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Forum LockedAmbient Temp Sensor +8 degrees

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long_w8 View Drop Down
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  Quote long_w8 Quote  Post ReplyReply Direct Link To This Post Topic: Ambient Temp Sensor +8 degrees
    Posted: 08-Jun-2011 at 04:15
Hi all,

This is now the second one of these cars I've owned (2003 W8 Variant) and both have the exact same, minor-but-annoying problem: The external temp is always around 6-8 degrees (F) too hot.

I see that replacement temp sensor modules are only around $10, and it's real easy to replace...so, my questions are:

1) Does anyone have one of these cars that DOESN'T read too hot?
2) Does replacing the module help, or are they all wrong by the same amount?

and for the true geeks out there...

3) Anyone tried putting a small resistor in-line to fix the error? :-)

I'll be very interested to see what others say on this topic...

Thanks!

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Malcolm Tucker View Drop Down
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  Quote Malcolm Tucker Quote  Post ReplyReply Direct Link To This Post Posted: 08-Jun-2011 at 10:03
I think you'll find the reason the sensor reports a higher temperature than ambient is that it's quite close to the radiator and while that's fine when you have a tiny diesel engine, a 4L petrol engine in the same space radiates quite a bit more heat.
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  Quote fitzski Quote  Post ReplyReply Direct Link To This Post Posted: 08-Jun-2011 at 16:43
Haven't noticed it on mine (the W8, or in my tiny diesel engined Jetta!). Yes, it will read high when starting up after being parked on black tarmac in the sun, but after a few kms of driving (~5), it normalizes. And yes, in the W8, stuck in stop-and-go on a hot day, radiant heat will bring it up as well.

I suppose you could put a bit of a heatshield around the sensor, or could also fairly easily relocate it if you cared that much.
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long_w8 View Drop Down
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  Quote long_w8 Quote  Post ReplyReply Direct Link To This Post Posted: 08-Jun-2011 at 23:34
Mine was reading 101 degrees F today when in fact it's about 94. This was at 55+ MPH.

Since it's clipped to the inner part of the lower grille, I don't know how good my relocation options are. Perhaps I'll fiddle with a variable resistor and see if I can make it read a bit more accurately. My assumption is that the part is a thermistor and so adding a few ohms might make it read a lower temp.
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yesimalex View Drop Down
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  Quote yesimalex Quote  Post ReplyReply Direct Link To This Post Posted: 10-Jun-2011 at 00:27
Really?

Not trying to be a dick...

But really?
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SirRangeALot View Drop Down
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  Quote SirRangeALot Quote  Post ReplyReply Direct Link To This Post Posted: 10-Jun-2011 at 00:57
Originally posted by yesimalex

Really?

Not trying to be a dick...

But really?


roflwaffles!
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B5crazy View Drop Down
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  Quote B5crazy Quote  Post ReplyReply Direct Link To This Post Posted: 10-Jun-2011 at 03:54
Mine is always high. +8 degrees F is not unreasonable in my car. I've just given up trying to solve the problem.
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RobG View Drop Down
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  Quote RobG Quote  Post ReplyReply Direct Link To This Post Posted: 10-Jun-2011 at 14:11
I've never noticed, tbh.
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MRAJB View Drop Down
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  Quote MRAJB Quote  Post ReplyReply Direct Link To This Post Posted: 12-Jun-2011 at 02:07
Mine reads about 5 degrees high as well. I could care less. 5 degrees isn't a big deal.
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