Hi, currently trying to replace blocked heater core. so far have only got under glovebox and realised I can’t actually slide the heater core out due to another part blocking its path out.    anyone else done this and have any ideas?    do I just need to start removing the rest of the part(s) under the glovebox?    picture attached - the part I’m talking about is the black box to the left of the heater core.  thanks