Further 300SE A/C Troubleshooting

admin — Tue, 02 May 2017 23:46:42 +0000

Previously, I had identified that the cause of my A/C problems was the fuse blowing. I have been narrowing down the problem more and more to the compressor clutch. Therefore, I wanted to eliminate everything else as the compressor is every expensive and beyond my skillset. I had already unplugged two other components that are part of the fuse 5 wiring: The monovalve and the Aux water pump. The other component that is part of this circuit is the aspirator fan. This fan is a very small fan that draws air over the temperature sensor for the climate control. I was hearing a lot of noise from the area of the car where this fan is located.

This fan is located behind the glove box, so I removed the glove box and the kick panel below it. However, to my surprise the fan was missing! The connector for it was there, but no aspirator fan. Since I have already bought a new one, I will try and re-fit it. Even though the noise I was getting did not vary with the blower speed, it appears it is from the blower. Since the blower is on another fuse, I will worry about it later.

The next thing I did was replace the missing relay that is for the Aux fan. I am not even sure how relevant this is as the Aux fan wiring has been messed with at some point. Relays are cheap and so I replaced it anyway.

The car is now looking rather stripped down, with no radio, missing console panels, glove box, kick panel etc. It will probably be like this for a while as I am not any closer to solving the problem. At least my car will have an aspirator fan.

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Further 300SE A/C Troubleshooting