1. De-ionized
2. Silicone 3/8
3. car cooling system conditioner stops bacteria and corrosion
4. None
5. window on side of case but no direct sunlight
6. 1 month
7. clear
8. Copper block base , brass barbs , copper chevvy heater core with brass barbs
9. no problems so far but have to check levels once a week. The cooling conditioner left a white residue on the tubes
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