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Originally Posted by jaydee116
The problem is your radiator not the block IMO. If it is all aluminum then it is NOT protected/anodized on the inside of it. That is causing a problem with the base of the block being it is copper. Clean the system very well and then run 50/50 antifreeze and water. WalMart and other places sell 50/50 premixed. That is what I have been using lately.
This is NOT common though. The Aluminum radiator is bad to mix with a copper based block. My guess is the antifreeze mix was not strong enough. :shrug: Good luck. Good post!
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If the radiator was the problem, why would the top be corroding? I'm betting it's just galvanic corrosion between the copper base and the aluminum top. With the pieces that close together, even a tiny pinhole in the top's coating would definitely lead to extensive corrosion. The corrosion in areas away from the o-rings was probably also assisted by erosion.
The radiator may also be corroded if it's aluminum, but I doubt it will be nearly as bad as the top. For galvanic corrosion to occur, there needs to be electrical contact between the parts (aside from the water). The case may be providing this, depending on how the block is mounted to the CPU, but then there is the fact that the block and radiator are separated by a substantial distance compared to the block and the top.