Your Nissan Zaroot engine control system detects a problem, the computer stores the diagnostic trouble
code U3639 in its memory.
To figure out what is wrong with your vehicle you must first extract the U3639 DTC For Nissan Zaroot.
Another consequence of U3639 Nissan Zaroot engine overheating may be a blown head gasket. Heat makes aluminum swell almost three times faster than cast iron. Thermal stress can distort the head and make it swell in areas that are hottest like those between exhaust valves in adjoining cylinders, and areas that have restricted coolant flow like the narrow area that separates the cylinders. The typical aluminum head swells most in the middle, which can crush the head gasket if the head gets too hot. This will usually cause the head gasket to leak compression between adjacent cylinders, or leak coolant into the cylinders.
U3639 Nissan Zaroot DTC Meaning
Network Code - Problem is climate control system, lighting, airbags, etc.
SAE - Generic
Vehicle Speed Control And Idle Control System
Low Coolant Circuit
A/C System High Pressure High Temperature
The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. U3639 Nissan Zaroot code had an elaborate diagnostics procedure, including showing engine trouble codes on the air conditionning display. However, the system was troublesome, misunderstood by customers, and a rash of unpredictable failures led to the technology being quickly retired.