A/C blower not working
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Newbie
Joined: Jul 2018
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2004 S430
A/C blower not working
Last year my a/c blower intermittently would not engage when turned on. It would kick in after about 1-2 minutes. Well, it did the same thing several days go nd then yesterday it stopped working. Do I need to change a fuse or is there some sort of regulator? Please help, it’s 106 degrees in Dallas, TX.
MBWorld Fanatic!
Joined: Dec 2012
Posts: 2,474
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From: Ball Ground, GA (N of Atlanta)
2003 S500 2007 GL450
Check the fuse. The fuse diagram is originally on a small folded piece of paper on the tool holder in the center of the spare wheel. If not there, go to http://www.benzworld.org/forums/w220...tart-here.html and start scrolling down and looking for the fuse charts, then go to https://w220.ee/ and scroll down to WIS83 near the bottom and start learning.
A greatly over-simplified approach...
Pull the cover from the bottom of the dash just to the right of center, and expose the blower and the speed regulator in the center of the blower.Find the two heavy wires going to the center of the regulator, unplug them and remove the regulator. Hook the two heavy wires to the blower motor, and turn the HVAC on. If the blower runs at full speed, the problem is the regulator. If it doesn't work at all, use a test light to check for power on the two heavy wires. If there is power, the problem is the blower motor. If there is no power, the problem is likely to be the fuse or a connector.
A greatly over-simplified approach...
Pull the cover from the bottom of the dash just to the right of center, and expose the blower and the speed regulator in the center of the blower.Find the two heavy wires going to the center of the regulator, unplug them and remove the regulator. Hook the two heavy wires to the blower motor, and turn the HVAC on. If the blower runs at full speed, the problem is the regulator. If it doesn't work at all, use a test light to check for power on the two heavy wires. If there is power, the problem is the blower motor. If there is no power, the problem is likely to be the fuse or a connector.
