I maybe be losing it but I went out today to change my radiator cap but I can't find the damn thing. I definitley am not a engine guy so maybe I just passed over it. I figured it would be in front and noticeable but I dunno.

 

IIRC the 3 doesn't have a cap on the radiator. The cap on the overfill bottle acts like the pressure cap for the cooling system.

 

Well that would explain it. Boy do i feel like an ***.

 

damn, i didnt realize that. good info.