Join Date: Sep 2008
Location: Honolulu, HI, USA
Perhaps there's another way.
Various BMW car models buffer the visible engine coolant temp gage, in particular my E46 2002 325xi. I'm told that other manufacturers including Mercedes and Mazda do the same. As long as the sensed temp is within a 130-220 degrees Fahrenheit, the gage needle will stay straight up. Problem with this is that if you engine starts to overheat, you don't know it until it's REALLY HOT, and have very little time (sometimes no time at all) before damage is done to the aluminum head and aluminum block. If that occurs, you're looking for a new engine.
The workaround is to access the coding in the ECU and modify one line of code, which on various forums is well known. It's risky (IMHO) to access the basic code of the ECU, and I'm nobody's software engineer, so I haven't done it. A local indie refused to do it, and I've let it lie for now.
Though my daughter had an overheat experience, fortunately no damage seems to have been done. I got that car for $500 anyway, so if it breaks, coast to the side of the road and call Uber.
Some creative searching should bring up several threads in which this has been discussed, and at this point I leave it up to you!
Last edited by Honolulu; Jul 20th, 2019 at 12:28 am.