Hey, well, I have a 92 benz... a w124 300E. It has an lcd temp readout in the middle of the guages. The problem is, at under 65 degrees (outside temp) the screen goes blank. Is there a reason for this? I have been reading about faulty temp probes... what kind of probe would I replace it with? Thanks.

Hmmm mines is blank most of the time for me I was told that I need the whole lcd component in the dash $ 225.00 used I dont know about the probe that you asking about but on my car the sensor sits between the bumper and the radiator

i have a 93 - mine is on right now but when it was hot it faded in and out and would be completely out at times. right now it's working and nothing seems to be wrong with it. not replacing a $200(?) part on account of that...

The probe wouldn't cause a screen blackout, it most likely is the LCD head...yep around $200/$250...unless you can find a second hand cluster and use that.

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00' C230K
88' 190E 2.3
79' 280CE (Sold)
84' 300SD
73' 450SE
93' 300E
68' VW Bug (what the hell was I thinking!)
99' HD FLSTF

Hmm... well.. the screen doesn't black-out... its just goes blank. Kinda as if it just turns off. Im pretty sure its not the lcd unit, because the unit always works above 65 degrees. So, I think im gonna replace the temp. diode. Now, could anyone tell me what type to get? I mean, is there a certain resitance I need? Anything like that. I think im actually going to rig it so I have several temp. diodes hooked up at the same time, and just wire them through a rotary dial, so then I can pick which temp. diode I want the screen to readout. But yea, type of diode to get would be greatly appreciated, thanks!

I have one from a 88 420SEL, any offer?

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BJ

09 GL320 Bluetec 65K+
07 E320 Bluetec 43k+
05 Nissan Frontier NISMO 4X4 72K+


07 Kawasaki Vulcan 900 5k+ gone
87 300SDL 158k+ gone
91 300D 113k+ gone
83 300SD 220K+ gone
89 300E sold
87 190E sold
83 380SEL sold
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Hmm... well I was hoping I could just pick it up at radioshack or Fry's... I mean... im gonna need like 6....

Hmmm... guys... anyone know what kinda thermal probe to buy? Anyone? Anyone? Will the radioshack variety work? Come on now... somebody has got to know....

Ask Phil in PartsShop!!

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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)

There are a couple of excellent threads on this topic. There is a fairly simple test noted in one of the following discussions for determining if the problem is due to the display or the temperature probe or thermistor, which is located under the front license of the (at least) the early 90s versions of the W124 cars.

I replaced the thermistor on my ’92 and it works fine. Should there be an interest, I have 3 of the thermistors. I bought a few at Allied Electronic. I’ll sell them for $7.00

Here are the articles:

outside temp LCD


87 300e outside temp gage






Regards

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...Tracy

'00 ML320 "Casper"
'92 400E "Stella"

One of the many reasons this is such an excellent site. I have a 92 300e 124 too. It has the identical problem. Some days the display is working, other days it is not. Haven't been able to notice any trend as of yet. I don't think I would go to all the effort of customizing with diodes but it is an interesting point. I think I will start with the external thermistor. Thank you for posting this thread and to all who have commented.

i wonder if this is related to my wiring harness problem. i don't get erroneous readings. the display just fades in and out sporadically. then it will stay on rock solid at times, which it has since my car has gone into the shop. regardless, i'm getting one of those thermistors..

lebenz, you've got mail!