If you left vinegar, and other stuff, sitting in your loop for any length of time, it may be time to scrap the radiator.
The rest of the components should also be opened up checked for damage, and cleaned thoroughly.
Vinegar is acetic acid and water, and is mildly corrosive to most metals, including copper.
One of the byproducts of the reaction between acetic acid and copper is hydrogen gas,
If the loop was sealed at the time, the release of hydrogen gas in the closed loop may have created enough pressure to blow some of the mix past a seal, or out a pinhole leak in the radiator that isn't obvious without pressure.
Acetates, and other organic compounds, found in many products used in the construction of most homes and buildings, and the majority of the cleaning and air freshening products people use, are actually a huge "problem" in my industry.
They collect on and eat away at the copper tubing in evaporator coils in air conditioning equipment.
I ain't complaining though, as I make a living repairing, replacing and selling the stuff.
I smile whenever I see TV adds for air home air freshening products, cleaning products and scented candles, because I know what is in them, and what it does to air conditioning coils.Edited by Caleal - 1/11/12 at 7:31pm