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Registered 2001 SLK320
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19 Posts
Discussion Starter #1
Hi, hope everybody is doing well.

I have a 2001 320 and for the past 2 months my coolant light will blink randomly every time I drive it. It started after my radiator cracked and was replaced with a new one, from that point on it will randomly blink at all times.

I have replaced the radiator, thermostat, coolant level sensor and coolant temperature sensor. All new but nothing has changed. The reservoir is full of coolant with zero signs of leaks.

She has 266k miles on her so she’s been around but drives great. I get two codes when I plug in my generic scanner, P0410 (which has been there since the day I bought it) and U0900.

Any input would be great.
 

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Registered 2001 SLK320
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19 Posts
Discussion Starter #4
Avel is correct. For some bizarre reason, they use the same trouble light. Top off the washer fluid and report back.
I’ve read about this however my windshield fluid reservoir is cracked/broken. Every time I attempt to add any fluid it leaks right through the reservoir. Makes it difficult since I cant actually see the reservoir.
 

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Administrator 2009 SLK 55 AMG/Founding member 2006
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94,921 Posts
replace it? just a suggestion :D
 

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Registered 2001 SLK320
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19 Posts
Discussion Starter #6
You’re right that is the obvious solution, just didn’t know whether that would ultimately fix the light since no windshield wiper fluid has never been a problem for me before. I will look into doing so.
 

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Premium Member 2002 SLK320
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627 Posts
I’ve read about this however my windshield fluid reservoir is cracked/broken. Every time I attempt to add any fluid it leaks right through the reservoir. Makes it difficult since I cant actually see the reservoir.

When you say it's cracked/broken, have you seen it or are you assuming that because water goes all over the floor when you fill it up? If the latter, then bear in mind that the filler neck is not sealed where it goes into the bottle, so if the bottle's full, it just overflows.......all over the floor (another daft concept).
 

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Registered 2001 SLK320
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19 Posts
Discussion Starter #8
When you say it's cracked/broken, have you seen it or are you assuming that because water goes all over the floor when you fill it up? If the latter, then bear in mind that the filler neck is not sealed where it goes into the bottle, so if the bottle's full, it just overflows.......all over the floor (another daft concept).
I’m just assuming, however I know the reservoir is empty and as soon as I put any fluid into it it will immediately leak onto the floor. It wont even give me the chance to get close to topping it off. I will take some time to remove the reservoir just to be 100% sure.
 

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Premium Member 2001 SLK200K/2001 SLK320
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1,598 Posts
When you say it's cracked/broken, have you seen it or are you assuming that because water goes all over the floor when you fill it up? If the latter, then bear in mind that the filler neck is not sealed where it goes into the bottle, so if the bottle's full, it just overflows.......all over the floor (another daft concept).
There is a seal of sorts from neck to bottle and they usually fail.
- One of mine leaks and the other doesn't upon refilling lol - but this leak in itself still allows enough fluid into the tank to be way above the low fluid level. I'd suspect the pump seal or cracked tank.

https://www.slkworld.com/slk-r170-general-discussion/74986-washer-tank-leak.html

https://www.pelicanparts.com/techarticles/Mercedes-SLK230/05-BODY-Windshield_Reservoir_Replacement/05-BODY-Windshield_Reservoir_Replacement.htm
 

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Registered 2002 SLK320
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2,011 Posts
Hi,

FWIW referring to the light on the dash, I noticed this morning that my 2002 V6 has a separate coolant light and washers light, made me think of this thread ......................

Having never run either system low I don't know if having Low Screenwash would put the Low Coolant light on or vice - versa, or even any combination of the aforementioned :grin

HTH, Cheers Dave
 

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Super Moderator UK SLK 55 AMG 2007
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26,110 Posts
Hi,

FWIW referring to the light on the dash, I noticed this morning that my 2002 V6 has a separate coolant light and washers light, made me think of this thread ......................

Having never run either system low I don't know if having Low Screenwash would put the Low Coolant light on or vice - versa, or even any combination of the aforementioned :grin

HTH, Cheers Dave
I know it sounds loopy.
But so many members have reported back on this over my short time here.
There appears to be a link.

