Hopefully just a blockage or something else simple!
When stationery I get a build of of exhaust fumes in my 1990 16v. It has only recently started doing (well more noticable anyway - never used to bother me!).
It also only seems to appear if I've got the blowers on (hot or cold). Where does the air-intake for the blowers come from? Could I have inadvertanlty blocked them when pulling my amp power cable in thru the bulk head (passenger side footwell?)
As far as I can tell there is no leak on the exhaust - nothing is blowing anyway.
Any ideas - you don't want me falling asleep at the wheel and taking another Mk II golf off the roads now do you!!!

cheers all