Leak is fixed, it was the O-rings.
What a tight. patience testing job.
on my 99 with a 2002? replacement engine I needed 2 X 999-707-409-40-M17 and 2 X 999-707-389-40-M17 O-rings. Buy new gaskets for the intake to head runners 997-110-247-00-M30 and I should have bought one for the throttle body to intake, also. I also bought a liter of Pentosin CHF 11 S and replaced the steering fluid I sucked out.
When the exchanger is popped loose from the block I don't see any way to avoid some water / oil contamination.
Plan on an oil change. If I did this again I drop the oil pan plan and check for water. Loctite 5900 to seal it according to our host.
I had to cheap out and reuse my coolant. Wonder of wonders! On the refill and start up I didn't have any purging problems.
Draft a helper with long skinny arms, some of the reaches are tight to say the least. The factory manual did not mention a fuel circuit on one of the A/C coolant pipes in the back of the compressor. Before you remove these hoses cogitate on how the heck you're going to re-connect them.
one of 2 fuel lines you have to reconnect!
I hope this is a repair that you never have to do with the eng. in :-)
Lance