Color of Antifreeze
Red, you are correct that these testers only tell you the approximate ratio of gycol to water. That determines the freezing point and boiling point of the coolant. Whether the necessary corrosion inhibitors are present would require a lot more chemical analysis. Manufacturers predict about how fast those degrade and then recommend a service cycle which replaces them in time. Hence the 3 year change out.
With the W211, MB changed the cycle from 3 years to 15 years using the same antifreeze fluid. Seems like something must have changed in the cooling system. If not, maybe we (W210) can go longer as well.
Last edited by RichardM98; Feb 11, 2010 at 05:53 PM.
MBTech....as long as it passes what?
The Best of Mercedes & AMG
As far as testing; hydrometer test-tells the freezing point, and the test strips, which can give you a pH reading.
- Coolant
- Engine Oil
- Trans Fluid.
I had to drain the Window Washer reservoir because there was rubber deteriorated inside. When I picked some out it felt like jello and disintegrated in the fingers. I took the reservoir out of the car, scrubbed it out, and reinstalled it. Needs new washer fluid also now. Is any washer fluid acceptable, or is there a recommendation for that too. Thanks.
Cant wait to start motoring!!



But seriously, yours is a good idea. I would appreciate it if you would mention which coolant tester you are using. I know we can buy dipsticks and compare color change to a chart, but what do you use please?
