What are saying roundabout...if you are saying after replacing a radiator temp goes up and down while driving there are many things that could cause that..check for collapse hose "very soft when squeasing " But I would suspect either low coolant or air in the system locked in after changing rads..many vehicles need the system bled of trapped air whenever opened..I would .have all Checked and the system bled...one other sticking thermostat...good look..
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What are saying roundabout...if you are saying after replacing a radiator temp goes up and down while driving there are many things that could cause that..check for collapse hose "very soft when squeasing " But I would suspect either low coolant or air in the system locked in after changing rads..many vehicles need the system bled of trapped air whenever opened..I would .have all Checked and the system bled...one other sticking thermostat...good look..