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Message: <blockquote data-quote="MrNismo" data-source="post: 4186953" data-attributes="member: 13">The picture you show is the air conditioner compressor unit, the clutch will turn on/off momentarily, nothing much to worry about if it doesn't produce funny noise/smell and your air conditioner is working properly (ie cold)Few things that might contribute to your problem apart from what was mentioned above:1) Radiator too thick - Bigger doesn't always mean better as the thicker it is the more difficult it is for air to go through, and on top of that you don't have a fan shroud. Nissan clutch fan are excellent, but they only work well WITH a shroud. If your radiator core is thicker than 50mm, that would contribute towards temperature rise during idling/slow traffic.2) Aftermarket pulley kit - Seems like you have it from the pics as the power steering pump pulley looks 'aftermarket blue'. Bigger water pump pulleys are great to reduce cavitation at higher rpms, but you will suffer from overheating during idling/slow traffic. For street driven car, the factory unit is the best.3) Check if your fan is working, both the clutch fan and electric fan. I once have a busted fan relay and the electric fan stop working. As for clutch fan, turn off the engine after a drive and take note if the clutch fan stop spinning the moment you shut down or it keep spinning for another 10-15 seconds (which it shouldn't).4) Factory thermostat don't usually cause problems, unless there's blockage which limits water/coolant flow.5) An oil cooler will help, but only if you got the water temperature problems solved.6) I wouldn't worry about air/fuel ratio if the car is not idling erratically. Little significance with your problems.</blockquote>

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