I need some help removing the evaporator core. I have all the dashboard and trim panels removed. The HVAC module will not come out because as best I can tell, the heating pipes still have one bolt in them that is only accessible from the engine bay. The problem is that one bolt isn't exactly accessible. The shop manual calls for removing the engine manifold and various hoses to get at it but this seems like a lot of work and a strange protocol for working on the air conditioning unit. Has anyone else attempted this?