I turn my heater/AC on idle, vehicle experiences power loss and almost stalls

Good afternoon,

This sounds like you have low voltage from the battery. The charging system needs to be checked along with load testing the battery.

https://www.2carpros.com/articles/car-battery-load-test

Do you have a volt meter to test the voltage at the battery with the engine running?

https://www.2carpros.com/articles/how-to-check-a-car-alternator

Roy

REMOVAL PROCEDURE

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1. Disconnect the battery negative cable.
2. Remove the drive belt.
3. Disconnect the battery positive cable nut (1) on the generator.

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4. Remove the A/C line mounting bracket bolt at the engine life hook.

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5. Remove the right engine lift hook bolts and remove the lift hook.

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6. Remove the 3 generator mounting bolts and remove the generator.