Radiator problems are fairly common for the Nissan Pickup. The common approach as far as a repair goes is flushing the fluid out and refilling it with new one. However, this won't always work especially with a problematic radiator such as that of the Pickup's. That's why it's important to be aware of the symptoms that tell you need to replace your stock radiator with a new one. Here are some of the common signs:
When you flush the fluid out of the radiator and you notice that its color is brownish and rustic, this is a sign that the stock unit is in need of replacement. The rust comes from the wear and tear the part has accumulated overtime. There's not much you can do if the insides are slowly being flushed away with the fluid. As the truck ages, the radiator rusts even more.
Hearing a mild whistling sound somewhere behind the truck's glove compartment with the air conditioner on is also an indicator of a radiator slowly going bad. To be specific, there is a leak somewhere in the heater core that's responsible for giving off the sound. An added symptom is some water entering the passenger cabin accompanies that sound.
The fan of the Nissan Pickup radiator should stay secure at all times. However, too much play on the part-which could escalate to fallen and torn blades-is a problem that needs immediate attention. The clutch of the pulley and fan may also be loose. You should start replacing these parts to ensure cooling efficiency.
Radiator fluid should circulate around the engine, through the heater core, hoses, and overflow. If there's no liquid inside the reservoir tank, this is a sign of a bad thermostat that's not making accurate readings. Replace this at once to return coolant flow.
An engine easily overheating, regardless of speed, is an obvious sign that the Nissan Pickup has a restricted radiator. By this time, there's not much you can do with the existing unit but replace it with a new one as well.