Temperature Issue - BMW E46

kash786

kash786

kash786

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Joined
9 Nov 2010
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249
Location
Leicestershire


Above image is of my temperature gauge on my E46 320D M Sport Coupe, after my 16 mile journey to work.

As you can see, the needle is not really dead center, as you would expect it to be after the journey, has anyone else experienced this?

I suspect it may be the EGR Thermostat that needs replacing? I was actually planning on cleaning out the EGR valve, as it seems to be a common issue with them getting 'clogged' up, would this help?
 
Last edited:
Housey said:
I believe the thermostats on E46's were a weak point, I had one fail on an old 323 I had some years back, annoyingly just as I was entering the centre of London.
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Yep, seems to be the case with these - relatively cheap fix I can do myself.
 
I was always under the impression that the needle should always eventually sit in the middle.

My drive to work is predominantly A-roads but along the way I am in slow moving/stationary traffic, so I would have expected the needle to sit in the middle.
 
So, I spent my Saturday afternoon changing the EGR Stat, also removing & cleaning out the EGR Valve.

Still have the initial issue :( ..So i guess i'm going to need to replace the main stat, has anyone done this before on these?
 
Right, I replaced both stats and the coolant, all was well, car was running absolutely fine.

Now, I've noticed that the car takes a little while longer than usual to warm up, but the temp gauge needle does eventually hit 12 o'clock. I suspect there's air in the cooling system.

Does anyone know how to bleed the system on these E46's?
 
toyotacelicagt4 said:
Turn heater onto highest heat setting, set to the lowest fan speed, start engine, remove expansion tank cap, slowly open and close the bleed screw on the top hose near the expansion tank until it stops bubbling.
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  1. Turn climate control to highest temp & switch fan on to lowest speed setting
  2. Start engine
  3. Remove expansion tank cap
  4. Slowly open bleed screw until it stops bubbling


...and this is a tried and tested method that you've used?
 
toyotacelicagt4 said:
Yep. Done on about 5 e46's including mine 3 weeks ago.

*edit* Just read that yours is a diesel so should be the same? Only ever bled the systems on petrol e46's
Click to expand...

I think it's the same...the only thing that gets me is switching on the engine with expansion cap off!
 
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