I have seen many in the habit of putting A/C off before putting off the engine. Also, people making sure the A/C is off before cranking the car.

I imaging that people are doing so to less the load on the kick starter and battery.

I invite professionals here to lecture us as to whether the A/C compressor is active during cranking? If it isnt, then putting A/C on or off does not matter.

I do hear a click before my car's compressor is active and an increase in idle rpm. I hear that click after i put on A/C, on intervals while idling and immediately after engine has successfully started with A/C on.

Since i hear that click after it has started, i feel the compressor wasnt active during engine cranking.

Hearing from professionals on this forum will expose our actions in this matter.

I usually ensure that not just the A/C, but all electrical/electronic accesories are turned off before starting or turning off the ignition of my car. I do this as a precautionary care in case anything may go wrong. I also do this in the house and office, when switching on/off the generator.

I don't know why & I don't know much, but, maybe its because of all the office opening and locking procedures over the years or maybe from the safety trainings I have received. The "SAFETY FIRST" thing, if you understand what I mean.

adanny01:
I have seen many in the habit of putting A/C off before putting off the engine. Also, people making sure the A/C is off before cranking the car.

I imaging that people are doing so to less the load on the kick starter and battery.

I invite professionals here to lecture us as to whether the A/C compressor is active during cranking? If it isnt, then putting A/C on or off does not matter.

I do hear a click before my car's compressor is active and an increase in idle rpm. I hear that click after i put on A/C, on intervals while idling and immediately after engine has successfully started with A/C on.

Since i hear that click after it has started, i feel the compressor wasnt active during engine cranking.

Hearing from professionals on this forum will expose our actions in this matter.

it doesnt matter as

remember when you switch of the car the AC switches off and when start the car again by default AC should be off this is controlled by a relay switch unless otherwise something is wrong

or may be the so called REWIRE messed up the wiring