Anyone who has put an outside temperature display into their 300D please feel free to chime in.

I have an outside temperature display from a W126 in my 300D. It had worked flawlessly for the last two and a half years....until today. Started the car today and the display worked normally, registered the correct temperature and the backlighting came on with the outside lights.

After about 15 minutes, the display started counting up to +127 F, and then back down to 0 F all by itself. It did this several times and then bottomed out at -36 F and stayed there. I stopped the car for fuel, and when I turned it back on, the display was blank but the backlight was on. Got to work and shut the car off. Fast forward 10 hours and I start the car. Backlight on the temperature display works fine, but the display read +19 F all the way home (outside temp was about +35 F)

What do you think, bad ground, bad display, bad temperature probe?

Thanks,

Glenn

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2012 Mercedes ML350 Bluetec 102K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 238K (mine)
1998 Volvo S70 T5 Turbo 211K (kids)
1994 Ford F150 4WD 246K (firewood hauler)
1983 Mercedes 300D 384K (diesel commuter)