cost to replace heater hoses

I'd guess up to 1 hour's labor time and parts incl. hoses, clamps and coolant plus disposal fees. I'd guess about $100 to $120 in parts, labor is regional so you'll have to get an estimate locally. I'm attaching our estimator link, may be of some help. https://repairpal.com/estimator/gmc/2500+pickup If you want to find a specialist, here's a directory link for you: https://repairpal.com/gmc-repair-in-plano-texas