'92 Cavalier heater core cover removal

Howdy folks..... :-)
'92 Cavalier, 2.2, air conditioning, station wagon. Heavy coolent leak from heater core floor drain. Having read previous posts concerning this kind of problem, I am hoping it's just the
plastic fitting that's gone but am unable to ascertain what's going on due to my inability to get the ruddy heater core cover off! <grin>
I've removed 7 hex screws from the cover but the rascal won't budge. <grrr....> My repair book (Haynes) doesn't have any diagrams or sufficient info on this topic. Removed the floor heating coupling too.
Do the engine compartment heater lines need to be uncoupled before heater core cover removal?
Haynes mentions "clips to be removed".....can't see any though.
Any kind of sealant between the cover and the core, that needs some gentle screwdriver prying to open the rascal?
Any suggestions would be most appreciated! Thanks..... :-)
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
yes that is how it comes out, usually a bracket on the pipes that holds to he lower inst panel. As far as I know the clips hold removable pipes to core, accessible after it it out.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.