GMC Repair: heater core replacement, heater core replacement, gmc sierra

Question
How hard is a replacement on 98 Gmc sierra?I have to replace the water pump and the heater core asap.
Easy or hard???

Answer
Hi
It's easy for me..... but I've done 60 or so of them.
The bottom panel needs to be taken off. There is a bolt WAY in bac, against firewall. DONT forget to take it out.
It also NEEDS to be reinstalled  (As do ALL the screws (7) removed) or the a/c drain water will leak on the carpet.
I hope this helps.
Good luck
Pawl