2014 3500 - Low Coolant Sensor issue - - Dodge Cummins Diesel Forum
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post #1 of 15 (permalink) Old 06-15-2018, 10:42 AM Thread Starter
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2014 3500 - Low Coolant Sensor issue -

A couple of weeks back I got a low coolant message. I saw some dripping from the side of the radiator, it turned out to be a bad clamp that was letting some spray out of one of the hoses. Issue resolved, all good.

The low coolant light is still coming on. The level in the bottle when cool does not change. There is none in the engine oil. It is also not low according to the bottle.

I pulled the wheel well and jumpered the wires to the sensor, and the light goes off. I ordered a new sensor and replaced the old one, and it still says coolant low. Part number is 68354536AA.

Is it possible that I got a bad sensor? Sure. But I'd like to figure out a little more about the coolant bottle itself before I get another sensor (the first broke coming out, and it was a pain getting the remainder out).

You can't see into the bottle, so I'm trying to figure out if there is a baffle or something in there. The coolant level is visually fine and stays in the same place when cool. It's a bit over full right now, in fact.

Has anyone else ever run into this, or does anyone know if it's possible the bottle has baffles or anything that could allow the level to be different in different sections? I can't imagine that's the case, but I'm trying to figure out why two sensors would be bad.

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Last edited by RamGunner; 06-15-2018 at 10:45 AM. Reason: added part number for sensor
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post #2 of 15 (permalink) Old 06-15-2018, 09:01 PM
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My low coolant light comes on as soon as the level falls below the seam in the tank. My guess is yours is just a little low.
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post #3 of 15 (permalink) Old 06-16-2018, 10:48 AM Thread Starter
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If you read my original post, the level is visibly above the seam. It's well above the point at which the sensor trips. I'm wondering if there is some sort of preparation procedure for the sensor - soak it in alcohol or clean with brake cleaner or something. If anyone has the service manual, does it give any special process or procedure for replacing the coolant level sensor?

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post #4 of 15 (permalink) Old 06-16-2018, 01:56 PM
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I read your post. It says the level is fine. It doesn’t say above the seam. Sorry to waste your and my time.
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post #5 of 15 (permalink) Old 06-16-2018, 09:01 PM
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Mine did this also after water pump replacement. Coolant level was just above full mark on tank. Added a little more coolant and it has been fine since. Dealer told me that the newer trucks are pretty touchy about the level in tank. Level is actually above seam a bit, but it doesn't overflow or go down, it's been fine since.
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post #6 of 15 (permalink) Old 06-17-2018, 03:14 PM Thread Starter
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Just to close this - we filled the bottle completely full and it still has the same issue. Sensor is clearly covered. Short contacts on electrical connector to sensor and light goes out. Tech said most likely a defective replacement sensor, make sure you don't touch the metal parts that go in the bottle when replacing. I'm ordering another sensor.

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post #7 of 15 (permalink) Old 06-18-2018, 07:28 AM
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Quote:
Originally Posted by Jhenderson View Post
I read your post. It says the level is fine. It doesn’t say above the seam. Sorry to waste your and my time.
Same here...........

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post #8 of 15 (permalink) Old 06-18-2018, 09:33 AM
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Have you inspected the actual sensors wire? Is it possible it is rubbed through or corroded? I admit to not knowing how long the wire is but we have had issues with mice and vehicle wiring over the last few years. Good luck.

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post #9 of 15 (permalink) Old 04-09-2019, 01:49 PM
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@RamGunner
So you did not have to pull the coolant reservoir out to replace the sensor?
You mentioned gaining access by removing the inner wheel well liner; Is that correct?
They appear to be using a thyristor to do the sensing rather than a float and reed switch.
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post #10 of 15 (permalink) Old 06-13-2019, 10:17 AM Thread Starter
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If you pull the wheel well liner, you can get straight to the sensor. It's on the bottom of the bottle, pulls straight down. It has an O-ring seal. No float switch there.

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post #11 of 15 (permalink) Old 06-13-2019, 01:39 PM
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Well, the false low coolant alert is fixed!! After replacing the sensor TWICE. I took it to the dealer. Turns out than there was sediment from a actual low coolant event at the bottom of the plastic coolant tank.
The low coolant condition was caused by the dealer screwing up the radiator hose and clamp after the SECOND warranty water pump replacement.
After explaining this to the dealer the waived the labor charge and charged $149 for a new coolant tank that includes the sensor.
Finally it's fixed.
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post #12 of 15 (permalink) Old 06-13-2019, 03:58 PM Thread Starter
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Too bad they didn't just rinse the sediment out. I can see how that would have created a problem with this sensor type.

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