Question about 2004 Mercedes-Benz Mercedes Benz M Class
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?
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
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
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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