E-Class (W212) 2010 - 2016: E 350, E 550

Engine temp warning + fan not turning on...looking for some help

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Old 11-30-2014, 08:54 PM
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Engine temp warning + fan not turning on...looking for some help

I recently had a mishap where my car (2012 E350 Bluets) fell off the jack and it destroyed the radiator fan. I installed a new (used) fan fairly easily and thought everything was good but now it seems the fan is not turning on and the engine temp warning comes up on the dash.

The weird thing is that it seemed the fan worked at least one time, I definitely heard it spin up once after I shut the engine off (which normal on this car apparently) but now it is not kicking on.

Could it be that the fan is just bad? Or what is it that controls the fan...which sensor and could that have been damaged when the car fell?

Thanks for any help.
Old 11-30-2014, 10:28 PM
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2010 E550, 273 Engine: 2012 S550, 278 Engine
Originally Posted by hx_guy
I recently had a mishap where my car (2012 E350 Bluets) fell off the jack and it destroyed the radiator fan. I installed a new (used) fan fairly easily and thought everything was good but now it seems the fan is not turning on and the engine temp warning comes up on the dash.

The weird thing is that it seemed the fan worked at least one time, I definitely heard it spin up once after I shut the engine off (which normal on this car apparently) but now it is not kicking on.

Could it be that the fan is just bad? Or what is it that controls the fan...which sensor and could that have been damaged when the car fell?

Thanks for any help.
I'd like to know how the engine cooling radiator fan gets damaged when the car falls of the Jack. This does not sound right somehow.
Old 11-30-2014, 10:31 PM
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I was jacking the car up from the jack point in front of the engine under the car. The car slipped backward and fell while the jack stayed in the up position and hit the radiator fan breaking it.
Old 11-30-2014, 11:09 PM
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It has several sensors. It will need to be checked with Star code reader at dealer or indie shop that has one.
Old 11-30-2014, 11:18 PM
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2010 E550, 273 Engine: 2012 S550, 278 Engine
Originally Posted by hx_guy
I was jacking the car up from the jack point in front of the engine under the car. The car slipped backward and fell while the jack stayed in the up position and hit the radiator fan breaking it.
Jack point in front of the engine? Never heard of one like that. Really?
Old 12-01-2014, 12:04 PM
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Originally Posted by homeofstone
It has several sensors. It will need to be checked with Star code reader at dealer or indie shop that has one.
I have a OBD reader that connects to my phone and strangely it doesn't find any fault codes, I'm guessing the Star code reader digs deeper? Thanks for the help.
Old 12-01-2014, 12:54 PM
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Originally Posted by hx_guy
I have a OBD reader that connects to my phone and strangely it doesn't find any fault codes, I'm guessing the Star code reader digs deeper? Thanks for the help.
Yes, the star code reader is much more exact and thorough. With it there is a lot less guessing. have you checked the fuse and all connections?
Old 12-01-2014, 01:05 PM
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I checked fuse #22 in the front fuse panel as that's the one I was told controls the fan, and I did a quick look at all other fuses and didn't see any of them burned.
Old 12-01-2014, 09:02 PM
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Jack point in front of the engine????

Old 12-02-2014, 12:35 AM
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Originally Posted by Live Oak
Jack point in front of the engine????

See circled...





Old 12-02-2014, 03:10 PM
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Hmmmm. . . . They don't dare tell us that in the operator's manual.
Old 12-02-2014, 04:05 PM
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^Correct, because the jack may teeter at this location and fall away.
Old 12-02-2014, 05:42 PM
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Originally Posted by KEY08
^Correct, because the jack may teeter at this location and fall away.
On mine, the hard plastic piece crushed and broke because I didn't have the jack on center, was more toward the front edge and the weight wasn't distributed evenly.


Buddy of mine that works at a shop checked it out and says it's the fan. Said he checked fuses and voltage and everything looks good, so has to be the fan. There were two error codes stored but unrelated, cleared those.

He also said the fan has to be programmed in? Something about setting it at certain percentage points (10% -90%)? Does that sound right?
Old 12-02-2014, 08:01 PM
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Probably correct. I swear everything needs to be "programmed" on these damn cars. I'm surprised we don't need to program a new set of tires.
Old 12-02-2014, 08:16 PM
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Originally Posted by KEY08
Probably correct. I swear everything needs to be "programmed" on these damn cars. I'm surprised we don't need to program a new set of tires.
You do have to program the new tire TPMS systems after getting new tires.
Old 12-02-2014, 09:09 PM
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Ha! yes, but you can set the new psi range from the driver's seat, however you got me there!

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