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      04-16-2015, 06:11 PM   #1
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Engine coolant Temp?

Anyone know what the engine coolant temp normal operating range is? My 335i runs about 225 F.
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      04-16-2015, 06:25 PM   #2
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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.)
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      04-16-2015, 06:27 PM   #3
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Quote:
Originally Posted by COKen View Post
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.
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      04-16-2015, 06:36 PM   #4
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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)
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      04-16-2015, 06:37 PM   #5
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I believe the thermostat opens at 105C, so coolant temp should be in the 221F area.
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      04-16-2015, 06:38 PM   #6
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Quote:
Originally Posted by Mike_L View Post
I believe the thermostat opens at 105C, so coolant temp should be in the 221F area.
Nope. MAP controlled
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      04-16-2015, 07:18 PM   #7
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Thanks for the info
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      04-16-2015, 09:10 PM   #8
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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.
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      04-16-2015, 09:20 PM   #9
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Quote:
Originally Posted by Billfitz View Post
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.
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      04-16-2015, 09:37 PM   #10
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Quote:
Originally Posted by Mike_L View Post
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.
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      04-17-2015, 05:56 AM   #11
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Quote:
Originally Posted by E90Fleet View Post
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)
Quote:
Originally Posted by newwaysys View Post
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.

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      04-17-2015, 11:53 PM   #12
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Quote:
Originally Posted by newwaysys View Post
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.
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      04-18-2015, 04:40 AM   #13
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Quote:
Originally Posted by Kev314 View Post
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.
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      04-18-2015, 08:05 AM   #14
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Quote:
Originally Posted by E90Fleet View Post
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.
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      05-13-2015, 01:26 PM   #15
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I hit 234F today...according to obd. Should I be worried?
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      05-13-2015, 02:29 PM   #16
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Quote:
Originally Posted by Fast400 View Post
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:
108C/226F = Economy mode
104C/219F = Normal mode
95C/203F = High mode
90C/194F = 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 117C/242F and 124C/255F
- Engine oil temperature between 150C/300F and 157C/314F
- Result: The output of the air conditioning system
(up to 100%) and of the engine is reduced

Emergency
- Coolant temperature between 125C/257F and 129C/264F
- Engine oil temperature between 158C/316F and 163C/325F
- 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
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      05-13-2015, 07:47 PM   #17
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Quote:
Originally Posted by E90Fleet View Post
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.
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      05-14-2015, 12:59 AM   #18
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Its one of the reasons BMW dont show coolant temp anymore to regualr drivers
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      05-14-2015, 02:55 AM   #19
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Quote:
Originally Posted by HighlandPete View Post
BMW Data for typical N55 Engine Cooling

The engine control unit regulates the following temperature ranges:
108C/226F = Economy mode
104C/219F = Normal mode
95C/203F = High mode
90C/194F = 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 117C/242F and 124C/255F
- Engine oil temperature between 150C/300F and 157C/314F
- Result: The output of the air conditioning system
(up to 100%) and of the engine is reduced

Emergency
- Coolant temperature between 125C/257F and 129C/264F
- Engine oil temperature between 158C/316F and 163C/325F
- 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.
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      05-31-2015, 02:45 PM   #20
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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.
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      05-31-2015, 02:58 PM   #21
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Quote:
Originally Posted by RootCanal05 View Post
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?

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      05-31-2015, 03:05 PM   #22
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Quote:
Originally Posted by RootCanal05 View Post
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.
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