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      11-23-2012, 09:13 AM   #1
Missy101
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Drives: 130i
Join Date: Nov 2012
Location: FIFE

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130i 128i Coolant/engine temps N52

Hi all
New to this site but really enjoying all the informative threads.
Wonderd if maybe a few people with 130i or 128i n52 engines would mind helping messure average coolant temps and cooling trends the n52 seems to have.

If a handfull of people help and log on this thread what they find this should help us all know if our cars/engines are running as they should, also could help detect failing hardware before it damages your engine.

With most models the obd secret menu will need to be accessed to messure your coolant temp.

This is especially important if you N52 fan is running at full speed when you park your car up at the end of a trip.

The following should be a good help.


To access the hidden menu do the following.
Put key into car but dont hit any pedals of start.
Hold reset for ten seconds (on cluster next to speedo)
once into menu your vin will be displayed vn12345 (simply add you vin together ie 1+2+3+4+5=15) make a mental note of your answer.
Hold reset for another 3 seconds until 01.__ is displayed
Now press reset 19 times until onto menu 19
once on 19 "lock on" is displayed and then "00" when you see 00 quickly press reset the number of times your vin adds too, ie 15 for me.
display should read "lock on 15" then will disapear back to 01.00.
hold down reset for another 3 seconds until 01.-- is displayed then press reset 7 times to goto menu 7
Once in menu 7 your real time coolant temps are displayed.
Start your car (note turn off the car will un do the above)

1. Average temp in town (stop/start driving)
2. Average for motorway cruise at say 70-80mph
3. What happens when you floor the loud pedal
4. Does you fan run when your park on drive at end of trip
5. If fan is running is it loud
6. Whats your ambient external temps

My temps are
1. 99c
2. 102-103c
3. Temp drops to 96c then returns to 102c on motorway
4. Yes, full speed sometimes
5. Yes very loud
6. 6c outside temp

Thanks for reading

Last edited by Missy101; 11-23-2012 at 09:21 AM.