I have a aftermarket radiator in my excavator hot days it wants to heat if i turn air conditioning off, i can manage it then, had rad shop check rad last year he said it had good flow so i put new thermostat in he also said he wasn't sure what cat rad was compared to this one it is a 4 core it seems to me it just dosnt have the flow capacity.Priced out a new rad from cat 3600.00 but maybe theres a reason there pricey.
Got new factory rad runs cool now