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look for a colant leak at the back of the tinake manifold where it meets the head. look for a leak at the water hose on the right side of te tinake near the front. look for a leak in the front of the intake int he corner of the head and block.
next you are most likely hearing air move though the heater core. air bubles in e system like to get caught there and when accelerating the waterpunp spins faster causing more flow through the heater. bleed the cooling system and find your leak.
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