I think there is a small coolant leak under my dash board. The carpet is a little damp there and you can smell the coolant. I also see a little coolant coming from the drain hole on the firewall side. How hard is it to take out the heater core and replace it on a 88? Is this a do it yourself job or one a pro should do? I did the head gaskets myself. And if I wanted to have a shop do it, what do you think is a good ball park cost on the fix.