Q: Car A/C Stops Working After Stressing Drive

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My car's A/C starts to not work on hot days after driving it for 1 hour in city traffic. Additionally, if I take a trip into the mountains my car's A/C will stop working after two hours of climbing to elevations or stressing the engine driving up inclines etc. The A/C will blow hot air until the car has cooled down (If I park the car for an hour or two). What do I need to do to fix this?

My car has 95000 miles.
My car has an automatic transmission.

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