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When I installed my heater I kept the lines relatively tight and did not have any problems with air pockets. You could try leaving the ends of the hoses unhooked where they attach to the block and fill one hose with coolant until it flows out of the other side, then pinch off the hoses and attach them to the engine. Takes two to three people to do it this way and you will spill a little bit of coolant that will have to be cleaned up. Either way, to be safe, leave the cap off of the purge tank when you start the engine so that air can bleed out.
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