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Mike, Mercedes Technician
Category: Mercedes
Satisfied Customers: 39198
Experience:  Tech Expert
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Hi The heater fan will not stop running. the control knob

Customer Question

The heater fan will not stop running. the control knob has no effect or when I take the key out of the ignition.

I have to disconnect the battery to stop the fan.

Submitted: 5 years ago.
Category: Mercedes
Expert:  Mike replied 5 years ago.
Hello and Welcome to justanswer...

My name is MIKE.. Im happy to help you with this..

You are going to need to check at the heater -and the switch control panel for voltage / current checks - to see if first you have a failed / faulty switch - or , a short in the wiring / fault circuit.

I dont know what tech capabilities / equipment you have, its quite a task - but that is what is going to be needed here - it has to be physically traced down as above so that this can be fixed for you. Let me know how you get on - that is what is going to be needed on this one -

Let me know if you need anything else on this -

Meantime -- Please click on the OK rating to Excellent ratings service for me now, Thank you for that... and you can get back to me any time if you need / wish..

Best Rgds, MIKE.

Please note, you are rating the content of my "answer" - my help to you - not the "system" which can experience delays etc which are not under my personal control -or delays caused by "time -off" which we all have on occasion - Thank you.