My guess would be you are low on refrigerant but I would confirm this with a set of gauges hooked up to the low and high side taps. The #7 pressure reading of 9 bar is too low but that pressure is not taken at the same point as the tap it located. You should have low pressure in the 25-30 PSI range and high side in the 200-250ish range. You really can't be sure of what's going on until you check the pressures. Either buy a set of gauges or bring it to a professional.

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Marty D.

2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz