heavychevydude

Hello all i have a question about engine cooling on these trucks... might need a new radiator. idk. 2004 sierra 1500 4x4 5.3 scenario 1- sitting in the shade with the AC on during 103 weather.... engine reached 230. had to shut the AC off and drive the truck to cool it back down. scenario 2- tuck pulling a 5,000lb trailer up a hill at 3,500 rmps 60mph.... truck reached 230, then cooled back down once the hill was taken and started cursing again scenario 3- going 90 mph at 3000 rpms with the AC on and 90+ degree heat outside..... truck reached 230, shut off ac and slowed down to cool engine. someone USED to make a high flow racing thermostat housing for these engines... but i think the rona & CA laws killed them.... but does this sound like a radiator issue? water pump works well. only 1 year old. fan clutch is good. how can i make this engine stay at 180. period. ???