Auxiliary fan does not engage

1996 MERCEDES BENZ E230
100,000 MILES • AUTOMATIC
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MOHAMAD JAMARUL RASOL
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Normally the Auxiliary fan will engage when the A/C turns on. Suddenly, the A/C not cooling, then I found that the fan is not running. I did a bypass test on the fan seems it is working.
Nov 29, 2020 at 2:29 AM
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KASEKENNY
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Can you give a little detail on how you bypassed the system to get the fan to come on? Did you just jump power to the fan or did you bypass a switch?

I suspect you have a sensor issue which is causing the ECM to not turn the fan on. Let's get this info and go from there because if you jumped a sensor like the pressure sensor, then that is your issue.

https://www.2carpros.com/articles/how-an-electric-cooling-fan-works

Let us know this info and we can go from there. Thanks
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Dec 1, 2020 at 12:58 PM