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Old 11-22-2004, 06:33 AM
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Join Date: Oct 2001
Posts: 592
1986 300sdl fan clutch

the bugger seemed to be running much warmer than the other three diesels in my stable. did flush radiator. and new thermostat. replaced the fan clutch this weekend as per my searching here the fan should stop in a turn or two of shutting off engine. mine spun a lot longer. well new clutch spins quite a bit after warm shut down. and the temperature guage stills reads above 90 at highway speeds. fan clutch purchased here on fastlane. a beur unit. is this new clutch defective? and by instruction i had the thing positioned vertically for the month or two it was on my work bench. any advice is surely appreciated.

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Old 11-22-2004, 09:32 AM
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Old 11-22-2004, 11:11 AM
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Join Date: Nov 2002
Location: Milford, CT
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90c on the highway is normal. Mine runs that in the summer with the AC on. If it only is running warm on the highway it sounds like your radiator is getting clogged. It might be a good idea to take it out and clean it up a lot of crap gets stuck in it.
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Old 11-23-2004, 02:40 PM
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Join Date: Aug 2001
Location: USA
Posts: 8,102
The new 606-style fan clutch with plastic blades triggers at a higher temp than the old 603 clutch with metal blades - I think. Mercedes printed specs for the old but not for the new. This is just a theory, but it would improve MPG due to less drag and higher engine temps (95C is more efficient than 80C). Mine runs at 90-95C almost all the time but very rarely touches 100C.

If yours is getting to 100C+ with a new clutch, the radiator is #1 prime suspect...

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Old 11-25-2004, 11:05 AM
Join Date: Aug 2000
Location: Holland, MI
Posts: 1,316
Those temps in stop-and-go wouldn't alarm me, but it should cool off at highway speeds.

I think you should be running a bit cooler. With a 'bad' fan I'd expect it might take a bit longer to cool down.

I'd suspect a still-diminished radiator. Perhaps the flush didn't quite get it all, or it's still partially blocked.

My 86 SDL ran 'warmer' at stop and go, would reach 90-95+, but always cooled to 85C or so on the highway. I then found the radiator had a leak, and so it was replaced.

It's still running at 85C on the highway, and not much warmer around town.

As the car is warming up, carefully check the radiator for uniform heating by feel. 'Cold' spots may mean partial blockage.

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