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Discussion Starter · #1 ·
Hi im from Sydney Australia and i recently bought a 2004 r171 slk 200 and the fan stays on at fullspeed when car is on and when u turn the ignition on and off its first thing on and off. I brang it to a meachanic said it was the thermostat so he replaced it and was fine. I drove the car today same issue as before. Would anyone have a clue what is ??
 

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Lui90,

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I have eight Mercs including four W163 type MLs so have a bit of experience. On the ML if the air conditioning refrigerant is low in pressure the electric cooling fan will switch on and stay on, irrespective of whether the air conditioning is on or off. Its just the way the circuit logic works.

Which raises the question of whether your air conditioning refrigerant in your SLK is low in pressure. How well is your air conditioning working?
 

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Discussion Starter · #6 ·
When I got the car the aircon wasn't working and I got it re gassed the mechanic Said that there was no leaks he apparently done a dye test

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When I got the car the aircon wasn't working and I got it re gassed the mechanic Said that there was no leaks he apparently done a dye test.
Doesn't quite answer the question. What you are saying is that air conditioning wasn't working recently (possibly a refrigerant leak) and it was regassed.

So is it working perfectly now - yes or no - because if it has leaked again then this could be the cause of your fan staying on. Go and test your air conditioning thoroughly.
 

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Discussion Starter · #8 ·
When I got the car back from the mechanic was working perfectly I will have to check it again and go through it.

Also what should the temperature be at when I'm driving I'm worried to drive the car with it running so fast

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I have eight Mercs including four W163 type MLs so have a bit of experience. On the ML if the air conditioning refrigerant is low in pressure the electric cooling fan will switch on and stay on, irrespective of whether the air conditioning is on or off. Its just the way the circuit logic works.

Which raises the question of whether your air conditioning refrigerant in your SLK is low in pressure. How well is your air conditioning working?
My wife c class had a engine rebuild and they disconnect the ac compressor so there is no pressure ( confirmed by das/star machine ) but my fan in not on, regardless of ac on/off.
 

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My wife c class had a engine rebuild and they disconnect the ac compressor so there is no pressure ( confirmed by das/star machine ) but my fan in not on, regardless of ac on/off.
Refrigerant low in pressure is not the same as an electrically disconnected compressor. In the ML, when the system detects low pressure, the fan comes on and stays on. If one disconnected the compressor electrically (and there is refrigerant) there is still pressure which is likely above a threshold pressure which triggers the fan.

The OP needs to check is A/C.
 
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