Outside temperature reading - Mercedes-Benz Forum

 
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post #1 of 9 (permalink) Old 11-22-2006, 08:48 AM Thread Starter
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Question Outside temperature reading

Hello friends,

Yesterday morning when starting the car, I noticed that the outside temperature indicator was about right at 45 degrees F. I drove about 1 minute, stopped at a place for about 1-2 minutes, turning the car off.

When I re-started, the temperature reading was somewhere in the 60s! As I was driving, it gradually adjusted back down, 1 degree at a time, until it was "correct" again. It continued to function normally for the next 50 highway miles.

I was on my in for service at the time, so mentioned it to the service writer. The tech came out later for a further explanation and I gave it to him. He gave it a road test and could not make it happen. He also said the incident did not leave an error code, and started talking about how difficult intermittant problems usually are to diagnose and fix.

We agreed that the "worst case scenario" was probably replacing the sensor. In the mean time, I'm supposed to be watching for it to happen again, and that maybe it will leave a code eventually.

Does anyone have any ideas, or do you think this is just another one of the often-mentioned Mercedes gremlins?

Thanks in advance,
Musikmann

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Last edited by Musikmann; 11-22-2006 at 08:52 AM.
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post #2 of 9 (permalink) Old 11-22-2006, 09:02 AM
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The sensor is mounted in front bumper. Very likely when you stopped with hot engine, you had a breeze, that pushed hot air from engine compartment up front. It doesn't happen all the time, but it occasionally it might. Get infra-red thermometer and check the bumper temperature if you are that curious.
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post #3 of 9 (permalink) Old 11-22-2006, 10:11 AM
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I wouldn't worry about it too much. I notice the opposite all the time. When it gets wet, it reads too low for a while.

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post #4 of 9 (permalink) Old 11-22-2006, 11:11 AM
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I have had this happen in the winter months when the air temp is cold and the engine is hot and the car stationary. I get a higher reading than I should sometimes. Once moving it seems to settle back to normal.
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post #5 of 9 (permalink) Old 11-22-2006, 01:02 PM
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Quote:
Originally Posted by Musikmann
Does anyone have any ideas, or do you think this is just another one of the often-mentioned Mercedes gremlins?

Thanks in advance,
Musikmann
Well, was that your SAT or TAT reading? And was your engine anti-ice on at the time?

Oh, sorry, forgot we're talking about cars here.

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post #6 of 9 (permalink) Old 11-22-2006, 03:03 PM
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yes, definitely not something to worry about. The sensor most probably had the hot air of the engine to deal with.... and shows a much higher temperature. Had the thing showing temperatures of over 130 F when parked outside in our hot Californian summer. Usually in heavy traffic the reading is higher than usual (MB engines run pretty hot).

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post #7 of 9 (permalink) Old 11-22-2006, 03:57 PM
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Previous answers are most likely correct.

I am more interested in the interior temperature than the exterior.

I know what I have set my climate controls to. But what I do not know is what the temperature actually is. I suppose I could hang a thermometer somewhere....
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post #8 of 9 (permalink) Old 11-22-2006, 07:48 PM Thread Starter
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Thumbs up Thanks to all

I appreciate the feedback guys, but just as a final note: I'm not that concerned that the thing is even that accurate, +/- 5, or even 10, degrees is close enough for me, it just bothers me when anything in Benzie has a glitch

Again, thanks to everyone who responded,

Musikmann

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post #9 of 9 (permalink) Old 11-22-2006, 11:38 PM
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Quote:
Originally Posted by keyhole
Previous answers are most likely correct.

I am more interested in the interior temperature than the exterior.

I know what I have set my climate controls to. But what I do not know is what the temperature actually is. I suppose I could hang a thermometer somewhere....
The car would normally have multiple interior temperature sensors. Diagnostics would even allow reading those. But the readings would be confusing for an ordinary driver because you want the temperature to feel good and that does not mean a fixed centigrade value. Instead depending on the air humidity, sun shine strength and direction, fan setting (air flow level) etc. the car needs to adjust the actual A/C air temperature to reach conditions that feel OK for the driver (why not for co-passengers too).
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