The ideal timing for this proceedure would be when the coolant needs refreshing, because then I would not only drain the coolant, but take the time to remove the radiator for some additional work space and rad inspection.

My next post will be on changing the aux fans. I also did the same job on both my cars... busy weekend! My son was taking the 90E back to San Diego State so I wanted to make sure that all the work was done already. While at it, I changed the fluids and the belt.

Al

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03 CLK430 Cabrio 211K Pweter Silver/ Oyster Leather
90 300SEL 214k Pearl Black/ Alto Grey/Black Leather

Prior: 85 190E, 88 300TE, 89 300TE, 90 300E 2.6, 90 300TE, 92 300E 2.6, 91 and 93 300SL, 87 Ferrari Mondial Cabrio