Most garages can put preessure on your system to check for a high pressure leak. Also how old is your radiator? Sometimes it may look good but not have proper flow and flushing it at home don't work. You could pull it out and have the flow checked at anny good radiator shop. I used to have trucks and sometimes they took the tanks off and rodded the cores to get the barnicles out and put them back together. I don't think they do that to small car radiators.
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