Another MB quirk.
 

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Registered 2002 SLK320
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2,011 Posts
Hi Myk, @Avel Du ,

Yes, agreed, stranger things happen on any MB on a daily basis ......................

I'm gonna put a 5 litre Screenwash in my Boot and run it out now :grin:

I'll test the Low Coolant Light when the V8 goes in later this year :wink:

Do you perhaps know, have we had this report for both Facey's and Pre Facey's or is it just confined to one of them ??

Just might be the affected Cars have had Dash Clusters replaced but not Version Coded correctly :confused: .com

You got me curiouser than my curious 2 new kittens now lol

Cheers Dave
 

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Super Moderator UK SLK 55 AMG 2007
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26,110 Posts
I've never picked up on fl/pre fl.
My gut says both, but your comment has me wondering.

That could be the explanation that has been missing.
 

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Super Moderator UK SLK 55 AMG 2007
Joined
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26,110 Posts
Hi Myk, @Avel Du ,

Yes, agreed, stranger things happen on any MB on a daily basis ......................

I'm gonna put a 5 litre Screenwash in my Boot and run it out now :grin:

I'll test the Low Coolant Light when the V8 goes in later this year :wink:

Do you perhaps know, have we had this report for both Facey's and Pre Facey's or is it just confined to one of them ??

Just might be the affected Cars have had Dash Clusters replaced but not Version Coded correctly :confused: .com

You got me curiouser than my curious 2 new kittens now lol

Cheers Dave
I've never picked up on fl/pre fl.
My gut says both, but your comment has me wondering.

That could be the explanation that has been missing.
In an effort to find out, we now have a poll:
https://www.slkworld.com/slk-r170-general-discussion/547438-if-you-have-had-coolant-light-r170.html
 

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Premium Member 2002 SLK320
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627 Posts
Yes, there are separate indicator lights for the windscreen washer level and the engine coolant level (at least in the post facelift). However, the sensors are connected in series. I can't remember how it works but I have read that if there's a fault with one sensor it can cause the other indicator light to come on.
 

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Registered 2002 SLK320
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2,011 Posts
Aha,
@Australian ,

Thanks for that, all is now clear and I can maybe explain it, so I can sleep at night lol ......................

Dave's Explanation, (might be incorrect tho, just an educated guess) :-

Sensors may be "resistance based" rather than a straight forward switch light on / off ......................

Wired in series, the Cluster Electronics see a resistance and light up the relevant bulb, but if one sensor fails, the wrong bulb lights, (either as a fail safe or simply a feedback that MB overlooked) ;)

I'm happy for now, that'll do me until someone points out I'm "talking cock" .................... (as James May would say) :p

Cheers Dave
 

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Registered 2002 SLK320
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2,011 Posts
Hi,

I'd leave it as more data will confirm our theorys, I've added it to my reams of "check this out when bored list" lol

I spent 14 hours yesterday stripping, modifying and re roofing our Hot Tub Conservatory out in the sun, drank about 10 liters of sparkling water, got indoors about 10pm, dinner / film / bed ..................

Kitties woke me up about 5 am so I'm absolutely washed out today .................

Having a lazy day so far, will go and hoover the entire Conservatory with my Industrial Workshop Vac in a minute to get rid of all the debris, then Beer, Curry, Beer and Hot Tub on tonight's agenda :wink:

It is pouring down today, and not a leak from the roof in sight :grin:

Shame, it was a full Glass roof, lovely looking up at the Stars and regular "Northern Lights Show" but the bloody thing has leaked from the word go when we originally built it 12 years ago, and I just got fed up in the end :(

I had tried everything to cure it with varying successes / failures after the Conservatory Contractors / Company who were as much use as a chocolate whatnot, cowboys the lot of them !! :(

It's now 19mm Ply and Felted, seems to be the best up here due to the inordinate amount of water that falls outta the sky :biglaugh:

Them rolls of roofing felt felt almost impossibly heavy on my shoulder climbing up the ladder the last few hours :surprise:

Just a bit of flashing left to finish next bright dry day ;)

Cheers for now, Dave
 
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