Temperature gauge goes straight to red

[Bloke128]

Hi I have a e46 after a couple of minutes of starting the car from cold the temperature gauge goes straight to red I have changed both temperature sensors and the thermostat and the water pump but the problem is the same can anyone please help me

[shogun]

which E46? Built year/month, engine? Which p/n are the temperature sensors you installed? The one for the DME and the cluster gauge are different.

[MarcoZandrini]

Google “BMW E46 hidden OBC functions.” Test #2 will show you if the cluster is ok. What brands are the sensors? Aftermarket sensors are a big no-no.

[jclausen]

Yea you should be able to do a gauge sweep test this would eliminate the gauge but I forget how to do it

[harrier]

I would get OBDFusion and use its dashboard to see what temp you are reading.The cluster functions are a pain.
Are you certain there are no leaks?
did you replace the sensor in the lower radiator hose or the one under the intake manifold

[nonturbodan]

Are you having any symptoms of overheating? How is the cooling system pressure when this is occurring?

[johnjmurray]

Are you absolutely certain that the cooling system is bled of air? Air in the system can appear as overheating. Don't forget to get a new expansion tank cap while you're at it.