Bmw E90 320i N46 normal coolant temp.?

[arico]

Hello

I have a Bmw 320i 2005 E90 .. My coolant temp is ranging between 105 -110 °c when motor is hot. One of my friend told me its too high and i should change thermostat and waterpump . Both are changed but temp is still showing 110 ° c .

Now i am wondering my friend was wrong because ive checked other forum where some are mentioning it is normal temp but some other says 90 to 95 are normal.

So thats why i ask here and hope someone can confirm what are normal coolant temp .. ?

I hope someone can help me out.

[MarcoZandrini]

I'm not an expert on the E90 chassis or its engines, but I have owned an E46 for 15 years. I also participate in this and other BMW forums.

That said, the engine's in the E46 chassis typically run in the 95*C to 100*C range. Why? Emissions and fuel efficiency. The hotter the engine the better the fuel efficiency. For emissions the engine and the pollution reducing hardware are designed to operating in a specific temperature range. That range is noted above. One other thing: the temperature gauge in an E46 is controlled by the engine management computer (ECU). The gauge needle will be straight up when the engine's temperature is in a rather wide range of values, include in excess of 110*C.

So, unless you're see indications of overheating I think your engine and its cooling system are operating in a proper temperature range. However, cooling system of every aluminum engine requires proper maintenance and surveillance.

[nickxtsui]

My 2011 328i xDrive (N52 engine) runs about 85C - 96C in coolant temperature. 85C is for idling, and 96C is the highest I saw when I am driving under 95C ambient temperature.

[BimmerBreaker]

Thermostat would likely not be a culprit here anyways, when they fail they fail in the open position, so if anything the car would run colder. Waterpump going bad would have been a serious problem and temperatures likely would have continued to climb, not levelled out at any temperature or temp range. AKA would have just continued to heat up until the engine melted.

If there is a problem here - and I'm not convinced there is - it is likely one of the fans...

Also, those engines have two coolant temp sensors AFAIK. One reads the temperature inside the engine, one reads the radiator outlet temp. 105-110 C may be high for a radiator outlet temp, but if the OBC is reading the temp of the coolant in the engine, this would be about right. I would double check what numbers you are even looking at before attempting to further diagnose. And to be fair, if the engine is running fine, I wouldn't worry myself with this... if it holds these same temps consistently day after day and runs fine, what reason do you have to expect any problems?

[opjose]

My 2011 335ix runs around 100-112c during normal driving even after a thermostat and pump change.

The Bentley manuals states that temps up to 120c are within the normal "Eco map" range for the vehicle.

From what I calculate that works out to about 24-26psi pressure levels required to keep the coolant from boiling.
Could someone explain why such high pressures are not seen throughout the cooling system?

[peterhitch]

Hello

I have a Bmw 320i 2005 E90 .. My coolant temp is ranging between 105 -110 °c when motor is hot. One of my friend told me its too high and i should change thermostat and waterpump . Both are changed but temp is still showing 110 ° c .

Now i am wondering my friend was wrong because ive checked other forum where some are mentioning it is normal temp but some other says 90 to 95 are normal.

So thats why i ask here and hope someone can confirm what are normal coolant temp .. ?

I hope someone can help me out.

The temp on my 2005 320i E90 runs at 98-105 degrees.....at 105 it quickly drops back to 100.I do know that I have a 105 degree thermostat fitted.Hope this helps.