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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 09-10-2013, 10:00 AM
jackievietnam jackievietnam is offline
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Help coolant temp !! 2006 bmw 325i

I have 2006 325i, my coolant temp from hidden menu reading is 74-84 Celsius in city and high way reading 99-101. is this normal? can any telling what's wrong? thank you.
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  #2  
Old 09-10-2013, 10:03 AM
jburke4689 jburke4689 is offline
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I would expect you have a bad thermostat. Temp should be relatively constant once warmed up. 99-101C is no problem.
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  #3  
Old 09-10-2013, 10:33 AM
jackievietnam jackievietnam is offline
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thank you jburke4689!! I also noted when i turn on the heater the coolant fan go on and non-stop (over night start up), the engine seem hotter than normal after 10 miles, is this related to thermostat problem too?
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  #4  
Old 09-10-2013, 10:56 AM
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floydarogers floydarogers is offline
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I hate to disagree with people, but JBurke is wrong on this one.

Even on the E46 models, the electrically-controlled (by the ECU) thermostat varied engine temps quite a bit. The addition of the electric water pump accentuates these variations. The different temperatures are due to the ECU trying to run the car most efficiently. On the highway with lots of airflow, it can run the engine much closer to the red-zone; this allows better fuel efficiency. In city/slower traffic, more reserve cool coolant is needed if the a/c comes on, or if you stop for a light, etc.

Those temperatures are as expected, and there is nothing wrong with the engine and it's cooling system. Remember, turning on the heater usually turns on the a/c, which runs the cooling fan, which can result in lower temps.

This large variation in coolant temperatures is one reason that BMW took away the temperature gauge - in the E46 it was a "cold", "operating temp" and "overheat" gauge. Variations scare people!
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  #5  
Old 09-10-2013, 12:40 PM
jburke4689 jburke4689 is offline
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floyd may be right. I based my assumption on the N54 engine even though I know the 325i doesn't have the N54. This is right out of the book. 74-84 Celcius seems very low under any condition.

The software in the engine control unit now features a calculation model that can take
into account the development of the cylinder head temperature based on load.
In addition to the characteristic map control of the thermostat, the heat management
system makes it possible to use various maps for the purpose of controlling the coolant
pump. For instance, the engine control unit can adapt the engine temperature to match
the current operating situation.
This means that four different temperature ranges can be implemented:
108C ECO mode
104C Normal mode
95C High mode
90C High + map-thermostat mode
The control system aims to set a higher cylinder-head temperature (108C) if the engine
control unit determines ECO (economy) mode based on the engine performance.
The engine is operated with relatively low fuel consumption in this temperature range as
the internal friction is reduced.
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Old 09-10-2013, 01:49 PM
fdriller9 fdriller9 is offline
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Quote:
Originally Posted by floydarogers View Post
I hate to disagree with people, but JBurke is wrong on this one.

Even on the E46 models, the electrically-controlled (by the ECU) thermostat varied engine temps quite a bit. The addition of the electric water pump accentuates these variations. The different temperatures are due to the ECU trying to run the car most efficiently. On the highway with lots of airflow, it can run the engine much closer to the red-zone; this allows better fuel efficiency. In city/slower traffic, more reserve cool coolant is needed if the a/c comes on, or if you stop for a light, etc.

Those temperatures are as expected, and there is nothing wrong with the engine and it's cooling system. Remember, turning on the heater usually turns on the a/c, which runs the cooling fan, which can result in lower temps.

This large variation in coolant temperatures is one reason that BMW took away the temperature gauge - in the E46 it was a "cold", "operating temp" and "overheat" gauge. Variations scare people!
The tstat is not electronically controlled. It's activated by thermal load.
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Old 09-10-2013, 02:06 PM
ptrcd003 ptrcd003 is offline
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Quote:
Originally Posted by fdriller9 View Post
The tstat is not electronically controlled. It's activated by thermal load.
Where are you getting this information from?
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Old 09-10-2013, 02:09 PM
fdriller9 fdriller9 is offline
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Quote:
Originally Posted by ptrcd003 View Post
Where are you getting this information from?
My head....

The water pump in late model BMWs are now electronically operated. But the tstat is still operated by thermal load. When coolant reaches the specified temperature, the valve inside the tstat opens.

To further prove my point. There is no electrical connection on the tstat. Only 2 hoses. One in, one out.
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Old 09-10-2013, 02:11 PM
fdriller9 fdriller9 is offline
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The DME will vary the pumps flow rate, that's how it controls engine temperature.
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Old 09-10-2013, 02:21 PM
fdriller9 fdriller9 is offline
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Also the tstat is design to fail in the open position. So this may be why your car's temps are low.
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  #11  
Old 09-10-2013, 03:08 PM
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floydarogers floydarogers is offline
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Quote:
Originally Posted by fdriller9 View Post
My head....

The water pump in late model BMWs are now electronically operated. But the tstat is still operated by thermal load. When coolant reaches the specified temperature, the valve inside the tstat opens.

To further prove my point. There is no electrical connection on the tstat. Only 2 hoses. One in, one out.
http://www.realoem.com/bmw/showparts...54&hg=11&fg=35

Sorry, there *IS* an electrical connection.
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  #12  
Old 09-11-2013, 07:43 AM
fdriller9 fdriller9 is offline
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That's odd. My Tstat looks nothing like that. I have an n52b30 engine. I changed my pump and Tstat about a year ago with oem parts. Did it myself so I know what was disconnected/connected.
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