I'm working on a.2005 Lincoln LS with a 3.9liter v8 and it was overheating and the radiator was broken and leaked all over so I replaced the damn thing and the resavore / overflow why no heat
The thermastat is not in at this moment and I understand
that it will have a hard time getting to the heater core '/yet
the car still overheats and does not put any heat in the car
without a thermostat, your car will take much longer to heat up. The reservoir overflowed maybe due to an low coolant level or air in the system. Since it was overheating before you replaced the radiator, maybe the head gaskets were compromised. You can perform a pressure test and or leak down test on the engine cylinders to verify.
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