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Old 01-31-2018, 06:56 PM
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Join Date: Mar 2008
Location: cranford, nj
Posts: 141
W124 300D no power at climate switches

How's it going all, been a while. Car has been running fine, but an issue has come up I never dealt with before.
At first the heat would not come on till the motor warmed up. I didn't try the defroster, so I don't know if it was working. The blower would come on later and later, and now does not come on at all. The fuse is fine, so where would be the next place to look? Do these 124's have a thermostat that would control the power to the blower? Any ideas before I pull the dash apart? Thanks

1990 300D 2.5
1991 F350 7.3 Dually IDI

1997 F350 gasser dump
1980 H-D 93 inch Shovel
2000 SE Roadglide
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Old 01-31-2018, 10:44 PM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,793
There’s a yellow signal wire to the blower controller at a junction above the brake booster. Set the ACC to defrost and check voltage at the yellow wire. Check voltage at the bigger wires as well. One should be constant 12V the other is ground. The yellow wire sends 0-7V or something like that to the blower controller under the blower. It should register 7V or so on defrost.

98 E320s sedan and wagon

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