Q: Car overheating 2006 Infiniti M35

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I've recently taken my car out of town. While driving the car temp gauge remains at a constant(right below half) but when in idle the car over heats. The coolant then leaves the radiator and goes the the reservoir tank and stays there until I letbthe car sit for some time. The fans work and I don't see any apparent leaks. I've heard that it could be the radiator cap itself or that I need to bleed the radiator system. Wanted to get a professional opinion. Thanks

My car has 196000 miles.
My car has an automatic transmission.

Hello - the fact that your car maintains a steady temperature near design temp (center of the gauge), suggests the thermostat is working properly. Overheating while idling or at low speeds is usually a problem with a clogged radiator, faulty cooling fan clutch (engine-driven fan), inadequate flow from the water pump, or the cooling fan switch isn’t turning on the auxiliary fan soon enough. I recommend an overheating inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, and give you an accurate assessment of damage and cost estimate for repairs.

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