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1997 GMC Yukon Question: What will be causing white smoke from tail pipe,and no coolant in radiator.

 

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montey, 5.7L V8, Joliet, IL, January 10, 2012, 18:30
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Last couple of days now, gage light will come on,water pressure running hot, but then will go back to normal,heater takes long to work.twice I had to add coolant.I checked for leaks,radiator,hoses, around engine,no leaks that i can see,no coolant on ground either.

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    PARTS GUY January 10, 2012, 20:22
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     Master

    You need to stop driving this truck or you will be replacing the engine. You have a leak in the cooling system. You need to find a repair shop to check for a leak. By now you need to have it checked for a blown headgasket.

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  • Answer #2

    patrick mannion from Greg Solow's Engine Room, January 10, 2012, 21:25
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     Master

    Agree with Parts Guy! Stop driving the truck, having the cooling system pressure tested for leaks, it may be allowing coolant into a cylinder due to a failed head gasket. There is a simple chemical test to look for the presence of carbon monoxide in the cooling system (which would only be present if the h/gasket was blown), the test is called a Block Test.

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