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#1 Old 10-17-2009
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blower fan not working 1997 slk 230

hi

just thought id post a problem i fixed myself. i needed to use the heater in my slk (gettin colder here in u.k. now!!) and found it was not working because the fan wasnt working,after checking the relavent fuses and finding them to be ok, i turned my attention to the blower fan. it is to be found under the glovebox by removing a plastic panel underneath (2 screws) and this reveals a black plastic box with 2 slider lugs on the front. slide the 2 sliders to the centre of the box and prise the lid off. i was rewarded by leaves, muck and lots of dust!! undo 3 torx screws around the edge of fan and then undo the 2 torx screws on fan regulator assembly this will remove the regulator assembly revealing a hidden torx screw at the back rear. having removed this, the fan assembly will drop out and you can begin the process of cleaning it all up. (i found a foam plastic piece had fallen down into my fan assembly and was effectively jamming it all up). whilst you have the fan assembly out just put a couple of drops of oil on the rear bearings and check the condition of the brushes too. this is a really simple fix and will save you a fortune. hope this tip helps!!

kind regards, pete
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#2 Old 10-19-2009
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Quote:
Originally Posted by peteslk View Post
hi

just thought id post a problem i fixed myself. i needed to use the heater in my slk (gettin colder here in u.k. now!!) and found it was not working because the fan wasnt working,after checking the relavent fuses and finding them to be ok, i turned my attention to the blower fan. it is to be found under the glovebox by removing a plastic panel underneath (2 screws) and this reveals a black plastic box with 2 slider lugs on the front. slide the 2 sliders to the centre of the box and prise the lid off. i was rewarded by leaves, muck and lots of dust!! undo 3 torx screws around the edge of fan and then undo the 2 torx screws on fan regulator assembly this will remove the regulator assembly revealing a hidden torx screw at the back rear. having removed this, the fan assembly will drop out and you can begin the process of cleaning it all up. (i found a foam plastic piece had fallen down into my fan assembly and was effectively jamming it all up). whilst you have the fan assembly out just put a couple of drops of oil on the rear bearings and check the condition of the brushes too. this is a really simple fix and will save you a fortune. hope this tip helps!!

kind regards, pete
While in Vegas this year during the SLK 2009 Retreat my AC blower motor quit working in >100 degree heat. Fortunately while visiting and touring the Fletcher Jones MB dealer they were able to install a new blower motor and regulator (they recommend replacing both) for me in my 2003 SLK 320. It was all done under my extended warranty and I never lost a second with the group before heading up to Mt. St. Charles for lunch. Greatest 'dealer' experience I ever had. The mechanic even let me watch him after I asked if it would ok. He was friendly and informative and also told me that the motor brush problem is a pretty common problem in our models but easily repaired. I had some debris but not as much as you experienced behind the black cover. I have worked on my own cars and motorcycles for years so it was fun chatting with him and learning. Glad to hear you repaired it without high cost....that's always a good thing...LOL
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#3 Old 02-25-2010
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Very helpful description! Thank you very much!
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#4 Old 02-25-2010
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#5 Old 09-09-2010
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Had similar trouble in my '01 320. Blower not working at all. Dropped it out of the dash, bunch of dirt came with it. Spun it a few times to see if it was locked, and spins but with a little effort. Rehooked up power and tried the fan for the heck of it, nothing until I gave it a little help, then it seemed to work fine. Then turned it on and off a few times and it worked, although once it took a couple of seconds before it started spinning. Any ideas?
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#6 Old 09-10-2010
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motor blower

hi, im not sure if the brushes to the motor are a replaceable item? but if they are then they could possibly be the problem. failing that its possible that your regulator assembly on the motor is faulty or a low voltage going to the motor. hope that helps and good luck!

regards, peter
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#7 Old 09-13-2010
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Quote:
Originally Posted by peteslk View Post
hi, im not sure if the brushes to the motor are a replaceable item? but if they are then they could possibly be the problem. failing that its possible that your regulator assembly on the motor is faulty or a low voltage going to the motor. hope that helps and good luck!

regards, peter
Another problem may be the bushings at the armature axle ends. I don't think they use bearings but I could be wrong. Try a "light squirt" of WD-40 or silicone spray at the bushings to see if that frees thinks up...good luck...
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#8 Old 10-01-2010
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Thats a really useful post Pete. My 2000 230 has a problem with the blower. When needing to demist the windscreen quickly, I turn the fan to the highest position and obviously adjust the heater dials to the hottest position. Most times, the fan immediately runs at high speed but but sometimes it doesn't start at all initially and starts slowly before suddenly coming on at full speed. It is almost as if it is being governed by a thermostat. Is this likely to be the regulator?

