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Check to see if the electric cooling fans are coming on, and at the proper temperature.

The air conditioning is adding heat to the engine, and your cooling system cannot remove the extra heat. This happens with some cars at idle, when the heat stays around the engine and the coolant is not circulating as quickly. Extra electric fans are installed to deal with this, but they have to be operating properly and you have to have the proper mix of antifreeze as well.

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Q: Why does your coolant boil when run the engine and AC together?
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