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.
https://www.rockauto.com/en/moreinfo.php?pk=8894092&cc=1427958&jsn=482
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