Does anyone know the name of the hose that goes from the radiator the expansion tank? I'm trying to order one but i'm not sure which one it is. It's on a 85 300D.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k

Expansion tank hose. There is a smaller hose that goes to the top of the tank close to the radiator cap, its called the over flow hose?

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2001 Dodge Ram 2500 Cummins Turbo Diesel - 4x4, auto, 3.54 gears, long bed
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'92 300D 2.5 Turbodiesel - sold
'83 300D Turbodiesel - 4 speed manual/2.88 diff - sold
'87 300D Turbodiesel - sold
'82 300D Turbodiesel - sold

Is it for a California model or the other 49 states?

PartsShop fastlane lists: "Expansion tank to lower radiator
(California)"1985- They say that it is not available.

The same thing for the other 49 states is possibly part no.:
123 501 21 82 called Expansion tank hose. I assume they mean the hose from the bottom of the radiator to the bottom of the expansion tank. PartsShop Fastlane lists it for $7.90

thanks, yes it is the one from the bottom of the tank to the radiator.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k