Intake manifold coolant leak

[Leewozza]

Hi I've got a 2014 insignia  ecoflex  I noticed I'm loosing coolant I can see its leaking at the back of the engine  on the intake manifold  do I need to remove the cam belt and pump to fix the rubber seals 

[Vauxhall Owners Club]

It may be worthwhile to do so if the car is approaching the replacement mileage and then all the jobs in one hit