AC blowing hot air / turning it off and immediately back on fixes it

Sounds like a relay.

Disclosure: I have no idea what I'm talking about.

Reinstall your Windows.


;)

AC AIDS

Is the outside unit running before you turn it off, and back on? If not I wonder if you may have a failing capacitor, and turning it off, and on is somehow getting the capacitor work.

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Failing capacitor

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Does it look like this?

was having the same problem last night. coils were dirty, causing my fan to overheat and seize up. Had to replace fan.

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FenrirTheBeard

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i hope you are not posting from "work"

You don't say vehicle brand and type.

Most have a door in the ac/heater ductwork that opens and closes (along with other things like compressor coming on) to go from heating to cooling. It sounds like the door is sticking, or going out of sync (if you have driver and passenger split controls) or failing to properly cycle.

Try googling your vehicle and model year and some descriptive wording and see what others are saying. You will be surprised how many of these types of problems are common and already thoroughly discussed on the interwebs (Thank you AL Gore).

Oh some doors are vacuum controlled and failure may be due to vacuum leak.

See what google points you toward.

Check your Freon level, but it sounds like the coil that sits behind the compressor clutch is going out.