Frustrated - Want to get my coolant level indicator issue resolved

coventryslk

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Hi

A few people ave commented that the Coolant Level indicator light could be affected by the washer switch as they are part of the same circuit and wired in series. I am still able to use my washers/wipers when the coolant light comes on though?

If it still is the Washer switch that is causing the problem? where do i find in the engine bay??? What wire is likely to be loose or damaged? Ive changed the coolant level sensor already.....

Matthew
 

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The water level switch is pushed into the side of the water bottle, it is wired in series with the header tank switch, you could see that in the wiring diagram that I sent you
 
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coventryslk

coventryslk

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The water level switch is pushed into the side of the water bottle, it is wired in series with the header tank switch, you could see that in the wiring diagram that I sent you

so it could be the switch that is faulty?? even though it still works
 

bigasotonuk

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We are talking the water level switch fitted in the tank, not the the steering column mounted stalk.
 

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On the diagram that I sent you, you can see that switch 42 is the washer tank level switch and the wire that come out goes direct to switch 41 so if either switch is faulty it will throw up a warning. It is a lousy idea, but that is the way that they have done it
 
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coventryslk

coventryslk

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On the diagram that I sent you, you can see that switch 42 is the washer tank level switch and the wire that come out goes direct to switch 41 so if either switch is faulty it will throw up a warning. It is a lousy idea, but that is the way that they have done it

Went to Stratford Mercedes earlier today. Bought the water level switch, swapped them over this afternoon. Went for a long drive, and the coolant level indicator came on!

I have replaced the

coolant level sensor & Water level switch (one in the water bottle with a white waxy float)

What else can i do???? please help
 
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coventryslk

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Went to Stratford Mercedes earlier today. Bought the water level switch, swapped them over this afternoon. Went for a long drive, and the coolant level indicator came on!

I have replaced the

coolant level sensor & Water level switch (one in the water bottle with a white waxy float)

What else can i do???? please help


unplugged the coolant level sensor earlir...no more stupid irritations
 
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coventryslk

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I cannot remember how to use one - i used one in school and when i started an apprenticeship in a power station...i just cannot remember!

If you were to identify whereabouts to start checking (once ive remastered using a multimeter) where would you look?
 

Cole@MBS

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You need to check continuity to earth and to postive and check what ohms across the two pins is, i can look up what it should be tomorrow for you if you get stuck!
 
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coventryslk

coventryslk

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You need to check continuity to earth and to postive and check what ohms across the two pins is, i can look up what it should be tomorrow for you if you get stuck!

Thank you much appreciated
 

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SAM the S41 switch water level is in series with the S42 washer level switch, the fault is odd,I will look further but I have just sunk tonight
 

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This is a recorded fault, and I have sent you the test paper.

Also to SAM
 

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