Question about 2004 Mercedes-Benz Mercedes Benz M Class

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MERCEDES ML270, WINDSCREEN BLOWER NOT WORKING.

ALL OF MY BLOWERS IN THE CAR WORK APART FROM THE WINDSCREEN BLOWER, THERE IS NO AIR COMING UP THROUGH THE VENT ON THE TOP OF THE DASHBOARD. I CAN USE THE DE-MISTER BUT THIS AUTOMATICALLY PUTS THE AIR CON ON. WHY DO ALL BLOWERS WORK APART FROM THAT ONE?

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  • Anonymous Dec 02, 2008

    I have an E-Class. The blowers come on for a few seconds but then just stop. Every now and then they come back on!

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3 Suggested Answers

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  • 94 Answers

SOURCE: audi a4 front de-mister problem

ONE OF THE HEATER DISTRIBUTION FLAP MOTORS DEFECTIVE. UNSCREW GLOVEBOX AND YOU WILL SEE THE MOTORS.TEST WITH THE BLOWERS ON ,TRY EACH VENT TO FIND FAULTY MOTOR...

Posted on Feb 18, 2009

  • 10 Answers

SOURCE: 1989 mercedes 190e blower motor and vents not working properly

Probably two separate problems.
For the blower motor, it may be that the bearings are getting old and so the motor is getting harder to turn and overheating. A way to check is to take the motor out (it will be tucked in behind the glovebox. Pour a tablespoon of motor oil into the vents next to the shaft and work it back and forth to loosen it up. Then put the motor back in and try it. If I'm right, the motor will work normally again. However, this is only temporary--once the oil gets worn off the bearings in a while it will start quitting again. You should order a replacement before it blows your resistor block or (in the worst case) starts a fire. You can get them online, like from autopartswarehouse.com

Posted on Feb 27, 2010

  • 1608 Answers

SOURCE: Blower air just through defroster vents, not front vents

The problem is that the plastic lines that the air flows through get frail and cracks and breaks.What happens is when the hose breaks you loose vacuum and the system reverts to defrost mode.You should be able to see it from under the hood on the passengers side.You will have to find the area that is broken and then go to the parts store and get some rubber hose that will fit over the plastic hose.Take a piece of the plastic hose with you so you can get the right size hose to fit over it.This just happened to my 97 Astro van.I found the broken hose and repaired it with the rubber line and is working normal now.Hope this helps.Let me know what you find out.Good luck.

Posted on Jul 20, 2010

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The problem is that the plastic lines that the air flows through get frail and cracks and breaks.What happens is when the hose breaks you loose vacuum and the system reverts to defrost mode.You should be able to see it from under the hood on the passengers side.You will have to find the area that is broken and then go to the parts store and get some rubber hose that will fit over the plastic hose.Take a piece of the plastic hose with you so you can get the right size hose to fit over it.This just happened to my 97 Astro van.I found the broken hose and repaired it with the rubber line and is working normal now.Hope this helps.Let me know what you find out.Good luck.

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1 Answer

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Hi

Thanks for using FixYa. The possible causes due to which the blower is not working normally are fuse, blower resistor or a bad blower motor. Test the voltage at the blower with a test light. Please check the motor relay switch fuse under the dashboard. Use a multi meter to measure ohms for continuity. If these are fine, bypass the blower motor relay switch to make sure blower motor is running fine. Motor relay switch is right next to radiator fan relay switch under the hood. Pull out the blower motor relay switch to see 4 female pin holes. Test the relay switch using a 12 volts power source and a multi meter to measure continuity. If fan works after jumping the pin holes, then blower motor is fine but relay switch may be faulty. You may also need to replace the blower motor resistor. If still the problem persists, then you need to replace the blower motor.

Please do rate the solution and revert for further assistance.


Thanks
Rylee

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1 Answer

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