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· RIP Our Friend
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Yes it closed loop. Every car since the mid 50's works on the pressurized sealed system. Unless you have had a cooling system part replaced, or a service already, there would be no air in your system. The only way you would have air in your cooling system is if the system has been drained and improperly filled/bled. If that were the case you should have seen sporadic heat inside or even overheating.
 
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