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Before doing anything else I would replace the cap on the coolant reservoir. Get the cap from Volvo. Even a small crack or seal leak will allow the coolant to boil due to lack of pressure. Old caps can fatigue and not hold pressure. Don't assume the engine is damaged unless there is actual evidence of that. After replacing the cap fill the system to the proper level with the engine stone cold. Squeeze the radiator hoses to be sure the coolant has filled in everywhere and there is little or no air in the system. Start the engine up and observe it as it warms up - don't drive somewhere, watch it. Look for any loss of coolant or smell of coolant so you can see if there is a leak. Any leak will also lead to overheating due to loss of pressure at the leaking point, even if nothing else is wrong. Run the engine until the cooling fan cycles a few times, unless it overheats before then. If the engine starts to overheat without any loss of coolant then the radiator or some other part of the cooling system may be obstructed. If there is an obstruction you may feel the radiator hoses getting very hard.
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