2004 E320 Blower and Regulator - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 07-11-2012, 09:42 AM Thread Starter
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Vehicle: 2004 S430 4Matic & 2001 SLK320
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2004 S430 Blower and Regulator

Hi everyone,

My blower works intermittently, sometimes when I start the car it won't blow, it just won't come on. Other times it starts with the car just fine. It never stops (unless I turn it off) once it starts, it only fails somehow once the engine has been turned off.

I just got a incredibly high estimate to replace the blower motor on the AC and power regulator/resistor. They want $1,400 for this, which is currently out of our price range. I have found online the part much cheaper than they quoted me, they had about $1000 in parts and $400 in labor. I can get the parts for about $400.

I doubt I need the blower motor as it does not whine or grind. I guess there could be bad brushes, but I doubt it. It sounds like the regulator. I have read elsewhere that the blower and regulator are located in the passenger wheel well. Once I get the trim off, I cannot seem to find what to take off next. There are some odd spacer type of plastic things I can get off (but are difficult to get back on), other than that I cannot see what to remove next.

Does anyone have a detailed explanation of how I get to the blower and regulator on a 04 E320? Or even better, does anyone have diagrams?


Last edited by stevenscottwest; 07-11-2012 at 07:00 PM. Reason: Wrong model in subject
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post #2 of 4 (permalink) Old 08-11-2012, 07:28 PM Thread Starter
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OK, just in case anyone else has this issue. You can buy a new OEM regulator from autohausaz.com for about $120.00 The mechanic had told me that the replacement regulator was different from the existing blower and the entire blower would need replaced as well. He said he was going off of Mercedes Benz notices for this model. This turns out to be blatantly incorrect. A replacement OEM regulator works just fine with the existing blower.

Getting to the regulator is a bit difficult. It is located in the passenger front footwell below the glove box. You first need to remove the upper molding from below the glove box, then the lower molding. There are two 8MM bolts and one Phillips screw holding this in place. Once this is removed, it takes some acrobatics to see up under there. I found pushing the seat all the way back, and reclining the seat all of the way down allowed me to lie on my back and look directly up at where I needed to be.

Once looking up, forget about the two rectangular boxes on the 1/2 nearest the transmission you do not need to touch these, although they look tantalizingly like you should. Focus on other half nearest the outside of the car. Although it does not look like it, that is a lid held in place by five torx screws. Remove the five torx screws, and pop the little lid down. Once you have done this, you are looking directly up at both the regulator and the blower.

I only replaced the regulator, but it is a piece of cake to get out. Once again, a torx screw driver is needed. A short one will be needed on the screw nearest the firewall as the slope of the footwell prevents a long torx screw driver to work. Thus, I had to buy a shorty at the hardware store. Once it is out, you can easily remove the two plugs, I assume you could remove the plugs first if you wanted to, but I did not want this thing to hit me in the face so I used the wires to prevent it from dropping.

To put it back in, reverse the procedure. Took me about four hours, but in reality an hour and half were wasted going back and forth to a hardware store for the torx, and a good 45 minutes was wasted just figuring out where things were. I am confident I could do it know in less than hour.

The mechanic, quoted me 1400. He wanted something 350 for the regulator which I got online for 1/3 of that, 800 for the blower which I did not need and labor was the remainder. You won't need the blower, and the labor should only really be an hour or less.

So if this helps anyone, there you are.
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post #3 of 4 (permalink) Old 08-12-2012, 07:01 PM
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post #4 of 4 (permalink) Old 10-26-2012, 08:43 AM
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Thank you for this great write-up. In my case, the problem is the blower motor brushes. I can start the blower and get nothing, but when I pull the cover off and wiggle the wires going to the brushes the motor starts right up. I went in and stretched the springs that push the brushes against the motor shaft but that fix only lasted a couple of weeks. There seems to be enough brush material left to run a long time, but it must be the length of the new brushes that push the spring back far enough to provide the proper tension.

This could possibly be one of the easiest fixes that MB dealers love to charge an arm and a leg for.

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Last edited by jessejames4; 10-26-2012 at 08:45 AM. Reason: added copy
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