My car is leaking coolant but not running hot.
Weather conditions and the severity of the coolant leak can all be factors as to why over heating occurs. A cooling system pressure test should be performed by a technician in order to pin point the location of the coolant leak. As long as the system pressure is still somewhat up to par and the leak is slow, the system will still work without overheating. If left alone to worsen, over heating can happen over time.
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