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Q:

Car is only overheating when idling , not when on highway



on 2002 Land Rover Discovery

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
already changed: water pump twice, therm,. hoses. fan
(1) Answer
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You could have a failed cooling fan viscous hub or a thermostat that is not fully opening. Feel that the radiator has no cold spots when the engine is warmed up (would be a sign of a restricted radiator). Possible check for the presence of Carbon Monoxide in the cooling system, CO would be only present if the head gasket was blown.