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Engine overheating at idle

The 3.0 Vulcan in my Ford Ranger overheats when sitting at idle. Temp slowly rises until it is up to the maximum mark. It is rather gradual, but it is a problem nonetheless. When I’m driving, the engine temp is normal, and when I shut it off, the coolant sounds as if it is boiling. Coolant levels are fine, and coolant is not very old. Any ideas? Thanks.

Check for a malfunctioning fan clutch.