[DennisTheB]

I recently replaced my 2000 Catera's radiator which was a horrifying experience but that's another story.

I seperated this located on the left-hand side of the radiator and i did not notice any o-ring..

When putting it back together, it leaks (transmission oil).

What type of o-ring is needed to seal it?

Many Thanks.

 

[rodnok01]

Check gmparts sites and it should show detail of what seals that and a part number. Hardest part is finding the actual sub section...