1991 200E W124 air con fan failure

iron star

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Hello, i need your help!

On my Mercedes-Benz 200E the aux fan don't work with the air-con ON, but:

1) the pressure switch is OK
2) air-con works ok: the temperature of the condenser reaches "solar" values in few minutes (with the aux fan off)!

(note that the aux fan works fine with the air-con OFF, when the engine temperature is near 110°C)

What happened to my beloved car?

Thanks for your help
 

jibcl500

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lost its gas as a guess. Condensers probably holed.



jib
 

television

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Hello and welcome,, the electric aux fan comes on at 100c and goes off at 107c approx It can start up on it own after you have turned off
 
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iron star

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A few weeks ago, with air conditioned on the fan was also on, and now the fan only comes on when the engine (water) temperature reach approx 100°C

Now the fan does not work with air conditioned on, and the radiator air conditioning reaches very high temperatures

Sorry for my English unclear


thanks
 
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iron star

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Thank you! Malcom:

I'll explain what I know about this car:

1) The electric fan (named aux fan) works when the engine temperature is near 100 - 110°C

2) With the air conditioned activated the fan is controlled by the pressure switch placed on the circuit of the air conditioner, which keeps the fan on whenever the compressor comes on, regardless of the temperature of the engine

Now is this function that no longer exists and the temperature of the radiator conditioner greatly increases.

obviously the pressure switch is working well and this makes inexplicable the phenomenon

the thermo switch you mentioned works well, and activates the fan driven by the motor, with magnetic clutch, when the auxiliary fan works for the air conditioning and the engine temperature increase over 110°C

Giovanni
 

television

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Is the air con still working
 
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iron star

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Yes, air con still working, but logically without aux fan the condenser temperature rises rapidly!

I imagine that the pressure also rise


thanks Malcom!
 
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television

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With an email address I can send you a file on how it all works
 

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