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For me hooking up the cooler seemed to help me. Maybe its position helped get trapped air out.
While I am sure my aftermarket cooler is keeping my ps fluid cooler it somehow helped the system be smoother too.
I've seen cars boil the PS fluid on a simply winding road with no cooler. My '77 that has the OE cooler has never over heated. They work and you already have one. I don't see why you wouldn't use it. Ford got them a lot cheaper than we can, and they only included them with an extra cost cooling package.