PeachParts Mercedes-Benz Forum - View Single Post

LUVMBDiesels · #8 04-09-2008, 08:04 AM

Try a citric acid flush. Do a search for citric acid flush and follow the directions.

I would also think about replacing the radiator as it is over twenty years old and is probably clogged. You can get a replacement Behr from radiators.com for about $200.00 When I did the flush, it loosened up the clog that had blocked a hole in the rad... Replacing it is at most a 1/2 hour job.

It made a big difference in the 300SD took the temps from 100+ to 85

Make sure that you fill the system with Zerex G-05 and only to a 50% ratio. Any more antifreeze and the temps will go up due to the Zerex's lower ability to transfer heat.

Make sure that you 'burp' the system as well... park on an incline with the radiator facing uphill, get it up to operating temperature, turn on the defroster and gun it up to 3000RPM a few times. that should get any air out of the system.

Good Luck!