[Buckeyes]

Anyone know what the engine coolant temp normal operating range is? My 335i runs about 225 F.

[COKen]

Are you sure that isn't your oil temp? If it is, then that temp is OK. ( I don't think BMW has put coolant temp displays on our cars for some time now.)

[Buckeyes]

Originally Posted by COKen

Are you sure that isn't your oil temp? If it is, then that temp is OK. ( I don't think BMW has put coolant temp displays on our cars for some time now.)

I have a obd link scan and its showing coolant temp.

[E90Fleet]

The engines have variable MAP controlled thermostats, so coolant temperature varies depending on the mode the ECU is in.
Its one of the reasons BMW dont show coolant temp anymore to regualr drivers

Range is from 80C - 111C (176F - 231F )

"Normal" is around 105C (221F), so your 225F is perfect
ECO mode will take it to 111C (231F)

[Mike_L]

I believe the thermostat opens at 105°C, so coolant temp should be in the 221°F area.

[E90Fleet]

Originally Posted by Mike_L

I believe the thermostat opens at 105°C, so coolant temp should be in the 221°F area.

Nope. MAP controlled

[Buckeyes]

Thanks for the info

[Billfitz]

The coolant temp is going to be about the same as the oil temp. 225 seems high, as water boils at 212, but the coolant isn't pure water, and it's under pressure, which also lowers the boiling point.

[Mike_L]

Originally Posted by Billfitz

The coolant temp is going to be about the same as the oil temp. 225 seems high, as water boils at 212, but the coolant isn't pure water, and it's under pressure, which also lowers the boiling point.

Pressure and coolant raise the boiling point.

[Billfitz]

Originally Posted by Mike_L

Pressure and coolant raise the boiling point.

I meant raise, of course. That's what I get for going on line when I should be going to bed.

[JJS]

Originally Posted by E90Fleet

The engines have variable MAP controlled thermostats, so coolant temperature varies depending on the mode the ECU is in.
Its one of the reasons BMW dont show coolant temp anymore to regualr drivers

Range is from 80C - 111C (176F - 231F )

"Normal" is around 105C (221F), so your 225F is perfect
ECO mode will take it to 111C (231F)

Originally Posted by newwaysys

The engines have variable MAP controlled thermostats, so coolant temperature varies depending on the mode the ECU is in.
Its one of the reasons BMW dont show coolant temp anymore to regualr drivers

Range is from 80C - 111C (176F - 231F )

"Normal" is around 105C (221F), so your 225F is perfect
ECO mode will take it to 111C (231F)

There is an echo in this thread.

[Kev314]

Originally Posted by newwaysys

The engines have variable MAP controlled thermostats, so coolant temperature varies depending on the mode the ECU is in.
Its one of the reasons BMW dont show coolant temp anymore to regualr drivers

Range is from 80C - 111C (176F - 231F )

"Normal" is around 105C (221F), so your 225F is perfect
ECO mode will take it to 111C (231F)

Makes you wonder about toggling between modes since it might never operate at the optimal temperature with frequent toggling. I suppose the variations are nowhere near as severe as during warm up from dead cold.

[E90Fleet]

Originally Posted by Kev314

Makes you wonder about toggling between modes since it might never operate at the optimal temperature with frequent toggling. I suppose the variations are nowhere near as severe as during warm up from dead cold.

The ECU modes are not linked to the modes you can select for the gearbox and suspension.

The ECU modes are ECO,Normal,High and High+.

The ECU automatically determines which mode to go into depending on driving conditions.
The driver cannot select the modes.

[Kev314]

Originally Posted by E90Fleet

The ECU modes are not linked to the modes you can select for the gearbox and suspension.

The ECU modes are ECO,Normal,High and High+.

The ECU automatically determines which mode to go into depending on driving conditions.
The driver cannot select the modes.

OK - Thanks for the explanation.

[Fast400]

I hit 234F today...according to obd. Should I be worried?

[HighlandPete]

Originally Posted by Fast400

I hit 234F today...according to obd. Should I be worried?

BMW Data for typical N55 Engine Cooling

The engine control unit regulates the following temperature ranges:
• 108°C/226°F = Economy mode
• 104°C/219°F = Normal mode
• 95°C/203°F = High mode
• 90°C/194°F = High mode and control with characteristic map thermostat


System Protection
If the coolant or the engine oil overheat during operation, certain vehicle functions are influenced to the effect that more energy is available to the engine cooling system.

