Behind the intake manifold there is a small metal pipe that sticks up that has a hose attached to it that leads the the coolant reservoir. This small metal tube connects on the other end into the intake manifold and has a hairline crack on it and sprays coolant through it when the engine is running. I have tried many way of repairing it with no luck. Is it possible to replace it without having to replace the whole manifold? And how would I go about this repair?