Coolant leak up top?

[Meir]

Originally Posted by NewArt

Is it necessary to drain the coolant in order to remove the oil cooler?

when i replaced the O-rings on my car as a preventive maintenance, i drained the coolant.
my assumption was that the cooler will be full of water, and you don't want to mix it with the oil.
that's how it looks when the cooler is removed.



and the O-Rings