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How are you filling the engine/radiator? There are a couple of different techniques for helping avoid the "trapped" air issue. I have had good luck with filling the engine through the upper hose in addition to filling the radiator method before connecting that hose to the radiator. Keep adding it slowly until it is totally filled, you might encounter some air bubbles, but keep going until they are gone. You can also either raise the front (or rear, cant remember which one) while running will also help burp the system while running.