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Depends on what kind of water was used to cut the antifreeze mix. The deposits are likely mineral residue.
I used Zerex in my radiator for a long time and found that it corroded the aluminum fitting and left deposits in the hoses.
As a personal preference I now use Volvo compound mixed 50/50. I cleaned out (flushed) the system and left distilled water in the engine for a day or so. I drained and refilled with the Volvo antifreeze. I feel better knowing that the system is protected as it should be.
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89-740 GLE_91-940 Sedan _98-V90 Wagon_2001Mazda626
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