At first I was expecting a trouble-free MB. Now, at 2,500 miles trouble 1. The other night, Check Coolant Level! displays on the E55. Engine temp is slightly warmer than normal (about 95). I press the wrench button for help. After waiting about 10 minutes I get connected to a tech (with a poor connection) who tells me to continue home and MB would contact me. Someone actually called back! Sent a tech to the house at 11 PM. Coolant level was OK, so the sensor was assumed to be the culprit. Next day, my dealer calls to get me in for service. Got a C230 Kompressor for the day. Quite a car, nice hiway cruiser-hums along at 90MPH! They find no problem, coolant level OK, Sensor OK, so they reset the computer, no problem found. Anyone ever experience this situation?
Gary

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http://clubs.snap.com/mercedesbenze55registry/index.lhtml
00 AMG E55
96 DCM Impala SS
94 ZR-1
81 Corvette Cpe

At least 5-10 times. The coolant level & w/washer reservoir sensor are in series & if either sensor has a short or open circuit the coolant level warning will come on. Try disconnecting the w/washer sender & watch the MIL lamp come on.

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MERCEDES BENZ MASTER GUILD TECHNICIAN
ASE MASTER TECHNICIAN
27 YEARS DEALER M.B. Shopforeman
190E 2.3 ITS RACECAR
1986 190E 16V

If you dealer doesn't know this by now, give them the big DUHHHHHHHHHH.

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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

OK, I'll bite. Does that mean that if W/washer fluid is low, I'll get a low coolant message? After all, low coolant or W/washer sensors just open the circuit when the system is low, right? I hope the system knows the difference between the two. Thanks for your responses!
Gary

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http://clubs.snap.com/mercedesbenze55registry/index.lhtml
00 AMG E55
96 DCM Impala SS
94 ZR-1
81 Corvette Cpe

DDDDDDUUUUUUUHHHHH!!!

That's too funny.

I've never had the coolant sensor go bad, it has always been the washer sensor, and I have seen alot of them go out on the new c-class cars.

John.

[QUOTE=zrusny]At first I was expecting a trouble-free MB. Now, at 2,500 miles trouble 1.
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Please let me know when you find a 6 year old vehicle ( any make ), that does not exhibit some MINOR electronic glitch, now and then.
I'll be first in line to buy it.

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2007 C 230 Sport.

I agree with Manny.

But in reguard to the cluster interpreting which sensor. The ECL has a normal resistance of 105-120 ohms. The windshield wiper fluid level switch has a normal resistance of 145-185ohms. So with all levels OK the cluster sees from 250 - 305ohms for the series circuit. When either level goes low the switch shorts and goes to 0 ohms. Since the resistance is in series the resistance of the switch at proper level is left to be read. In other words if the ECL switch sees low coolant it goes to 0 ohms and the series circuit now reads 0 + 145 to 185 ohms. The cluster see the resistance and recognizes the coolant level is low.

Another unique situation is where the sum total doesn't fit any of the situations. In this case a text display comes up stating something like "error in display".

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

So, it looks like the cluster can differentiate between the two but is the CHECK COOLANT light the only indication that one of the levels is low, i.e. with low washer level you get CHECK COOLANT?

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2012 E350 Bluetech

[QUOTE=manny]94 Acura legend

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82 300D....went to MB heaven
90 350 SDL....excercising con rods

[QUOTE=andmoon]Yeah, my 1965 Austin Healey Sprite too.

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2007 C 230 Sport.

[QUOTE=manny]
Ok, do you want to buy my 96 Ford Ranger, has 84,ooo miles on it and never, ever had one problem with it, not a leak, squeek, or skip, keep it well maintained and don't beat it.

Sorry, just kidding, not for sale, But I am going to build a hot rod out of it after my barracuda project is finished.
Yes, I'm going to hack it up, remove the 4-cyl ,5-spd and put a small block
v/8 between the fenders, on crack, maybe, but having fun with the torches.

I will sell the original drive train though.

It is currently my service truck see it here at http://home.bellsouth.net/p/PWP-Benzmobility

Also look at my other projects ni photo album.

Oh ,ps, replace the washer sensor.

[QUOTE=manny]
Does Harley count?? You did say electrical problems not oil leaks

__________________
I really gets fun when they all don't run

84 500SL
99 Jeep XJ
93 Jeep YJ
03 Custom Softail

All I gotta say is...LUCAS.

The other thing to watch is the sensor colour...early one where white and then they went to black.....they do NOT interfit.....although MB will tell you they do.

The different resistence between the 'coolant' and 'washer' make the correct light come on.Trouble is, as has been explained...the failing sensor will change resistence fooling the monitor. From the few I have repaired, it seems the default is COOLANT LOW.

FWIW and FYI....Mice seem to like to chew the wiring under the plastic covers...and there's a ground post there too.....lift off the cover and check....they seem to like living in the HAVC system plenum.

.

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[http://languageandgrammar.com/2008/01/14/youve-got-problems-not-issues/ ]

"A liberal is someone who feels they owe a great debt to their fellow man, which debt he proposes to pay off with your money."