When I turn the radiator petcock 90 degree, not a drop of coolant came out. I’m only able to get about 2-3 liters of coolant through the coolant pump. I poured 4 gallons through the expansion tank and it comes now clear. However, I’m afraid that I’m not fully flushing all the coolant out the system. Can I just fill with coolant mix and top up as necessary or do I really need to drain the radiator?
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