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

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
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.
(2) Answers
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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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.