CLK 320 Blower Motor Brushes (W208)

[BDE1V]

On travelling down to the Isle of Wight for summer holiday my Blower Motor decided to give up on me ( temperatures in the late 20 degrees all week.
Eventually decided to go to the Mercedes Dealer at Newport for Advice regarding the problem, giving him all symptoms of no fan working etc. His advise was Quote: "Oh, we'll have to strip the dashboard out, locate the fault & then order the part. There's no way we can get the repair done with a couple of days left on your holiday". I then said I only popped in for some advice, I realise you wouldn't be able to sort the problem..But he then went on to advise me to get the Air Conditioning system Charged..
A likely story I thought!! The Fan still didn't work with the Heating Controls set to Max.
Anyway With some excellent advise on this forum where to find the Blower Motor, I diagnosed the fault to the Blower Motor brushes.
The Dealers don't supply these and will only sell a replacement Motor +Fan at £121+VAT.
I've managed to source these at location below £19.95/pair + shipping.
http://www.tubesonline.com/index.asp?function=DISPLAYCAT&catid=34

I,ve inserted some fault finding pics & advise for anyone concerned about doing the job themselves.
1. 1st Remove the three panel screws on the underside of the passenger footwell in the picture & turn the plastic panel screw a quarter of a turn & remove the cover before pulling forward & dropping down the facia panel.
2. Slide the white plastic clips to their opposite positions to drop the Blower motor housing Cover Down & ease it forward so that the rear of the Cover pulls away from the slots that the rear clips fit into.
3. Remove the 3 way Plug to the Regulator.
4. To clarify that regulator is not faulty you need to check the following being careful not to short out any terminals whilst measuring with a DVM.
5. With the Plug off the regulator you should measure 12V+ with your DVM between the Brown & Red Leads ( outside pins...Brown being -ve).
6. Now switch on the engine & measure between Brown & white ( brown being -ve lead)
7. With Fan speed at 1st position you should read 100mV
8. With fan at 3 position you should read approx 3V
9 With Fan at 5 position (max) you should read 6V approx
10. If this is correct then the controller feedingthe regulator is OK
11. connect the Lead back onto the Regulator & Measure across the 2 Heavy Conectors that are on either side of the Regulator ( the ones that go to the Motor) with the Fan speed set to Max you should have 12v going to the Motor, this should lower accordingly as the fan speed is reduced.
12. If the above happens then the Regulator is OK & the problem will be with the motor.
13. To remove the motor first switch off the Ignition & remove the 3 Way Plug thats attached to the regulator.
14. Remove the two screws that hold the Regulator in place with a Torx t20 Allen Key or Small T20 Torx screwdriver
15. This will now give you access to all the Screws that hold the motor in Place.
16. After removal of the motor Pull the regulator plug out from the Motor & measure the resistance with a DVM ( if it reads open then the motor brushes have a good chance of being worn & will need replacing.
17. Two screws in the top of the motor hold the plastic cover on thiese will need to be removed & the plastic cover slid off to give you acess to the motor Brushes.
A soldering Iron will be required to replace them.
18. Fitting is a reversal of previous actions.
I'll add other attachments in a thread to this

 

[BDE1V]

320 Blower Motor More Attachments

More attachments

 

[BDE1V]

CLK Blower Motor Last Attachments

Last two pics.

You'll need a T20 Torx Driver (Small Length or Allan Key because of space restrictions) a Philips Screwdriver & A soldering Iron & Some solder for removing & refitting the Brushes from the Motor.
regards
BDE1V

 

[Mercedes cozy]

Excellent. Very usefull information.

 

[Shude]

Multiple threads merged into one...

Great pics and useful advice, thanks BDE1V!

 

[CLK 320 AMG]

Good thread BDE1V; However just a little trick; i managed to find a local vehicle electrician and he just wittled down some brushes and he fitted them for me for just £8.... Keep it local. Just my two penith....

 

[jskyrme]

All hail BDEV1

I've been searching for this information for quite some time - what a superb article for diagnostic checking. I feared my problem was with my control system - fortunately it wasn't. Then I thought I might need a new regulator: fortunately I don't. So that left only brushes. I haven't got any yet (I only deduced the problem an hour ago) but this has saved me tons of time and money. Thank you! :bannana:

Incidentally, I could have saved even more time on reflection if I did what I did to solve it temporarily - after removing the cover, whack the motor with the handle of my screwdriver to provide "temporary brush relief". If I'd done that first, I could have skipped the first few checks and worked out it was the motor brushes straight away! Doh

 

[greenwelly]

First Class & Many thanks

Now all an old man has to do is to fold himself into the footwell:bannana:

 

[cyberflex]

That really is excellent information BDE1V.
Thanks buddy if you are still active on here.

 

[kuripot]

BlowerMotor

Thanks for the informative guide BDE1V. I sourced a replacement motor on ebay as the percussion engineering trick had already identified it as the brushes. I reckon the job took around 30 minutes most of which was locating my torx driver and getting the fan blades separated from the motor.The rest was easy. I may get around to replacing the brushes on the motor I took out for a spare.

 

[Chris56000]

Thank you so much for this lovely clear "Car Mechanics" style Step-By-Step Member BDE1V Sir!

I've my friend's W208 CLK to do with the same trouble 2mrw!

Chris Williams

 

[Bernie36968]

Thanks for this, my fan has started playing up, it doesn't always start when you switch on the ignition but comes on when you start driving. the frequency that this happens is increasing and the number of bumps you have to go over before it cuts in is increasing rapidly. sounds like classic brushes to me.