The oil cooler is welded to the bottom of the CAC. If you are going to replace the oil cooler, and you still have the original CAC, I would do a leakdown test on the CAC. In my 1999 Alpine, the CAC seals were leaking very badly. I ended up replacing the CAC with a new unit form Duralite. In my case, the oil cooler was still good, so I cut the oil cooler off the original CAC and had it TIG welded to the new CAC. You probably don't want to go to all the trouble of replacing the oil cooler, and then later finding out the CAC is bad and have to do the job all over again.
1999 Alpine Coach