Heater core replacement on 4.0L YJ?

Craig

New member
1042700

I'm trying to change the heater core on my 93 YJ 4.0L. I looked at the Haynes manual and loosened all the bolts it says to loosen but the thing won't budge. I've looked over the whole thing and I don't see anymore bolts. I know I haven't missed any bolts sticking through the firewall...there's none left to loosen. I've tried pounding on the bolts that stick out through the firewall with a hammer and nothing. Am I missing something or are these things sealed in there somehow?[addsig]
 
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