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Hi there,

So yesterday i turned my fan on but nothing happened. I continued to drive and some hot air was coming out so I'm assuming it's just the fan. Rewind two weeks and I (regrettably) went to a hand car wash. Thought nothing more. Then about a week ago I noticed that the corner of the passenger foot well (top left) was soaked. I checked and no sign of a leak. I then put the fan on full on the hottest setting to dry the carpet it, which worked.

I assumed that when the guy jetting my car had sprayed into an inlet or up into the foot well... so I'm now thinking he jetted into the fan, soaking the fan, and also the carpet below it. (but i might be completely wrong).

Anyway, today i took off the panel above the foot well and took off the fan casing - it's was full of soaking wet leaves etc. I cleaned and dried all this out. I cleared any leaves that were in the fan. The fan moved when i spun it with my finger. I then checked the connections, dried them out. I then turned on the car, but no luck sadly. I think i can hear it click when i turn the fan dial, but I might be hearing things.

I've been trying to locate the fuse to check that but can't find it to see if that has blown. What else can I try or do you think I need to replace the whole fan? I'm going to try and do my best to DIY as i know a garage fix will be pricey. Luckily I'm quite small so can easily fit in the foot well :)

Thanks in advance
Amber
 

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Administrator 2009 SLK 55 AMG/Founding Member 2006
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Registered 2005 SLK55 AMG
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It will end up being the fuse, the relay or the fan motor and I would check all three in that order. If you do a search for fuse locations there is a PDF but I'm not sure if "Tempmatic" is for the heating system or not but it appears to be, there is more than one fuse. Someone that knows the 170 better than me will come along and provide you the correct information. If you can get the connections free from the motor and check them with a volt meter for 12VDC and confirm it's there when the fan is turned on then the motor is bad. Good luck!
 

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Super Moderator UK 2002 SLK320 Blue
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Welcome to the forum!

Somehow I doubt it's the car wash. If your car is kept outdoors (and perhaps under a tree) you could find it is no more than the build up of leaf and debris in the vents under the wiper blades and this with the recent rain etc. has caused the issue you face.

Probably the best thread I know of you can read is this one - and if you're reasonably flexible you can do most of the work yourself.

Come the spring one of the tasks you should be doing is to keep all of the drain holes clear - and this area falls in to this category. Once you're in the habit of doing it you can save yourself loads of grief.
 

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As savcom has said above, make sure you remove the plastic scuttle at the base of the windscreen. One drain hole lurks beneath which can block and the water overflows into the heater fan housing and then into the passenger footwell.
 

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Just completed the same job after water started to drip on my passenger's feet.

The fan is still working but copious quantities of compost was removed from the fan housing and everything dried out.

The was a lot of black foam in the compost and in the cabin air filter. Appeared to have come from a sheet of foam stuck to the firewall. Is that foam important and does that foam need to be replaced?
 

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Discussion Starter #7
Morning all!! Thank you very much for all the responses.
I've attached an image of the inside of the lid of the fuse box which is in the engine, in front of the driver. I'll try number 33 'Automatic heating system [tempmatic].. I've also checked the fuses in the boot and the ones on the right of the driver console but don't think any of these are, or would be fan related. Can anyone suggest any other fuse numbers? I'll pop to Halfords and get some new spare fuses.
https://imageshack.com/a/img923/7249/QkrjV0.jpg
@stu32 thank you for your point about the 'plastic scuttle at the base of the windscreen'. Is this easy to do? I'll search and see if there is an existing thread on how to do this.
I've had to order a new bonnet strut as mine has stopped working. Hopefully, once i've replaced the strut I'll have two hands free rather than just one (as the other is preoccupied with holding up the bonnet). The bonnet gets quite heavy after a while lol
 

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Check all fuses that mention heating system. I'm not sure which one is for the fan (37 possibly) but if it has got wet you will probably have to drop the fan and motor out to clean it all (bearings, brushes etc).
The plastic scuttle at the base of the windscreen comes off easily but you have to remove both wiper arms first, then undo the plastic retainers, then slide away from screen.
 

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Hardest thing about getting the plastic cover off at the base of the windsheild is removing the wiper arms. I'm working from memory but if I recall correctly, there is a cover you have to take of to get at the nuts that hold the wipers in place. Take those off and soak the stud with penetrant for a couple hours. It will still take a fair amount of jostlying etc to get them off.
 

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Premium Member 1999 SLK230
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Have you placed a volt meter across the plug that plugs in to the fan to see if you are getting a voltage there?
If I remember correctly one is 0 volts, one is 12 volts and the other is variable depending on the fan speed switch. If you get a reading then the fuse is ok.


I had a problem were my 2002 230 fan would not work and the fault was in the resister pack that bolts on to the fan unit. Replacement cost £17 on ebay.
https://www.ebay.co.uk/itm/heater-resistor-2108206210-mercedes-r170-slk-200-96-04-hf02uaz-sheffield/362208594918?fits=Model:SLK&hash=item5455508be6:g:zEwAAOSws0JaVN1N




Gareth
 

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Discussion Starter #11
Thanks everyone for their input. Much appreciated. After I'd taken the cover off, I did use my hair dryer to gently dry out the fan. I left everything un-done / open to dry out around the fan (and also easy access for any mechanic). All the fuses are in tact. Plugged everything back into this morning before taking it to the garage... and it works!! Initially the fan just pulsated on and more debris came out from underneath (luckily it was still all open) and then the fan stayed fully on. The fan is blowing so fiercely it was like being in a Beyoncé video lol. Am over the moon to say the least. I just need to wait for the new bonnet hood gas strut to arrive and I'm winning. More in love with my car than ever :)) Thanks everyone and I hope you all have a nice weekend.
 

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Registered 2005 SLK55 AMG
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Thanks everyone for their input. Much appreciated. After I'd taken the cover off, I did use my hair dryer to gently dry out the fan. I left everything un-done / open to dry out around the fan (and also easy access for any mechanic). All the fuses are in tact. Plugged everything back into this morning before taking it to the garage... and it works!! Initially the fan just pulsated on and more debris came out from underneath (luckily it was still all open) and then the fan stayed fully on. The fan is blowing so fiercely it was like being in a Beyoncé video lol. Am over the moon to say the least. I just need to wait for the new bonnet hood gas strut to arrive and I'm winning. More in love with my car than ever :)) Thanks everyone and I hope you all have a nice weekend.
Thank you Amber for following up, it's always helpful to others when people post the final solution to their issues, it sounds like your fan was just clogged and bound with debris. Glad you're back to loving your SLK.
 

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Mine had the same problem; the PO had not ever cleaned out the leaves, etc., and it was all hidden under the plastic cowl cover behind the battery. A big rain revealed the problem, when the fan quit and I opened it to find a massive wet compost clump falling into the water-filled footwell! Fun ensued as I went through both drain tubes and released years-old mud and leaves clogging both sides.
While I wait for the new resistor to arrive, I have noticed that there is nothing to prevent leaves, debris, etc. from going directly into the fan housing under the hood. Looks like a big rectangular hole.
Was there ever some kind of screen to prevent this?
 

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Super Moderator UK SLK 55 AMG 2007
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There is a diy for the 171, but no reason you couldn't base a mod for the 170 on that.
 
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