Just found this little gem over at bimmerforums, from geargrinder...

Cluster overtemperature alarm tweak:

In addition the alarm temperature for the dash can be recoded fairly easily. Factory options are 125C (I6's mostly) or 130C (the V8's) - the default 130C temperature for the V8's is certainly very high, and many of us would prefer to have been warned long before it gets to that point.

Mechanics of coding:

All coding for the alert is in the LCM (I know seems weird but LCM controls sending alert messages to the cluster).

In this case it's a bit more involved you need to tweak a couple things to enable the custom alert value to work for some reason... but this is easily accomplished w/ NCS Expert & NCS Dummy.

1. Change the TWO values (aka there are 2 different ones w same name) for KUEHLMITTLETEMP to 'melden' aka reported.

2. Ensure KUEHLMITTELUEBERTEMP_CAN is set to 'nicht activ'.

3. Then edit the value for MOTOR_UEBERTEMP to the temperature you want to be alerted for. Factory options are 125C (I6's mostly) or 130C (the V8's) so V8's can lower the temperature by 5C without any custom parameter work. In order to get anything more than that, a custom parameter value needs to be added however. Convert your desired temperature to a hex value then add that as a parameter value option... And if any of that is confusing... see disclaimer.

OEM MAP Thermostat:

While getting sooner notice is probably a really good idea, with a factory T-stat you prob don't want below 115C or it will 'false alarm' frequently during non-crisis events. Given the AC is fully cut out by the DME at 120C one might think you'd like to know at or around that temperature for instance, so something around 115-120C is probably a decent value for a stock car. Possible hex values you might like to choose below.

115C = 0x73
117C = 0x75
120C = 0x78

88C BMW Diesel Thermostat:

For an 88C T-stat, I found 105C to be a bit too low, and on hot slow traffic AC days I'd get the alarm and despite knowing in my mind "well it should still be fine according to the gauge..." it could be a bit nerve wracking... 115C seems to be a good compromise, and I know I'll get the alarm still before the AC starts to kick out. Anything 110-115C is probably good for these cars.

110C = 0x6E
112C = 0x70
115C = 0x73

Here: - https://www.bimmerforums.com/forum/s...dle-and-alarms

__________________
Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)