1995 Mercedes Benz 300d auxillary fans

CAIRO

MEMBER
13 POSTS

Removing the 30A relay stops the fan. Removing the 15A relay does not affect the fan. I have not located where to unplug the A/C push button control. Can you help me locate it?

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Monday, April 20th, 2009 AT 5:28 PM

KHLOW2008

MECHANIC
41,814 POSTS

Removing 30A fuse means the auxiliary fans are working at high speed and the circuit should be controlled by the A/C compressor pressure switch. Test the Brown/Blue wire from relay to A/C pressure switch for shorting to ground. Unplug both relay and pressure switch to test.

Here are a description of the Push Button and auxiliary fans.