Thanks I didn't do the replacement it was done before I bought itFirst, welcome to the group.
Sorry you're having issues. Like 4silverado said, new doesn't mean good. Most common leak after replacement though IMHO is gaskets. If you did the water pump, did you do just the pump? How'd you remove the hoses? Sometimes you can cause an internal leak inside the hose and it can weep between layers.
Thanks don't have a tester but doesn't seem to leak any more at temp than coldAs much as I hate to say it… just cause it’s new doesn’t mean it doesn’t have a problem. Could be a crack or a gasket issue. Do you have access to a coolant system pressure tester? Pressurize the system and see if you can find the leak.


Oh yea thanks I will check the clamps firstI had a leak like that on my 99 Silverado... A few weeks ago I had replaced the water pump due to the classic drip from the weep hole.
New leak was dripping into the air compressor and down the rack and pinion.
I put an inspection mirror underneath the heater hose connections and it was leaking there. After a few minutes there was coolant on the mirror. Just needed to tighten the hose clamps.View attachment 6359View attachment 6360