R107 560sl coolant flush - Mercedes-Benz Forum
 
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post #1 of 4 (permalink) Old 08-02-2019, 12:15 AM Thread Starter
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R107 560sl coolant flush

Trying to change the coolant for the first time on my r107. I saw green coolant the previous owner put in and looking to change it to the blue Mercedes antifreeze. My coolent level on the reservoir is low which coolant flush should I get.
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post #2 of 4 (permalink) Old 08-02-2019, 06:09 AM
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Ravi,

The service manual recommends a mild detergent (degreaser) flush followed by a citric acid (again mild solution) flush.

I drained my cooling system first; radiator and block drains. My block drains were clogged with sludge. Then I ran water through it with the engine (water pump) running and only the radiator plug removed. I used a 'T' fitting at the heater inlet hose. I did this until I saw clear water coming out of the radiator. Next, I did the degreaser solution - this step is to prep for the citric acid. Finally, I ran the citric acid flush. I could not believe how much silty green gunk came out.

In the end, I chose the MB blue coolant mixed with distilled water.
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post #3 of 4 (permalink) Old 08-08-2019, 05:17 AM Thread Starter
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Can you name a detergent I can use ?
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post #4 of 4 (permalink) Old 08-08-2019, 06:27 AM
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There is a lot of flex on the detergent. You do not want to use anything which foams. Do not use washing machine soap. Some have used dishwasher soap. At one time, Mercedes suggested this Shout product. About half the bottle is good.

Also-- the recommendation is for 500g of Citric acid, Disolve in warm water then pour in-- You can use any citric acid. Amazon has these for a low price. Food grade is fine.
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