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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 11-30-2012, 11:17 AM
danobox danobox is offline
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Cooling System

I have a 2001 330xi with 70,000 miles. The temperture when I turn on the car either goes straight to the middle or to the right 1 to 2 degrees after it warms up, after this it does not move. I was wondering if the temp sensor would be going out or what could cause this. I think there are two sensors and which one would I need to change.

The other question is it easy to change them or would it be a tough job?
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  #2  
Old 12-01-2012, 07:17 AM
KillnTime KillnTime is offline
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Do you mean the temp needle goes right to the middle position as soon as the car starts or does it go to the middle after you've driven for a few miles?
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Old 12-01-2012, 09:47 AM
danobox danobox is offline
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It goes to the middle after it warms up
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Old 12-01-2012, 11:23 AM
joegr joegr is offline
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So, what are you saying is wrong with it?
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  #5  
Old 12-01-2012, 12:22 PM
danobox danobox is offline
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After it warms up it isn't consistent every time. It is either exactly halfway, or 2 degrees past halfway. I'm wondering if the sensor or thermostat is going bad.
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  #6  
Old 12-01-2012, 02:38 PM
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Fast Bob Fast Bob is online now
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Quote:
Originally Posted by danobox View Post
After it warms up it isn't consistent every time. It is either exactly halfway, or 2 degrees past halfway. I'm wondering if the sensor or thermostat is going bad.
If the car *doesn`t* overheat, but gets up to proper temp (relatively) quickly, and you`re getting good heat from the vents, there`s probably nothing wrong. BMW temp gauges are heavily buffered, so they`re not all that accurate like a REAL mechanical gauge would be.
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Old 12-01-2012, 06:19 PM
joegr joegr is offline
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Quote:
Originally Posted by danobox View Post
After it warms up it isn't consistent every time. It is either exactly halfway, or 2 degrees past halfway. I'm wondering if the sensor or thermostat is going bad.
It would be more likely to be an issue with the gauge in the cluster. However, two degrees of movement is very small and I would expect that to be within tolerance.

You can put the cluster into test mode and get a digital readout of engine temperature.
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Old 12-02-2012, 11:39 AM
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bluebee bluebee is offline
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This E39 M54 thread may help for the E46 M54:
- What is the temperature of the coolant when the thermostat opens under normal conditions (1)
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See also: E39 Bestlinks & How to easily find what you need
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