1990 Chevy Lumina Euro?

Blake E

New member
I've gotta 1990 lumina euro 3.1 and I just replaced the radiator and my low coolant light is on but the radiator is full of coolant so I'm thinking it could be the thermostat suck closed, It only took one bottle of antifreeze also and that filled the overflow to usually on my other cars it takes two, can anyone tell me what the problem could be?
 
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