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

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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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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