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#1
11-25-2011, 06:19 AM
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Strange temp reading from the guage
Hi all,
Posting for my friend who has 94 606. He called me over to have a look at his car as he said it was overheating, so I too it for a drive. From cold it got its temp up normally on the temp guage, but then passed 80C and beyond. The guage kept creaping up and up past 110C so I shut it off and open the bonnet to take a look. The thing is, it just wasn't showing any signs it was actally running hot,no typical smell that goes with an overheating engine, no extra coolant rushed into expansion, no loss of power. I started it up again and it went straight up to 120C and more, the needle was reading off the guage. Turned it off again to take one more look and then re-started it again (within one minute or so) but after re-starting it was reading 40C. What is with that? If it was a failing t'stat or water pump, then I wouldn't be able to get a 40C showing on the guage right?
__________________
1995 E300 Diesel 
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#2
11-25-2011, 08:58 AM
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anytime I get goofy readings from an electrical instrument I suspect grounding of the instrument.
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#3
11-25-2011, 10:19 AM
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Take engine and radiator temperatures with a non-contact thermometer to confirm the gauge
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#4
11-25-2011, 10:24 AM
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yuup. sounds like a bad temp sender to me. of course, it's a late w124, so bad wiring harness could easily cause the issue...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#5
11-25-2011, 06:10 PM
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I am in the process of adapting 123 temp & oil gauges into my 124's cluster. Sick of electronic problems with the temp gauge. It shows the correct temp 75% of the time & then just jumps to full scale for the remainder. Reliable gauges are a must.
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Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort....  1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles  1987 250td 160k miles English import  2001 jeep turbo diesel 130k miles  1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving
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#6
11-25-2011, 06:24 PM
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Quote:
__________________
1995 E300 Diesel
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#7
11-25-2011, 06:34 PM
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Quote:
I'm afraid to tell him of the cost for a new loom. With the exception of the manifold, it is a pretty straight forward job.
__________________
1995 E300 Diesel
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