e320 blower troubleshooting - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 02-19-2012, 07:20 AM Thread Starter
BenzWorld Newbie
Date registered: May 2007
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e320 blower troubleshooting

I have a 2002 E320 and a blower motor problem that is driving me crazy.

Started with intermittent blower operation. Finally no blower operation.

Then, after taking the covers down and driving it for a week or so, the motor came on full speed, and couldn't be adjusted. It kept running after the car was turned off, and I had to disconnect the ground wire going to the regulator to stop it.

Ok...regulator problem, right? Bought a new one, and it still didn't work.

Bought a new motor, because the motor would not run out of the car when I applied 12 v direct to the motor.

Still doesn't work with new regulator and motor.

I even tried swapping out the control unit, no improvement. Fuses all check out ok.

I have 12+ volts at the connections at the blower.

Are there any diagnostics I can perform to see what is going on? Is there a relay somewhere that could be causing this problem.

Thanks for any, and I mean ANY, help you can provide.
Ron Bruno is offline  
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