It is best to purchase the correct tools when working on an A/C system. This includes a vent thermometer and R134 or R12 manifold guages (depending on the year of your car) to verify the hi/low side pressures.

On the 1995 model, the w124 was equipped with R134a refridgerant. Gauges are relatively cheap starting around $40 or $50 for a cheap set.

Good luck!

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Daily Driver: 02 E430 4MATIC
In the family: '03 E500 // '04 ML500 // 64 220SE