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#1
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Persistant Coolant Light!!
I have been having a problem with my Coolant Level light being illuminated for nearly a year now (SLK32 '03). I did run low on fluid at one point and after refilling, the dash warning did not go away. I thought I might have a bad sensor, so I replaced the coolant level sensor. That didn't fix it, so I tried filling up the washer fluid, and then replacing the washer level sensor. I considered that I might have the wrong fluid, so I bought mercedes fluid and did a coolant fluid drain and replace. None of these things have worked so far.
At this point I did a visual examination of the wires and fuses, which showed no obvious fault. I checked the plug for continuity, and it is indeed a closed circuit. The only thing I can think of is that the float is stuck in the down position. I can't seem to find a way to get at the float though. I loosened the tank and shook it around to no avail (a rubber mallet didnt help either). When I unplug the coolant level sensor, the light remains illuminated and the washer level indicator does not illuminate. Is there an easy way to un-stick the float, do I have to replace the coolant tank, or is there another common fault I can check for? Thanks for the help! I'm excited to hopefully finally finish this fix.
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Black '03 SLK32 AMG |
#2
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Coolant reservoir & w/s washer sensors are connected in series.
Most likely a sensor going open or short circuit.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#3
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Well I replaced both sensors, and I checked the coolant harness for being a complete circuit. Is there anything you might recommend I could do to narrow it down?
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Black '03 SLK32 AMG |
#4
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Have you check the resistance values of both sensors?
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#5
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maybe you can try sticking a bent coat hanger inside. fashion something straight and maybe you can reach in and "unstick" the float.
i did something similar with my washer fluid reservoir, filled it up but the light was still on so i reached in and got hte float to move up and work.
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93 300E 2.8 - The Beezy 05 Mazda3 Hatch - The Zoom http://www.fuelly.com/smallsig-us/66774.png http://www.fuelly.com/smallsig-us/24183.png |
#6
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It ended up being the pre-fuse for the radiator fan. I took it in, had it scanned, and the light was being caused by "faulty ground or broken fuse". I was only aware of three locations for fuses, so I didn't find this one which was in a fourth location. Any which way, the light is out!
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Black '03 SLK32 AMG |
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