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If the screen is fine, like over your house windows, and right next to the various radiators that could be the cause. It would be my first look, second would be a vacuum on the coolant to ensure no remaining bubble some where since it was changed. IDK how sensitive these cars are to that, usually just refilling them and let them burp themselves but some cars that's not good enough. From there I'd try a new high quality thermostadt and ensure fans are running. Some go intermittant and do this.
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