My heater core went out and i had to un bolt the dash and pull it back and set it on the front seats to even get to the AC and heater core box. Its the worst job iv ever had to do on my truck.

My heater core went out and i had to un bolt the dash and pull it back and set it on the front seats to even get to the AC and heater core box. Its the worst job iv ever had to do on my truck.well its getting that time of year again to use the a/c and after running the a/c the other night, i found that its leaking into the floorboard, somes goin out the firewall but most is going in the floorboard. was wondering if i had to take all the dash out to fix this or not? i've tried cleanin out the firewall tube but still nothing, thought maybe a dirt dobbers nest (don't know how to spell that lol) was built up in there but nothing came out, and even blew it out too. i didn't know if there was some kind of a gasket between the firewall and the ac box or not. any help?:confused013:
thanks
justin