coolant ?

[seabee]

got my new radiator in today in the 93 240 i bought ran it for an hour or so started steaming really bad under the hood, opened it up it was coming from the overflow tank there was coolant in there full and boiling like crazy what will casue this and how do i fix it

[onosqv]

You probably didn't get all the air out.

Do a search on coolant flush, or bleeding air out of coolant, etc.

[Nismo_Freak]

Air in system is superheating the coolant.

Allow it to cool, and bleed the coolant system via the burp hole.

Check the level of fluid in the radiator while you do it.

Used distilled water and good coolant or you'll gunk up your radiator.