That was true years ago but today there are literally dozens of manufacturers around the world, most cheap ones are out of China.
Spectra made some high quality copper and brass units in Canada but they are scarce today, they have been replaced with aluminum/plastic from China or Mexico.
Modine still produces most GM and OE Delco replacement radiators, heater core and transmission coolers in the USA. The box store Delco are Mexico or China.
Spectra made some high quality copper and brass units in Canada but they are scarce today, they have been replaced with aluminum/plastic from China or Mexico.
Modine still produces most GM and OE Delco replacement radiators, heater core and transmission coolers in the USA. The box store Delco are Mexico or China.