Jun 29, 2012 | 1997 GMC Sierra

1 Answer

Engine runs smooth and the head gasket has been replaced,I already know I need a new radiator..There is a small amount of white smoke at start up,and my oil is milky looking>


milky sump oil is coolant in the sump
could be head gasket
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1 Answer

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Hello Admin
The location of the thermostat is on the right front side of the engine about half way down on the end of the radiator hose.
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1 Answer

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1 Answer

Where is the oil level sensor located? oil guage wiggles between 40 & 60 at idle and stays on 60 on the road.


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1 Answer

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Check the oil, and make sure it is not turning a milky brown color. If it is, then you probably have a leaking head gasket/cracked head/cracked engine block. I normally wouldn't recommend this, but put some stop leak in it since the leak is not severe. Hopefully it will take care of it.
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Chris

Mar 26, 2009 | 2003 GMC Sierra

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