A/C compressor Kicks on and off about every six seconds

A short cycling compressor is normally caused by a pressure issue or a perceived pressure issue. So we need to start with finding out what the pressure is when the engine is off. Then what the pressure is when the compressor is cycling on and off.

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

If you just want to get a video of the gauges then we can figure out what direction to go.

If you don't have a gauge set, then you can rent them at most parts stores. However, I would suggest not relaying on what the dealer found with this as if they cannot find the issue, retracing their steps may lead us to the same non solution.

So I would suggest we start from the beginning and go in the direction that the pressure takes us.

A/C systems are not that complicated so while I am sure they tried to figure the issue out, I am not surprised when some dealers can't find the issue as they normally jump past a basic item or miss a signal that should have taken them in a different direction.

Along with the video of the gauges, can you tell us what parts they have replaced? Let's start with this and go from there.

Thanks