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If only the top hose gets hot and there's plenty of pressure in the system it would point to the water pump. If there wasn't much pressure it could just be an airlock. I would get the water pump and thermostat done if the problem persists. You don't want to risk overheating and blowing your...

definately sounds like the water pump to me if only the bottom hose stays cold. Is there alot of pressure in the cooling system, are the hoses very hard when hot?