C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Old Feb 20, 2015, 05:56 PM
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Old Aug 17, 2009 | 09:45 PM
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white vinegar will clean it.
you do have the heater running right?
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Old Aug 18, 2009 | 12:04 AM
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You left out an important part, and that is to neutralize the acid when finished.

Clr contains mild organic acids, vinegar is also an acid, as is oxalic acid, but they need to be neutralized.

Typically, if the radiator/heater core springs a leak, with the proper GM proceedure, then they were on their last legs anyway.
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