It is not your nut that is leaking but the head gasket. No pressure should
be coming up through the head bolt holes.

Entity Walter E Stephens spoke thus:

I have just replaced the head on 90 Vanagon with a 2.1L engine.  I have a
leaky cylinder head nut.  I have tried 3 different sealants and nothing
stops the coolant from leaking past the nut.  I can not see a visable crack,
but the coolant just flows as if the nut were not there.

Has anyone else had a similar experience, or suggestion to make?  I hate to
have to remove the head again.

Walter E. Stephens
ACS - AeroCrafters Supply
POB 455
Langley, WA  98260
(360) 221-5039
www.acs-aerocrafters.com <http://www.acs-aerocrafters.com>