Yes, last year!!! 2001 Imperial with side radiator and 70,000 miles. Cost ~$6000. Was copper and replaced with another copper core. It had just slowly crumbled away and ran hot under load. New one is great and doesn't move the temp gauge in 100 degree weather ( on the flats). Can just barely detect an increase if loaded down. Sure beats the trip I made to Montana and back driving by the temp gauge instead of the speedometer!
Good luck and safe travels!
Doug & Connie
2001 Holiday Rambler Imperial 41ft PBD 370hp ISL AF1 braking system
2001 Subaru Forester manual toad