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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > 2012-2019 BMW 3 and 4-Series Forums > General F30 Sedan / F32 Coupe / F36 Gran Coupe Forum > Heat from the ground (temp sensor)
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      11-21-2015, 04:14 AM   #1
Nomana
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Hi
I have no idea why f32 outside temp sensor is located very near to the ground since f82 one is behind the center grille.

My sensor always read ambient temp higher than it should be (some time much higher).

When i was outside with my jeans, I can felt the heat on the surface of the roads which transfer to my knee while ambient air was not that hot. So i think this can be one of the reasons.

I'm frustrated about the things that need outside temperature to operate.
Start/stop feature never work when I need it. Outside ~30c (used thermometers to test) but my car read 35.5c.

As you could guess, SA said it's normal. I can live with it but not so well. Thinking to try to relocate it to where m4 one are, might be better.

Cheers
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      11-21-2015, 10:51 AM   #2
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Any car with a temp gauge will give the most accurate reading when the car is in motion. If you move it up, it's still going to be closer to the engine. Or the hood, which gets pretty hot too.
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      11-21-2015, 11:50 AM   #3
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Not a problem we have in the uk.
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      11-21-2015, 11:54 AM   #4
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Thank you guys
All you guys said make sense and yeah here is hot.
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      11-21-2015, 03:33 PM   #5
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I've typically found that bmw's temp sensor is more accurate that other manufacturers. Mind you we really don't hit the 35+ C range in Canada.

It is accurate at -35 though lol
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      11-21-2015, 04:49 PM   #6
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Like most car's temp sensors I've found the one in the F30 does give slightly inflated temps when driving in traffic in warm weather. There will always be more heat coming off the pavement, other cars, etc in those situations that will give inaccurate readings (i.e. I've seen +39C when the actual temp was closer to +35C on a hot summer day).
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      11-22-2015, 02:08 PM   #7
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I've typically found that bmw's temp sensor is more accurate that other manufacturers. Mind you we really don't hit the 35+ C range in Canada.

It is accurate at -35 though lol
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      11-22-2015, 02:37 PM   #8
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In winter climates you want it closer to the road bed so you have an early warning of the potential for icing. When the ground is frozen the surface can be quite a bit colder than ambient air. The only downside is slightly elevated temps when it's hot though the impact should be minimal when you're under way.
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      11-22-2015, 03:29 PM   #9
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Quote:
Originally Posted by BavarianFanatic View Post
In winter climates you want it closer to the road bed so you have an early warning of the potential for icing. When the ground is frozen the surface can be quite a bit colder than ambient air. The only downside is slightly elevated temps when it's hot though the impact should be minimal when you're under way.
Totally agree on the winter driving, was going to post something similar before reading your post.

I want the reading to be as accurate as possible in the most critical range, where we need to know the temperature for safe driving. I drive in that critical range, +/- freezing temperatures and where road signs display "roads liable to icing" in winter time. To have an accurate display AND the temperature 'bong' give an audible warning, help road awareness and driving safety.

I've always found the reading to be very close to reality in that critical range.

HighlandPete
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      11-22-2015, 10:01 PM   #10
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I can say that in then Sonoran desert of Arizona, the F30 always reads a little high compared to the temperatures around me. If it is 105 it might read 108. For what it's worth, our last car was a Lexus and it was right on.

Doesn't really make much difference, just something I noticed.
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      11-23-2015, 08:32 AM   #11
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When you think about it, the thing I use the temp sensor the most for, is to check that I'm operating my tires in the correct temp range, so it makes sense to get the temp closer to the road....
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