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The Anti-RUB
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White smoke coming out of the exhaust usually means coolant is getting into one or more of the cylinders somewhere/somehow, converted to steam and shot out the exhaust. This can happen many different ways. It could be as simple/cheap as a blown head gasket, or it could be as expensive as a cracked engine block or head. Warm the truck to normal op temps, top off the coolant, and drive around for a while. When done, check the coolant level. Did it go down? If so, then the white smoke is definitely the coolant getting into the cylider(s).

It is easy to check if you have an air compressor. Remove one of the rear spark plugs and the radiator cap (make sure the engine is COLD!!!). Fill the radiator and then push some air into the spark plug hole (get a good seal in case a valve is open). Repeat with all the cylinders and watch for air bubbles coming up into the radiator. If bubbles come up or fluid is pumped out, the head gasket is blown and must be replaced. It is more likely to happen at the back of the engine because it is farthest away from the fan and therefore gets less cooling.

Good luck...
 
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