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Old 07-28-2019, 08:53 AM
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smj999smj smj999smj is offline
Master Enthusiast
2006 Pathfinder
2003 Frontier King Cab
2003 Frontier KC SVE 4x4
Join Date: Jun 2012
Location: Prospect, VA
Posts: 1,849

If it overheats when idling or at slow speeds, it is likely an airflow issue. This is often caused by a bad fan clutch, debris (like leaves, paper) in front of the A/C condenser or between the A/C condenser and radiator cores, bent cooling fins on the A/C condenser or radiator cores, cores fins clogged with dirt and sand, etc., or, if equipped, an auxiliary electric fan that is not working. If it is only overheating while driving at highway speeds, then you should still look at the condition of the core fins, but you may also have an issue with a restrictive radiator, bad thermostat or a possible bad head gasket.
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