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Old 01-06-2003, 08:50 AM
Michael's Avatar
Join Date: Jul 1999
Location: CT, USA
Posts: 2,699
Thermometer reads low-'88 TE


My 300TE's outside air temp gauge reads low, anywhere from 8-12 degrees below ambient temp. Very annoying. What's the most common failure on these?

Thanks in advance
"If everything seems under control, you're simply not going fast enough" --Mario Andretti

1995 E500 street car
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Old 01-06-2003, 01:58 PM
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Join Date: Sep 1999
Location: Miami, FL
Posts: 645
Too cool thermometer

MIne does exactly the same thing. When it is 80 degrees F my thermometer reads around 58. I thought it was due to being covered with road goo, but I cleaned it off, and this did not make ant difference.

Harbor Freight (1-800-423-2567) sells an inside/outside automotive digital thermometer for $9.99
(item 33080-2JJA)

I wonder if connecting the outside sensor of this unit to the wiring to the dash might work? I suppose that if it didn't, one could reconnect the old sensor with a bit of shrink tubing.

It would be a gamble, but 12 v negative ground is standard, and the risk of harming either device is less than the risk involved in 10 lottery tickets.
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1990 300D 2.5 Turbo sedan 171K (Rudolf)
1985 300D Turbo TD Wagon 219K (Remuda)

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Last edited by Richard Eldridge; 01-06-2003 at 02:06 PM.
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Old 01-06-2003, 03:39 PM
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Join Date: Oct 2002
Location: Colorado Springs
Posts: 481
guys there is a lot of discussion on this you need a new themistor. They cost about $5.
check these out outside temp LCD
87 300e outside temp gage
Martin Ingram
Colorado Springs
2005 320 CDI
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1991 560SEL (179000 Sold)
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