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      03-01-2013, 05:50 PM   #1
Dragon88
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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, 08:43 AM   #2
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Seems high, I've never seen mine much over 90, usually runs about 86 I think
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      03-02-2013, 11:44 AM   #3
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I thought petrols run slightly higher coolant temps than diesels?
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      03-02-2013, 01:05 PM   #4
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Quote:
Originally Posted by ssc330d View Post
I thought petrols run slightly higher coolant temps than diesels?
You may be right, I've never really thought about it
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      03-02-2013, 06:01 PM   #5
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Quote:
Originally Posted by Dragon88 View Post
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.

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Last edited by HighlandPete; 03-02-2013 at 06:08 PM.
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      03-02-2013, 06:41 PM   #6
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Cheers for the feedback, I assumed thermostats would open around 90c for all vehicles!
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      03-02-2013, 09:44 PM   #7
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Is 84c for a 335D low enough to worry about to replace a stat?
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      03-03-2013, 03:37 AM   #8
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Quote:
Originally Posted by mob17 View Post
Is 84c for a 335D low enough to worry about to replace a stat?

No, we've been here before. Totally fine.
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      03-03-2013, 08:05 AM   #9
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No, we've been here before. Totally fine.
Lol ok thanks again!
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      03-07-2013, 05:08 PM   #10
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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, 02:32 AM   #11
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Yes.

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      03-08-2013, 03:17 AM   #12
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Quote:
Originally Posted by Dragon88 View Post
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.
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      03-08-2013, 03:31 AM   #13
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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.
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      03-08-2013, 07:16 AM   #14
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sounds good to me. After changing mine it goes from 90-99. so looks fine.
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      03-08-2013, 02:23 PM   #15
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Quote:
Originally Posted by Dr Dave View Post
Yes.

123456789
My main thermostat is being replaced under warranty as they said it takes too long to get up and running
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