Hi, I'm replacing the heater core on my 2000 ford f-150. Just removed the dash and now on to removing the plenum cover (aka "plenum chamber top") that houses the heater core. Thought this would be the "easy" part of the job, but after removing all the screws (i think) I'm unable to remove the cover! Are there some hidden or hard-to-reach screws/fasteners on the cover? Can anyone tell me where they are and how to remove?

FYI: I've been using instructions from my alldatadiy.com account as well as these instructions for the 2002 heater core replacement.
http://www.heatercorereplacement.com...le/-/view/110/
http://www.heatercorereplacement.com...le/-/view/111/

Thanks,
Mike

 

Sometimes you have to replace the entire box, or remove it to get at it due to hidden screws.

 

Removed the A/C plenum demister adapter to gain access (and see) to the hidden screws on the back side of the cover (there were 2)! Now on to taking the core out and slapping in a new one!

 

I just did the same thing, see that nipple looking thing look just to the right of it and there is an 8mm bolt deep in there.
Best of luck to you

God knows you need it...