AC/Heater Blower not working. - Mercedes-Benz Forum

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Old 10-19-2010, 06:05 PM   #1 (permalink)
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Date registered: Oct 2010
Vehicle: 1998 E430, 2002 SL500
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AC/Heater Blower not working.

Well, I've got my first problem. The blower motor stopped working on my 98 E430. All of the inside controls work fine. I can hear the AC compressor kick in. The fan display goes from off to max, just no air coming out. I checked fuses 4 and 7 under the hood, OK. I did not hear any unusual sounds before it stopped. It actually worked fine when I stopped the car, just did not work when I started it again. Any suggestions or tips would really be appreciated. Thanks
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Old 10-19-2010, 09:13 PM   #2 (permalink)
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Very common problem. I have had this fail on my 97 an 98 E320.

Step1 - Take out blower motor under bottom dash on passenger side. Note that the electrical connectors lead to the blower regulator screwed onto the top of blower motor (this is probably what failed). Unplug wires between regulator and blower and connect a 12volt dc to the motor terminals to rule out if the blower motor and its bushings are not shot (!!!Before putting 12 volts to motor KEEP HANDS AND OBJECTS AWAY FROM BLOWER BLADES, FAN WILL ROTATE AT FULL POWER IF MOTOR IS GOOD!!!). If motor does not turn after appling 12v dc you may need to replace motor. If motor spins, go to step two.

I have had to replace motor on one of my cars and it was very difficult to find cheap replacement since a revised part has been issued for the blower and regulator. As I recall I did find new one for another model for around $40 and had to disassemble and install to fit into my 1997 motor housing.

Step 2 - Replace blower regulator (This is usually the main cause of failure). Remove and clean off old heat sink paste, then apply thin even layer of new heat sink paste to bottom of new part then put everyting back together. These can be found on ebay cheap see link below.

Mercedes W210 BLOWER MOTOR REGULATOR E300 E320 E400 NEW: eBay Motors (item 220682028183 end time Nov-11-10 02:06:43 PST)
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Old 10-19-2010, 09:15 PM   #3 (permalink)
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My best guess is that your fan blower regulator is to blame. There have been numerous threads discussing this. Try a search for regulator and you can read all day. Good luck.
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Old 10-19-2010, 09:21 PM   #4 (permalink)
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Thanks! Will work on it Saturday

Last edited by vincent52100; 10-19-2010 at 09:27 PM.
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Old 10-19-2010, 09:27 PM   #5 (permalink)
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Another question. We are going out of town tomorrow for a couple of days. If the motor is good does it hurt to run it at 12 volts constantly? Thanks
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Old 10-20-2010, 07:24 AM   #6 (permalink)
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FIXED!!

I must be living right! Followed the directions to remove blower, piece of cake. I didn't actually have to remove it, the problem was that the blue wire had come loose. I went ahead and took it out, cleaned it up, tightened the connection, re-installed, Back in Buisness!
Thanks for the great info!
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Old 10-20-2010, 04:40 PM   #7 (permalink)
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That is good news. I hadn't heard of that coming loose before. Something to watch for.

As for running full voltage all of the time, I would avoid that. It will put a lot of additional wear on the expensive motor. Good thing that you needn't resort to such things.
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Old 10-21-2010, 09:43 PM   #8 (permalink)
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Thanks. Yeah, I got real lucky! It was the connector where the spade terminal on the blue wire goes into the motor. I just crimped the female portion slightly with a pair of pliers and made sure it was tight when I connectewd it.
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Old 02-01-2012, 08:34 AM   #9 (permalink)
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Do I need the heat sync paste and where should I put it

Hey, Thanks to all these posts I decided to change the Blower regulator myself - which I did and have already installed it. WORKS GREAT!

I didnt add any heat paste anywhere even though I bought some.

Should I go back and apply it?

Just wasnt sure where on the regulator it was supposed to be spread.

Thanks for any help. Dont want to blow anything up or break the thing

Cheers,

Ben
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