Coolant Temperature 98-102?

Dragon88 · 03-01-2013, 04:50 PM

After reading about failing thermostats, I decided to turn on my coolant temperature reading (hidden menu 7.00) before driving home tonight.

It reached 102C after a few minutes of 80MPH Motorway driving, and dropped down to 97-98C when driving along small 40MPH roads.

This seems very high, is it a sign of a sticking (closed) thermostat? I don't get any engine or coolant warning lights though.

Could it be doing much damage to my engine?

IanS100 · 03-02-2013, 07:43 AM

Seems high, I've never seen mine much over 90, usually runs about 86 I think

ssc330d · 03-02-2013, 10:44 AM

I thought petrols run slightly higher coolant temps than diesels?

IanS100 · 03-02-2013, 12:05 PM

Quote:

Originally Posted by ssc330d

I thought petrols run slightly higher coolant temps than diesels?

You may be right, I've never really thought about it

HighlandPete · 03-02-2013, 05:01 PM

Quote:

Originally Posted by Dragon88

After reading about failing thermostats, I decided to turn on my coolant temperature reading (hidden menu 7.00) before driving home tonight.

It reached 102C after a few minutes of 80MPH Motorway driving, and dropped down to 97-98C when driving along small 40MPH roads.

This seems very high, is it a sign of a sticking (closed) thermostat? I don't get any engine or coolant warning lights though.

Could it be doing much damage to my engine?

Sounds good to me, seeing ~100C, petrol runs hotter than diesel. Nothing to worry about.

Depending on engine, I understand the thermostat opening temperature is 97C.

HighlandPete

Dragon88 · 03-02-2013, 05:41 PM

Cheers for the feedback, I assumed thermostats would open around 90c for all vehicles!

mob17 · 03-02-2013, 08:44 PM

Is 84c for a 335D low enough to worry about to replace a stat?

Dr Dave · 03-03-2013, 02:37 AM

Quote:

Originally Posted by mob17

Is 84c for a 335D low enough to worry about to replace a stat?

No, we've been here before. Totally fine.

mob17 · 03-03-2013, 07:05 AM

Quote:

Originally Posted by Dr Dave

No, we've been here before. Totally fine.

Lol ok thanks again!

mob17 · 03-07-2013, 04:08 PM

I've just noticed something re the coolant temp which might be just the way it works.

Went on a long run and it stuck to 86c. Just for fun i stuck it on cruise and lowered the gear until it was reving at around 3.5k. The temp immediately dropped to around 81. As soon as i returned to 6th gear it went back up to 86c. Also when i parked up on my drive for a few mins it went up to 96c and then when i drove off it went back down to 86c. Is this normal?

Dr Dave · 03-08-2013, 01:32 AM

Yes.

123456789

Jules59 · 03-08-2013, 02:17 AM

Quote:

Originally Posted by Dragon88

After reading about failing thermostats, I decided to turn on my coolant temperature reading (hidden menu 7.00) before driving home tonight.

It reached 102C after a few minutes of 80MPH Motorway driving, and dropped down to 97-98C when driving along small 40MPH roads.

This seems very high, is it a sign of a sticking (closed) thermostat? I don't get any engine or coolant warning lights though.

Could it be doing much damage to my engine?

Is it remapped?

My diesel gets to 102C if thrashed. But runs normally around 96C.

M3E46M · 03-08-2013, 02:31 AM

this is normal look at this post http://www.e90post.com/forums/showthread.php?t=412156

if you get to 117 then thats high. Scroll down to Water Temp chart.

Iyrix · 03-08-2013, 06:16 AM

sounds good to me. After changing mine it goes from 90-99. so looks fine.

mob17 · 03-08-2013, 01:23 PM

Quote:

Originally Posted by Dr Dave

Yes.

123456789

My main thermostat is being replaced under warranty as they said it takes too long to get up and running

03-01-2013, 04:50 PM	#1
Dragon88 Private First Class 6 Rep 161 Posts Drives: BMW E92 320i M-Sport Join Date: Jun 2012 Location: West London iTrader: (0)	Coolant Temperature 98-102? After reading about failing thermostats, I decided to turn on my coolant temperature reading (hidden menu 7.00) before driving home tonight. It reached 102C after a few minutes of 80MPH Motorway driving, and dropped down to 97-98C when driving along small 40MPH roads. This seems very high, is it a sign of a sticking (closed) thermostat? I don't get any engine or coolant warning lights though. Could it be doing much damage to my engine?
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03-02-2013, 07:43 AM	#2
IanS100 Major General 135 Rep 5,050 Posts Drives: 520d F10 LCI M Sport Join Date: Nov 2011 Location: Southport UK iTrader: (0)	Seems high, I've never seen mine much over 90, usually runs about 86 I think
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03-02-2013, 10:44 AM	#3
ssc330d Second Lieutenant 17 Rep 200 Posts Drives: Le Mans Blue 330d M Sport Join Date: Mar 2012 Location: Co. Durham. England. iTrader: (0) Garage List 2006 330d M Sport [10.00]	I thought petrols run slightly higher coolant temps than diesels? __________________
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03-02-2013, 05:41 PM	#6
Dragon88 Private First Class 6 Rep 161 Posts Drives: BMW E92 320i M-Sport Join Date: Jun 2012 Location: West London iTrader: (0)	Cheers for the feedback, I assumed thermostats would open around 90c for all vehicles!
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03-02-2013, 08:44 PM	#7
mob17 Major General 397 Rep 5,613 Posts Drives: E92 335D Join Date: Mar 2012 Location: East Midlands, UK iTrader: (5)	Is 84c for a 335D low enough to worry about to replace a stat?
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03-07-2013, 04:08 PM	#10
mob17 Major General 397 Rep 5,613 Posts Drives: E92 335D Join Date: Mar 2012 Location: East Midlands, UK iTrader: (5)	I've just noticed something re the coolant temp which might be just the way it works. Went on a long run and it stuck to 86c. Just for fun i stuck it on cruise and lowered the gear until it was reving at around 3.5k. The temp immediately dropped to around 81. As soon as i returned to 6th gear it went back up to 86c. Also when i parked up on my drive for a few mins it went up to 96c and then when i drove off it went back down to 86c. Is this normal?
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03-08-2013, 01:32 AM	#11
Dr Dave Zummerzet Zyder Drinker! 114 Rep 5,541 Posts Drives: '06 330D Le Mans Blue Join Date: May 2009 Location: Somerset iTrader: (3) Garage List 2006 330d M Sport [0.00]	Yes. 123456789 __________________
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03-08-2013, 02:31 AM	#13
M3E46M First Lieutenant 53 Rep 328 Posts Drives: 2008 BMW 335i E92 6 MT Join Date: Jun 2009 Location: Somewhere on Planet Earth for now. iTrader: (2)	this is normal look at this post http://www.e90post.com/forums/showthread.php?t=412156 if you get to 117 then thats high. Scroll down to Water Temp chart. __________________ .../// TURBO! Why in the world would you choose anything else?... ///
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03-08-2013, 06:16 AM	#14
Iyrix Lieutenant 101 Rep 472 Posts Drives: F30 330d & 335i Join Date: Feb 2013 Location: UK iTrader: (0)	sounds good to me. After changing mine it goes from 90-99. so looks fine.
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