87 300D Blower Problem - PeachParts Mercedes-Benz Forum

Jmana · #1 07-17-2006, 07:27 PM

The forcast is calling for near 100 degree weather all week, so what more of a perfect week for my blower to stop blowing?!! Ever since buying the car, the blower has not been consistent, it would mostly blow slow, with the occasional burst of fast air, which didn't seem related to the speed of the car or the speed of the engine. So today it just quit altogether, with an occasional whisper of air that blows out just to tease me

Does this mean the blower is shot, or does it mean something else? I was ready to dig into the blower, but then remembered all the things that I have wasted my time trying to fix on this car, which had non obvious causes to the problem.

Jmana · #2 07-17-2006, 09:49 PM

I have one more thing to add that may help with diagnosing this problem. When I first turn the fan on, it will work for a couple of seconds then slowly die. Does this sound like a bad blower, or resistor, or something else? Please HELP!! It's hot out!

dieselmania · #3 07-17-2006, 10:35 PM

Actually the blower is easy to remove, it is located in front of the windshield, you remove it from outside. Why don't you open it up and run a hot wire to it to check it? Also, you might have a poor grounding connection. You could try running a ground wire to the metal part of the case to check that. When mine went, first it moaned a lot for about a year. I finally yanked it and replaced it with a new one, was close to $300 I think.

lrg · #4 07-18-2006, 02:09 AM

As dieselmania said try to "hotwire" it first to see if that's the problem. If it's still acting up before you replace it try partially dismantling the blower housing and try to coat the bearings with some oil. I wouldn't spray in WD40 unless you want to smell it for about a month. I used a short length of acquarium hose connected to a can of 3in1 oil and squirted it into the bearings at each end of the shaft by the motor. It helps to spin the blower a bit as you oil it. This rescued my blower, at least for now (about 18 months and counting).

Jmana · #5 07-18-2006, 06:58 AM

If the resistor goes bad, would it cause the same symptoms? Where is the resistor anyway? Is it possible to completely bypass it?

Jmana · #6 07-18-2006, 06:14 PM

Is it possible to run a "hot wire" to the blower without taking everything apart? I see a bunch of wires coming from the area where the blower is supposed to be, but not sure if they go straight to the blower, or which ones do so.