If the fan is not blowing, then your problem is 99% the blower motor regulator. It's a common issue on the W210 and new regulators can be bought for about $80-90 for the the Behr brand. Cheaper can also be found, but they do not last.

Once you replace the regulator, the fan will work well again. Now that you've evacuated the a/c system. You'll need to pull a vacuum before charging the system. If you don't have a vacuum pump, take it to any mechanic shop that offers an a/c service. This is basically a vac and charge.

They usually charge about $30 for the vacuum plus the cost of the freon, which they can add by weight, so it will be the exact amount that your car needs.

Good luck.

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With best regards

Al