Yes, the cooler leaks. I bought a parts car thinking I may need a trans. So I wanted to get this leak fixed, or decide to change the trans. before changing out the radiator.
I think I found the leak. Seems to be coming from the bottom of the dipstick tube.
Looks like a bolt bottom and top, then pull tube and replace the seal? Is it that simple? What size is the o-ring on the dipstick tube. Fix and check it.
Then on to changing out the radiator.

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83 300SD Dark Silver Dark brown inside