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Have a 98 powder special I put a new top end in over the summer. Rode it on day ran great with no over heating problem. Rode two days later get about 10 miles and sled starts to overheat, no circulation and blowing steam. Remove thermostat housing wide open, add water and seems to cool take off and she overheats in about 100yds. Can the water pump impeller not turn and still turn the oil pump. Or could it be it just had an air bubble.