White smoke coming from the exhaust could indicate that a head gasket has blown or there is a cracked cylinder head. Our technicians tell us that removal and inspection of the cylinder heads will be required to confirm a crack is present.Google+
Car Problem Reports
Mercury Cougar Blown/Cracked Head Gasket Can Cause White Smoke From Exhaust
Mercury Cougar Problem
Engine Affected: 3.8L V6
Average Mileage: 98,971 mi (34,500 mi - 150,000 mi)
Visitor, 1993 Mercury Cougar, 3.8L V6, 150,000 mi
water going right though it out the exhaust, put stop leak but it still losing water
Temp getting hot,and then cooling off.White smoke coming from exhaust.Used block sealer from part's store.Seem's to be working so far.
I had hydrocarbons in radiator overflow, plus white smoke coming from tailpipe,it was over heating and loosing coolant.I used blue devil block seal on it two years ago and it took care of it ever since.
started it up to leave for work it was running rough so i give it a little and it started blowing smoke out of the tail pipe no warning at all the head gaskets was going to give out