Side note: what temperature is the line between 80c and 120c? I haven't been able to establish that definitely.

I would normally suspect a bad fan clutch, but I don't think the 240's have one. If it does have a fan clutch, there is your problem. If not, I agree with others on a clogged radiator.....Rich

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All Diesel Fleet
1985 R107 300SLD TURBODIESEL
2005 E320 CDI (daily)

LOTS of parts for sale!


EGR block kit
http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html

1985 CA emissions 617 owners- You Need This!
Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst.

Sanden Instalation Guide (post 11):
http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html

right, none of my 240s have had clutches, this one no exception

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78 240d: Mona
81 240D: Lola
77 toyota chinook: Carlito
93 chevy k1500: Cowboy

i thought it was 100c, but ??

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78 240d: Mona
81 240D: Lola
77 toyota chinook: Carlito
93 chevy k1500: Cowboy

You could be right, I'm just not positive myself. If 90c is where is 'should' be, then id be surprised there wasn't a line there.