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On my 73 Winnebago Brave, the radiator split a seam 'way out in the desert. Had it towed home, replaced radiator, saw a few small fins leaking, added some stop-leak which seemed to fix it. Tested on freeway, found it over-heated. Noticed it would work fine if I kept my speed no more than 55, figured water pump was beginning to fail. replaced pump & put in 180 thermostat. Tested again, same results. Over-heated unless I kept it below 55. Works perfectly below that speed. The replacement radiator was used, and I suspect it may have a partial clog. Can anyone suggest either another possibility or a way to confirm a partial clog? I know I can have the radiator checked out, but for even less I can totally replace it, but I don't want to spend the summer pulling radiators, lol. Can anyone help?? Thanks