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1999 / S 420 should be W140 model, is that correct?
You have to consider that Mercedes heating system is connected to the first circle of the car cooling system, this is one of the reason why they starting trowing heat very fast after the start of the car. If you driving very short distances the car doesn't have time to warm up.
What do you mean by: "air from the heater is not really hot"? Perhaps something is wrong with your temperature control unit?
Give a bit more info and someone could help.
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