Charge air cooler

[Waterloo]

I replaced my CAC at around 900,000 miles. It passed all of the tests with flying colors. I hosed it out, blew it out etc. Still having issues, so I replaced, not knowing 100% if that would solve the issues I was having with boost. Sure enough, that new OEM CAC fixed the problem. After time, I think they just lose their efficiency with dirt and pollen, etc. Maybe I am blowing smoke up my rear end, but replacing that 900,000 mile CAC did make a positive difference.