After my husband added coolant to my VW AC, that same night a rumbling vibration started (sounds like under the hood) - on/off on/off. It stays on when idle. (Manual transmission) Now the AC is coming on and off - cold, then barely cool - and with less power. Also, when I accelerate it falters, like I'm stepping on and off the gas pedal

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Compressor cycling is caused mostly by low Freon levels or over charged system. Likely possibility is it has been over charged. Recommend taking it to an A/C Certified shop and having the system evacuated, vacuumed and charged to the correct amount.

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