1999 Volvo Wagon Blue smoke out exhaust

No, I don't believe that would cause it. As far as replacement, it is on the intake manifold and is held on with two bolts. Not that hard to replace.

If you are getting blue smoke, that sounds like you are burning oil. However, white smoke usually indicates coolant is getting into the combustion chamber and burning. The most common cause for the white smoke is coolant getting past a bad head gasket.