In at least one implementation, a cap for a vehicle fluid reservoir includes a valve having a first valve portion that includes a valve passage closed by engagement of at least two portions of the valve with each other and opened when at least two portions of the valve are separated from each other to control fluid flow through the valve in a first direction and a second valve portion that controls fluid flow through the valve in a second direction different than the first direction. The second valve portion includes a flange engageable with the valve seat to selectively permit fluid flow between the flange and the valve seat and a biasing member received within the chamber and providing a force on the valve to yieldably bias the flange into engagement with the valve seat.