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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 04-08-2009, 04:13 PM   #1
dnanorton
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coolant level low light

The original expansion tank blew. So I got a new expansion tank and sensor. i fill and bleed the coolant system according to the bently manual. Works great.....except.

I still have a coolant level light on. So I change the sensor to another new one (2nd new sensor), still coolant level low light.

The floating dipstick under the "radiator cap" shows full and the temp gauge is right on.

I pulled the sensor this time without draining anything. No coolant comes running out and the sensor is barely wet.

How is my system full and cooling just right but the sensor isn't getting any fluid to it???
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Old 04-08-2009, 04:19 PM   #2
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The sensor isn't actually immersed in the fluid, it sits inside a dry cavity in the expansion tank. It detects the float level, not the fluid level directly.

Perhaps you have a wiring problem or bad connector?
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Old 04-08-2009, 04:27 PM   #3
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can you get to the float with a long screwdriver or some thing to move it a little. mine must be stuck.
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Old 04-08-2009, 04:41 PM   #4
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can you get to the float with a long screwdriver or some thing to move it a little. mine must be stuck.
The stick that you use to determine the coolant level is attached to the float. If the top is at or near the mouth of the radiator, as should be the case if the system is full of coolant, you should be able to push it down with your finger and have it pop back up. Is this not the case?
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Old 04-08-2009, 05:10 PM   #5
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dipstick floats to the top. its deffinately full. feels real light. I bet its not attached.
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Old 04-08-2009, 05:38 PM   #6
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If that were the case, you'd be able to pull the "dipstick" out of the radiator.
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Old 04-08-2009, 06:15 PM   #7
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then i dont know wtf is going on.
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Old 04-08-2009, 06:22 PM   #8
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then i dont know wtf is going on.
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Originally Posted by TxZHP04 View Post
Perhaps you have a wiring problem or bad connector?
There's always the electrical side of things.
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Old 04-08-2009, 08:22 PM   #9
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there is only 2 wires I can jump them and see if he light goes off. That will rule out electrical.

One thing I noticed. The original sensor was different than both the new sensors. It didn't have the black straw around the sensor stick. it was bare. I wonder if the new one is too thick to sense the float or something.
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Old 04-08-2009, 08:27 PM   #10
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I hear stories that if u tap the side of the tank it will pop back up also try not to get in and grab it because it might crack...
Plastic gets week after a while
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Old 04-08-2009, 09:28 PM   #11
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Got a picture of one of the new sensors?
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Old 04-08-2009, 09:32 PM   #12
dnanorton
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its brand new and so is the sensor. I think if it is a prox sensor then mayne it needs to be closer.
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