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General E46 Forum
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Old 04-05-2013, 07:16 PM   #1
E46-MOTOLING
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Temperature needle problem - M43 engine

Can anybody tell me why the temperature needle rise to a high level when the engine is cold?
When opening the key to on, right up until the temperature needle into the red.
What's the problem with a heat sensor?



Thanks in advance.

Last edited by E46-MOTOLING; 04-05-2013 at 07:18 PM.
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Old 04-06-2013, 08:47 PM   #2
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Old 04-06-2013, 08:57 PM   #3
lszlszx
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It might be the engine coolant temperature sensor, or the wiring to the sensor. Does it change with the engine running?
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Old 04-06-2013, 11:01 PM   #4
E46-MOTOLING
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Quote:
Originally Posted by lszlszx View Post
It might be the engine coolant temperature sensor, or the wiring to the sensor. Does it change with the engine running?
Is the number 13 is designated temperature sensor is the purpose?
The engine is cold or being on the run, the position of the temperature needle stuck in the red.



*13 Part 13621433076

Last edited by E46-MOTOLING; 04-06-2013 at 11:03 PM.
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Old 04-07-2013, 06:08 PM   #5
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Yes, that's it.
Is your check engine light on?
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Old 04-15-2013, 11:55 AM   #6
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Mine does that too! But my thermostat is stuck open so my engine stays around 70 degrees could that be playing a role? And what is the little cylinder thing that goes into the bottom of the expansion tank? Is that a sensor also? Cause I broke mine in half but do I need it?
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Old 04-15-2013, 12:04 PM   #7
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I believe there's also a thermostat in our expansion tank. how did yours broke in half?
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Old 04-15-2013, 12:05 PM   #8
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Quote:
Originally Posted by NumbaOneNewb View Post
I believe there's also a thermostat in our expansion tank. how did yours broke in half?
Ha taking out my expansion tank haha and the car had 130000 miles so I think that also played a role in breaking it
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Old 04-15-2013, 12:07 PM   #9
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This thing, do I need to fix it?
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