Does the coolant in the w123 flow from the bottom of the radiator to the top, or top to bottom? I'd assume the latter, but by feeling the hose that didn't seem to be the case. Now I'm confused!

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'81 300TD Wagon 355k (Miss Diesel)
'83 300SD 180k
'84 500SEL 190k (Parting it out)

81Wagon


A while back "Leathermang" posted the pics from the shop manual of the T-Stat and whats going on as the engine heats up, think the thread was about someone running w/o a T stat. Do a search, that would answer you question if you can find it.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"

Top to bottom. What can you feel from the hose to answer the question?

Sixto
95 S420
87 300SDL

it runs from top to bottom? if it ran out of the top of the radiator, then you would not be pumping anywater if you became even the slitest bit low on coolant. I'm not saying i know which way it runs, it just would not make sense to suck it out the top, especially if ther was not enough coolent to complete the loop. some one make it make sense, please.

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'73 VW camper
'80 300td wagon

I'm guessing you need to get a new radiator cap, then your upper hose will feel firm.

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JD

Coolant goes in the top of the radiator and is drawn by the pump from the bottom of the radiator.

Sixto
95 S420
87 300SDL