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I've flushed my heater core and replaced the thermostat a few months ago. The heat is going out again. Just curious if any one has replaced a heater core before? I looked online but I can't find a good description on how to take it out. 94 Caprice
 

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Just do a Search "heater Core Replace" and you will find threads and maybe the Stickies at the top of the coolant section will have info. I believe the Chilton Manual ($20 at most stores) also has this documented. Pretty straight forward project really with one "Bugger" of a screw to get to near the FW thats in a tough spot to reach. Removal of the Passenger Seat was a big help for me and only took a few minutes and well worth the extra space you get to work.

Once you get the Plastic cover off, you will notice a seal of some sort in the Channel that seals it to the bottom of the box. I just used RTV in the Channel and it appears the factory did this as well. Let it set up for a good while and then install.
 

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When you flushed the core did you flush the whole cooling system? Unfortunately any gunk in the system will wind up in the core and multiple flushes may be needed. I wouldn't replace the core unless it is leaking, it is not a fun job.
 
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