ventalation fan problem on G500

[blau]

Just recently,I notice a problem with the ventilation fan system. At times when the fan in the ventilation is on when I try to suddenly increase the speed of the fan say from 3 to full or near full the ventilation fan would shut off completely. And at times the fan would turn back on in a few minutes and at times the fan would work again if I stop and restart the car.

It seem like I am overloading the fan when I increase speed of the fan.

Anyone have this happen to their G. any ideas what the problem could be.

thanks

[mbdoc]

Most likely a faulty electronic blower regulator.

Do you replace the "dust" microfilter every 15-20K miles?

[blau]

nope did not replace the micro filter. Unless it was done as part of the regular A & B service. It has less than 35 K on the G.

Questions:

Could the micro filter be causing the problem?? Some how I don't think this is the cause. I still have very good ventalation blowing when the fan is on. But what do I know?

Also you mention the electronic blower regulator is that something easy to access and check and replace?

thanks

[mbdoc]

Filter replacement is part of every "B" service. Should be done every 15-20K. More often in areas with sand & dusty conditions.

A plugged micro-filter will cause the blower motor to work harder & that causes the blower regulator to run hotter.

The regulator is somewhat simple to change. Takes a dealer tech less than 45 minutes to change. Under the passenger side under-dash panel.

[blau]

hello still trying to fix the vent problem. I though I read somewhere that someone had the same problem and they change the battery and the problem when away. I try searching for the thread but cannot find it.

My battery is marginal sometimes show 11.95-11.9 volts but will aways start. Could my vent fand problem be related to the battery??

thanks

[mbdoc]

Like I suggested before..... Most likely a faulty electronic blower regulator.

System is the same as a W203 C-class.

[blau]

Where and how do you get to the blower regulator? I have been able to drop the pannel below the glove box to expose the blower on the passenger side. Am I on the right track.

thanks

[mbdoc]

Yes, regulator is mounted to the blower motor.