These measures are divided over two operating modes:

• Component protection
- Coolant temperature between 117°C/242°F and 124°C/255°F
- Engine oil temperature between 150°C/300°F and 157°C/314°F
- Result: The output of the air conditioning system
(up to 100%) and of the engine is reduced

• Emergency
- Coolant temperature between 125°C/257°F and 129°C/264°F
- Engine oil temperature between 158°C/316°F and 163°C/325°F
- Result: The power output of the engine is reduced
(up to 90%)

As you can see, 234F for engine coolant is still below any protection thresholds.

HighlandPete

[BavarianFanatic]

Originally Posted by E90Fleet

The ECU modes are not linked to the modes you can select for the gearbox and suspension.

The ECU modes are ECO,Normal,High and High+.

The ECU automatically determines which mode to go into depending on driving conditions.
The driver cannot select the modes.

This is not correct. The opposite is true.

[tekzhicuh]

Its one of the reasons BMW dont show coolant temp anymore to regualr drivers

[Fast400]

Originally Posted by HighlandPete

BMW Data for typical N55 Engine Cooling

The engine control unit regulates the following temperature ranges:
• 108°C/226°F = Economy mode
• 104°C/219°F = Normal mode
• 95°C/203°F = High mode
• 90°C/194°F = High mode and control with characteristic map thermostat


System Protection
If the coolant or the engine oil overheat during operation, certain vehicle functions are influenced to the effect that more energy is available to the engine cooling system.

These measures are divided over two operating modes:

• Component protection
- Coolant temperature between 117°C/242°F and 124°C/255°F
- Engine oil temperature between 150°C/300°F and 157°C/314°F
- Result: The output of the air conditioning system
(up to 100%) and of the engine is reduced

• Emergency
- Coolant temperature between 125°C/257°F and 129°C/264°F
- Engine oil temperature between 158°C/316°F and 163°C/325°F
- Result: The power output of the engine is reduced
(up to 90%)

As you can see, 234F for engine coolant is still below any protection thresholds.

HighlandPete

Great info! Thanks Pete
It's still a weird feeling coming from vehicles that ran 200F tops. All in the name of fuel economy I guess.

[RootCanal05]

I have a 2015 335 6 MT w/ M PPK and I noticed it was running just under 250*F. I was highway cruising at ~70mph, in sport mode, it was 72* outside, low humidity, cruise control was on, AC set at 68*. I didn't notice any reduction in power or quality of the AC. It ran at that temp for 3/4 of the trip then it went down to the usual ~220. It did concern me since I never saw the temp gauge go over the 220 mark even on 90* humid days. The SA stuttered through an answer when I questioned him about it. Then he ends with "it's normal." I hope he's right.

[HighlandPete]

Originally Posted by RootCanal05

I have a 2015 335 6 MT w/ M PPK and I noticed it was running just under 250*F. I was highway cruising at ~70mph, in sport mode, it was 72* outside, low humidity, cruise control was on, AC set at 68*. I didn't notice any reduction in power or quality of the AC. It ran at that temp for 3/4 of the trip then it went down to the usual ~220. It did concern me since I never saw the temp gauge go over the 220 mark even on 90* humid days. The SA stuttered through an answer when I questioned him about it. Then he ends with "it's normal." I hope he's right.

Are you referring to the temperature gauge... reading oil temperature, not the hidden menu and reading ECT? If so, then you are in the normal range at 250F. Gauge is only at mid position, isn't it?

HighlandPete

[Buckeyes]

Originally Posted by RootCanal05

I have a 2015 335 6 MT w/ M PPK and I noticed it was running just under 250*F. I was highway cruising at ~70mph, in sport mode, it was 72* outside, low humidity, cruise control was on, AC set at 68*. I didn't notice any reduction in power or quality of the AC. It ran at that temp for 3/4 of the trip then it went down to the usual ~220. It did concern me since I never saw the temp gauge go over the 220 mark even on 90* humid days. The SA stuttered through an answer when I questioned him about it. Then he ends with "it's normal." I hope he's right.

Are you talking coolant temp or oil temp. Either way, they both run high and its normal.