Q: How much AC Flush is required for a vehicle flush?

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I've purchased my own parts for a mechanic to replace my compressor, condenser, and ac flush. I would like to know how much AC Flush I would need to buy and what kind or brand could I purchase from Autozone or O'Reilly. Any help would be appreciated.

My car has 125000 miles.
My car has an automatic transmission.

You should not need more than 1 quart of flush. The brand does not matter. They are all made from the same chemicals.

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