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Bad thermostat, air bubbles in the line, cooling fan relays not working, or the worst, bad head gasket. You can tell if it's a bad head gasket by white smoke coming out of the tailpipe, brown, sand-like gunk in the old radiator (and possibly new one) and oil mixing with your coolant.

Does your heater still work? If not, there's likely a bad thermostat or air bubbles in the line.

Make sure you reconnected all coolant temperature sensors. There is one in the radiator.

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15y ago

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