Member
when i start my z3 1.9 the temp start cold until i drive little then stay in the middle for all the trip. Screenshot 2024-03-15 202730.png.
my friend have anther z3 1.9 but his temp go down sometimes after driving ,,,,which one is normal?
Thin Air
It is normal for it to stay in the middle unless something unusual is going on. It is controlled by the computer, so it doesn't really move much, if any for normal variations of the temperature.
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Is Enabled
BMW Tech Expert
It should not really go down while driving. Your friend should investigate that.
-Abel
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Member
Might have a stuck open thermostat?Originally Posted by 328 Power 04
Member
If you're worried, just get an ODBII reader and log water temps and other engine metrics.
Tony
"You can't sign away negligence."
Member
100%, my understanding they usually fail stuck open. I had this same realization wondering what was going on with mine. Noticed in the highway it was at 1/4 and sometimes took forever or never to get up to temp/halfway mark. Ended up replacing the water pump, thermostat, sensor. After flushing the coolant and replacing a few hoses for good measure it gets to the middle in about 2 blocks and stays there.
Sim Simma
Moderator
If it's moving below TDC during operation, especially if it drops there after it's already warmed up, it is a faulty thermostat
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