Any help appreciated

Steve
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#9 Old 11-26-2010
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Thanks for this peteslk,
Found this forum thanks to your post and google.
I am just down the road from you (Wigan), and have the same problem. Had started to think I would have to face a high garage fee to get it fixed. As had checked the obvious like fuses. Thanks to you description I am going to have a go as it sounds easy enough to get at. Think you may have saved me a bit of money here. Ta.
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#10 Old 11-26-2010
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#11 Old 11-27-2010
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so a fellow northerner !!! yeah i hope my suggestion does the trick for you as i suppose it could be a wallet busting experience otherwise. i really love my slk, not had much chance this year to have the top down but hey! this is england ! take care for now, pete
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#12 Old 11-28-2010
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There is a similar thread (Replacing the Heater/AC Motor) running alongside this. I would be interested to hear of a solution but, at the moment my car is under about 300mm of snow.

Steve
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#13 Old 11-29-2010
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Just done the job.
Took less than 40 minutes from opening the passenger door
Thanks for the tip about the hidden torx screw or it would have taken a lot longer.
Yeap, mine was full of a load of leaves as well.
Replaced the total unit with one from an AMG 2003 that I bought from ebay for £50 delivered. Fitted straight in and works great.
Also took the filter out to clean that was next to it while I was under there, that had loads of leaves in it as well.
So all working great, which is a good job now this winter weather has arrived.
Thanks again peteslk.
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#14 Old 11-30-2010
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Sounds like the standard fix, I did the same - pulled the old unit out, replaced the fan and regulator for about $120 American and worked like a charm. The date stamp on the unit was 2005 (my SLK is a 2001), so evidently it had already seen one replacement, I would imagine for considerably more than what I shelled out...
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#15 Old 12-01-2010
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I haven't had a chance to get to mine with the holidays, maybe tonight.. Hopefully it is as simple as something stuck in the fan..
I was able to work on it last night, I moved the fan around some and tried it, started working!

So I pulled it out, used some dry lube on the bottom bearing. Not sure how long it will last but seems to be working fine now. I'm guessing it will quit on the coldest day possible. I couldn't get to the fan side bearing, it looks like they don't want you to take the fan off and I wasn't in the mood to disassemble.


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Last edited by paultalb; 12-02-2010 at 09:00 AM.
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#16 Old 12-20-2010
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Footwell Blower / heater

Hi,

Please tell me if what has been discussed here will also solve my problem of the footwell blower / heater not working. Works fine on all other settings?

Thanks
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#17 Old 12-21-2010
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Originally Posted by craigamiller View Post
Hi,

Please tell me if what has been discussed here will also solve my problem of the footwell blower / heater not working. Works fine on all other settings?

Thanks
I would guess that is a switch issue. Does the fan quit, or just not switch to foot?


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#18 Old 12-21-2010
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Hi,

Please tell me if what has been discussed here will also solve my problem of the footwell blower / heater not working. Works fine on all other settings?

Thanks

If the blower motor is turning and if air flow has stopped or minimized at the top air ducts when turning the directional air flow switch to the floor ducts, check the floor ducts for blockage or if debris has entered the footwell ducts. Also while the engine is off and key is on, if you can, get down and listen to see if you can hear the vent door shifting from upper vents to lower. This would be a quick way to start the troubleshooting....
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#19 Old 02-05-2011
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Blower

Thanks Pete, saved a lot of time dismantling the blower motor without breaking anything. A small squirt of CRC ( = WD40) made the job!

Patrick
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#20 Old 04-15-2011
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This is a stupid question but if I'm attempting to do what described above, do I need to disconnect the battery or anything?

my fan/heater stopped working ages ago!
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