W639 Viano Heater / Blower Problems Again - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 12-27-2012, 08:13 AM Thread Starter
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Date registered: Sep 2012
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Post W639 Viano Heater / Blower Problems Again

Hi there,

Looking for some advice.

The front heater on our 2004 W639 has stopped working. The wife was driving at the time and said it the fan started making a pulsing noise and then packed up all together. I did hear something similar the last time I used it but assumed a leaf or something had got through the filter. Rear heater working fine as are all fuses.

Anyway took the top cubby out of the dash and opened up the top cover of the blower to have a look, and although a bit dusty there was nothing blocking it. I checked the white connection to the motor on the voltmeter and there is about 4.5v with the ignition on and 12/13v when I turn the blower on so that looks OK.

So I'm thinking the blower motor has gone, but then I read that people have problems with the resistor, however I would have thought the voltage to the motor would be zero if the resistor was faulty.

Question is do I replace the blower motor, the resistor or both?

Second question is are there different blower motors depending upon whether you have A/C or not? I've seen a few pictures for blowers without A/C and they look the same as what I have, but I've got no idea.

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post #2 of 2 (permalink) Old 12-27-2012, 01:37 PM
Date registered: Jul 2005
Vehicle: 90 300E, 99 ML430, 00 ML320, 05 E500 4matic Wagon
Location: WI
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Based on the constant 12v at the blower motor I would replace the blower motor.

Take it out and bench test it with 12v first before purchasing a new one. That way you will know for sure if it is the motor. If it starts spinning then it may be the resistor.
Just went through this on the W211. The damn resistor is more than the blower on the W211s.
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