Photo below. Running A/C off and on -- probably 92 degrees (F) outside today, and we were on the road for about 90 minutes at this point. Highway speed. Seem too hot? Will go down to just above 80 if I turn off the A/C for 5-10 mins.

Maybe I haven't been paying attention, but it seems like I'm seeing warmer temps and have just replaced the thermostat. May be time for a citrus flush?

-Chuck

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1982 300D, anthracite grey, 260k miles, Greasecar
1999 E300D, black, 160k miles, Greasecar
2010 Honda Insight Hybrid
http://www.chuckwyatt.com
http://www.wordimpressive.com

absolutely not. it's not even up to water's boiling point (100 deg C) let alone the overheating point (120 dec C). You're asking the engine to do more work, and you've reached an equilibrium point with the cooling. If it were at 100 or more then I'd start to get concerned.

That's just me, though.

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mjk

'84 300SD 119KMi (Liesl der Diesel)
'84 300D 326KMi when the oil left (former parts car)
'82 300SD 253KMi (new parts car)

That's fine. Anything under 100C, don't worry about it. Also remember that the gauge is not necessarily accurate. Check the engine with an infrared thermometer before worrying.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

Thanks folks. I've been fussing a little because my WVO temp gauge has been approaching 200 degrees (F), and that seems like a change and may have accuracy issues there. Clearly I'm fussing too much. Probably I need an infrared measurement to settle things, as suggested!

Happy 4th!

Chuck

__________________
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1982 300D, anthracite grey, 260k miles, Greasecar
1999 E300D, black, 160k miles, Greasecar
2010 Honda Insight Hybrid
http://www.chuckwyatt.com
http://www.wordimpressive.com

What, exactly, does that mean?

Thats exactly where mine sits when warmed up, all the time. Sometimes it raises just a tad more but never much. Is it supposed to be sitting right on the 80c mark?

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Clint. 1983 300D turbo, 150k
http://www.youtube.com/clintard

It means that the cooling system is getting rid of the engine's heat sufficiently well that the temperature of the coolant does not continue to rise (heat out = heat in). Implied is that the thermostat is working properly, the radiator is not clogged, the fan is working, the outside cooling air is absorbing heat from the radiator, etc.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

In the 100's here these days. Ours ran uphill for 75 miles at about that same temp today with the AC on all the way. No worries.

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You're a daisy if you do.
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84 Euro 240D 4spd. 220.5k sold
04 Honda Element AWD
1985 F150 XLT 4x4, 351W with 270k miles, hay hauler
1997 Suzuki Sidekick 4x4
1993 Toyota 4wd Pickup 226K and counting

If it starts getting near that little red bit, time to get concerned.

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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

Too hot??? Oh geeze....

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1984 300D, 228k, Light Ivory, Java MB-Tex