1998 Volvo S90

Engine Cooling problem
1998 Volvo S90 6 cyl Two Wheel Drive Automatic 177000 miles

I wanted to know about the white smoke that is blowing out of the exhaust pipe. I checked the spark plugs and there is no leaking in those, it is bone dry and there is no leaking under the car, so I was thinking if it was just the gasket in between the header and the exhaust. What do you think? I also checked the oil and didnt see ony signs of water floating in the oil either.
December 1, 2009.

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