Magnetic Clutch Compressor: Rhythmically Driven

Hi there,

'Yesterday, I noticed that the magnetic clutch of the air conditioning compressor engages for 2-3 seconds, then disengages for 5 seconds... and this happens even with a warm engine. What's going on again? It might be related to the engine removal and installation I recently did. I couldn't observe this behavior before. The error memory is clear except for a sporadically appearing fault code related to the control valve.'

I'm going to lose my mind.