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I know that the top radiator hose on my 4.0 liter OHV gets hot when the

engine thermostat opens allowing the engine coolant to flow through the radiator

and the bottom return hose connects the radiator to the water pump should be

cooler - sounds normal to me but I'm not a mechanic / technician

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14y ago
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Q: Engine runs for 15-20 minutes top radiator hose hot bottom cool?
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