The coolant level indicator light - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 08-18-2008, 11:32 AM Thread Starter
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Unhappy The coolant level indicator light

Hi all.An E-Class 210 drove into my garage and complaint about the Coolant level indicator light.The light was on after i ran the engine.sometime will off for a moment,then the light pops up again.
After ran short test by star diagnosis,the result shown in the HHT was Electrical Suction Fan Short to Ground.Below are the remedy works done:
1.To change the coolant level sensor.
2.To change the ECT.
3.To perform wiring test on the coolant level sensor to washer level sensor and the connections to instrument cluster.
4.To reconnect the coolant level sensor wiring to the instrument cluster and washer level sensor.
5.To perform wiring test on the N75
6.To change N75 after the wiring tested.
7.To change the Instrument cluster.
8.To change Outside Temperature sensor.
I've done what i listed above.The light is still on.Any one of you can provide some technical support or instructions for me...please.....
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post #2 of 8 (permalink) Old 08-18-2008, 06:54 PM
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Yep, replace the washer level sensor, seriously, they are wired in tandem.
Always start with the washer level sensor inside the top of the washer jug.
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post #3 of 8 (permalink) Old 08-19-2008, 05:10 AM Thread Starter
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Thanks for your reply benzfixer.I changed the washer level sensor.The problem still there.T think could be the front sam.How do you think???
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post #4 of 8 (permalink) Old 08-19-2008, 06:16 AM
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Thanks for your reply benzfixer.I changed the washer level sensor.The problem still there.T think could be the front sam.How do you think???
Previously on your list you mentioned the coolant level sensor being changed but you did not mention the washer resrvoir level sensor, so did you actually change both?

I would double-check the resistance over the sensor when the switch is open and also when it is closed. You should measure a correct resistance for both cases, not zero, nor open circuit. The same for both sensors. You could also measure the voltage at the closest wire towards the SAM.
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post #5 of 8 (permalink) Old 08-19-2008, 08:07 AM Thread Starter
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Diesel Benz,i forgot to inform you all that i changed the washer level sensor from my dad's 210.The problem still there..I performed wiring continuity test,components test according to the WIS.I even made new wiring for the circuits.I've no idea how to do it now..please...
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post #6 of 8 (permalink) Old 08-20-2008, 06:43 AM
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Do you have any corrosion on the connectors?

You said you changed the sensor from your Dad's 210?
Then at the beginning of your original question you said a 210 pulled into your garage??
Did you use it for the car in question, or is the 210 your dad's car, the only car in question?
I had trouble figuring out which car was which.

If you robbed the level sensor from another car, you may want to try a new one, and even a new washer level sensor, and clear all the codes out and start fresh.
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post #7 of 8 (permalink) Old 08-20-2008, 07:10 AM
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Testing with a new sensor would rule out an issue with the old replacement part but you might end up buying a sensor that you don't need.

The resistance values for each of the two sensors should appear on the documents at reach for the OP. If the measured resistance is correct when the sensor is open and respectively when it is closed, that would meant the issue being at the wiring or the SAM. Even wiring can be excluded if measured from the wire at the SAM (it would have to be disconnected to allow proper resistance measurements). I don't see why the OP does not want to use a simple multimeter.
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post #8 of 8 (permalink) Old 08-20-2008, 08:06 AM Thread Starter
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I cleaned the wiring harness and connectors.My dad also driving E-class.That's why i can swap it as i can.sorry man...made you confused...
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