E46 temperature Dial staying on cold ?

[mattylad]

Hi Guys

Sorry I am new to this, but I shall try to explain best I can.

basically I have a BMW E46 318i 2001 and the engine temperature dial on the dashboard inside the car stay just above the Blue square and that's pretty much where it stays for a whole trip, at 1st I thought that its ok because its winter so maybe that would effect how hot the engine gets but doing a normal trip to work used to put the temp dial to the middle (where it should be) if I sit in traffic for about 10 mins it slowly gets its way to the middle of the dial but then when I start moving it makes its way back to the cold, I have replaced a sensor however I believe this was the coolant sensor but this really has no effect on this problem what so ever I have noticed the fuel is being drained a little quicker then it used to be so mayb this is the reason why ? I have no idea how to fix this and any help would be really helpful

 

[wikked]

Your thermostat is stuck open. Your engine is therefore running cold and it adversely affects your fuel consumption. More than likely you just need to replace the thermostat


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[mattylad]

Your thermostat is stuck open. Your engine is therefore running cold and it adversely affects your fuel consumption. More than likely you just need to replace the thermostat


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Oh Ok that sounds simple enough would you happen to know the rough cost of these and best place to get them ? also is this a tough job to sort out ?

Many Thanks for the quick response

 

[Yuben]

Yep definitely related to the thermostat. Best to get is sorted out as it can affect fuelling.

 

[jerzi]

What area are you from?

 

[nicholasslimpic]

Yes Def thermostat

 

[Nikhil]

It might be the thermostat but I highly doubt it, as even if the thermostat failed in the open position the car will get out the “blue” area on the heat gauge. Its most likely the temp sensor that’s failed and providing A false reading to the gauge cluster. I am not so sure where its located on the 4 cylinders however on the 6 cylinders its located on the cylinder head. You might have replaced the fan switch and not the temp sensor.

 

[Ricky318i]

Had the same problem with my E34.

Thermostat MISSING!!!

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[Kavi44]

:blueCry:

 

[spikester666]

I had the same issue with My 2000 e46 318i pre f/l, i replaced both the thermostat and the water temp sensor just to be safe. Both are rather simple to do and if you have a couple spanners you should be fine.