Temperature gauge/Speedometer

[Campelo]

Hello all from Spain,

I have a 325i and I've some doubts regarding my temperature gauge. The needle stays just above the blue mark as you can see in the picture.
With a laser thermometer I measured the temperature in the hose between the engine and the radiator and I got 80C (this means that the thermostat is open and shouldn't be...) Am I right?? Is the temperature gauge working good?

103f9907-d480-4cea-b1ad-3629f1e563d2.jpg

Also a problem with the speedometer and the km count...It doesn't work. I only replaced the fuse 12. Should I replace the sensor placed in the differential?

Thanks in advance to all of you.

[BenHar]

For the speedometer, check the wires coming from the sensor on the differential. They often fail due to work hardening of the copper. Replace the last 30cm or so.

Ben

[Campelo]

Thanks Ben! I'll do it! For the temperature gauge? Any idea? I think I should replace the thermostat but, with a temp of 80C, should the needle be on this position?

[Brianmoooore]

Replace the thermostat before checking any further with the temp. gauge. The needle should be a little higher on the gauge with the correct 'stat, but there's no common electrical faults that make it read slightly low.

[Campelo]

Thanks Brian! I'll do that!

[Contours]

The temp gauge on my 316 also just goes slightly over the blue mark and I have never had any cooling issues. The car also heats up within a couple of miles so if there is a problem with the actual gauge reading I don't intend to fix it.