[Juan1970]

Hi, need help. My 2006 CLK is starting the engine fan at it's highest speed about 2 minutes after the car is turned off. The fan stays on for about 2-3 min. and then turns off. The car has also started to dicharge the battery whe the car is not in use. If do not use the car for about 3 to 4 days the battery gets completly drained. changed the battery for a new one as I thought it was the problem.

Does any body have a clue?

About a year ago engine module was replaced by the dealer. Could this problem be programming?

Thanks in advance for the help.

Juan

 

[keyhole]

Please complete your profile, with model/year/location - as this is often important information to know.

The engine & a/c elecrtic fan with integrated control (M4/7) is powered through pre-fuse f32/5 (125A) from an unswitched +12v supply. However, the fan control is done by a control unit mounted on the fan unit itself.

If that unit develops a fault, the engine fan may 'never run' or 'always run'. You would have to replace the entire fan assembly to fix that.

 

[Juan1970]

Hello Keyhole thanks for your response. The car is a 2006 CLK280 and purchase in Panama Central America. I understand it was made in the Germany factory.

The fan seems to work fine the thing is that when engine is turned off, about 2 minutes after the fan starts again, as if the car was in some kind of emergency mode or overheated but the temp is ok.

Anything else you could add would be appreciated.

 

[keyhole]

As I advised, the control unit on the fan assembly decides when to turn on/off the fan - using information from the a/c system and the engine coolant system. The power is always there, even with the engine off and the key removed.

So I would consider replacing the fan unit.

 

[Juan1970]

Understood, thanks.

Do you think the decharging of the battery could also be related? The thing is that once the fan stops it stays off, until the car is used again. I haven't seen the or heard the fan turning on again. However if I don't use the car for a period of 3 to 4 days when I try to start the car the battery is completly dead.

Thanks for your help

 

[keyhole]

Well, your battery drain could be a completely separate issue. But I would clear up the fan problem first, and see if the drain disappears.

Your battery should last for several weeks without discharging. Mine certainly is OK for 4 weeks without me using the car.

Looking for a battery drain (at home) involves removing the fuses, one by one, and using a test meter on the milliamp range to check the quiescent current flowing at the battery terminals. A very tedious task!

 

[Juan1970]

ok thanks. We you recommend sending the fan module to one of this labs that actually repair the modules or would you just change the whole thing?

Thanks

 

[keyhole]

I would check the price of a new fan assembly in your country.

Are there repair facilities where you live?

 

[Juan1970]

fan assembly is about 500-600, I can get in the US. I can contact BBA Reman Inc in the US for repair as well. Let me know what you think.

About the discharging of the battery, This began to happen after I did major repairs to the A/C. I changed th compressor, the evaporator, expansion, valve and one of the pipes that connect the compressor to the condenser. The only thing I did not change was the condenser.

Do you think this might have something to do with the discharging problem? Is there something regarding programming that needs to be done when this repairs are done? (The fan problem was already there prior to the A/C repairs).

Thanks again for all your help.

 

[keyhole]

fan assembly is about 500-600, I can get in the US. I can contact BBA Reman Inc in the US for repair as well. Let me know what you think.

See what the repair quote is? However, before spending on 'guesswork', I would have the stored codes read to see if there is any reference to a fan fault.

About the discharging of the battery, This began to happen after I did major repairs to the A/C. I changed th compressor, the evaporator, expansion, valve and one of the pipes that connect the compressor to the condenser. The only thing I did not change was the condenser.

That's all mechanical work - unless you happened to damage a harness while in there.

Do you think this might have something to do with the discharging problem? Is there something regarding programming that needs to be done when this repairs are done? (The fan problem was already there prior to the A/C repairs).

No re-programing for that mechanical work. But why not remove the fuse for the a/c system, and see if the battery still drains overnight.

Try fusebox F34 (interior compartment on driver's side) fuse f41. W209 fusebox details are in the sticky threads here:

http://www.benzworld.org/forums/w209-clk-class/1629567-all-fuse-relay-box-details-w209.html

 

[insame1]

I have no clue about the 280 but I just took my 55 into Mercedes and there were to completed campaigns on the car. One being the voltage regulator and the other being the fan control unit. You might look into that. When I get my car back ill see if I can get the history report with the campaign number.

 

[Juan1970]

Thanks I appreciate the info when you get the report.

 

[Juan1970]

excellent, I'll do that and will let you know how it goes. Thanks

 

[Juan1970]

Hello keyhole, I finally replaced the engine fan as you suggested and all problems were solved. Thanks.

I have another question, My rear SAM module is not working properly, one of the brake lights along with one of the reverse lamps (same side) is not working. The dealer dignose was a faulty rear same module. The part number that is in my car (faulty one) is 2035453801. My mechanic had a used part that was previosuly installed in a C class (mine is CLK) and it worke, both lamps worked. The part number he used was different, the No. is 2035450701.

My question, is that part compatible with mine? if I use that part in my car, will it give me trouble in the future? will it damege something becasue the info in it was for another car? or is it safe to use it.

Thanks in advance.

JAC

 

[keyhole]

Hello keyhole, I finally replaced the engine fan as you suggested and all problems were solved. Thanks.

Good to read that.

My question, is that part compatible with mine? if I use that part in my car, will it give me trouble in the future? will it damege something becasue the info in it was for another car? or is it safe to use it.

Surprisingly, some MB parts are compatible across certain models. The W209 CLK was largely based on the design of the W203 C-Class model.

I have checked with my MB EPC, and the parts you listed are inter-changeable, so you will not have a problem here.

 

[Juan1970]

great news, thanks a lot for all your help. Thumbs up