Hey everyone,

While my 300SD is being repaired at the body shop, I spoke to the guy over there and he said he could wire the auxillary fan to come on automatically whenever the A/C compressor starts, but he wants me to get instructions for him on how to do it in that particular system. So, I need two things.

Firstly, I need to get the instructions on how to do so from someone who has done it or simply knows how to do it so I can hand them to him.

Secondly, there is a tiny, screw on type sensor on the receiver-dryer that broke off during the accident. Is that the sensor that senses how much pressure has built up and then kicks on the auxillary fan? If so, do I still need to replace it even after we do the wiring? Thanks all once again for you help.

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1999 Mercedes-Benz S600, 103K miles - garage queen
1988 Mercedes-Benz 560SEL, 89K miles - daily driver
2007 Hyundai Sonata Limited, 31K - daily driver