I’m new here and hope someone has some ideas for me. Please forgive if this has already been discussed. I’ve done a search and didn’t find anything.
I have a 2006 Z4 and am having a problem with the temperature appearing to run hot. As far as I can remember, the gauge has always stayed at the 12:00 position. But for the past year, the gauge has been acting wonky by rising to the 1:00 position, then bouncing back to 12, then inching up to 2:00. As y’all know, at about the 2:15 position is the red zone.
It has not yet reached the red zone. But I drive around in terror of it doing so. This ONLY happens when the weather temperature is 92 degrees (Fahrenheit, because I’m in the US) and over, which is frequently in Texas.
There is a back story to this, but I don’t know if it’s relevant. But I’ve tried all kinds of things to resolve this issue. Our local BMW dealer is not very good. What they told me to do has not resolved the issue. Here’s what’s been done so far:
Replaced coolant cap
Replaced valve cover gasket
Replaced expansion tank and automatic trans cooler thermostat
Replaced coolant pump, thermostat, several coolant hoses
Sensors in the coolant system, which names I don’t know, have been replaced.
Any ideas? Is more info needed?
