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At the recommendation of others on the BrickBoard, I'm changing over to Zerex GL-05 formula coolant/anti-freeze in my 945 turbo brick.
Upon removing and cleaning the expansion tank, I found some "sand" type material, somewhat dark in color at the bottom of the coolant reservoir tank . Is this metal from the water jackets or a substance in the previous Prestone conventional green coolant?
There was quite a bit of this sand in the tank, so a complete flushing of the system is in order obviously.
Anyone venture a reason for the sand material and what it is in my otherwise spotless cooling system?
John
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