Parts for your 1998 Nissan Pulsar-Radiator

1998 Nissan Pulsar Radiator — what it does and how to look after it

Yes, a radiator is absolutely relevant and fitted to the 1998 Nissan Pulsar (N15). Technical sources including the Nissan Pulsar N15 Factory Service Manual (Cooling System “CO” section, 1995–2000), the Nissan Almera/Sunny N15 Electronic Service Manual for the same era, and Haynes repair coverage for the N15 platform all detail a liquid-cooled engine with a crossflow aluminium radiator and thermostatically controlled electric fans. These documents specify radiator inspection, coolant type, bleeding procedures and service intervals for GA and SR-series engines used in the ’98 Pulsar.

On this model, the radiator’s job is simple but vital: it sheds heat from the coolant so the engine runs at a stable temperature, even in Aussie or Kiwi summer traffic. Coolant circulates through the engine, picks up heat, passes through the radiator core to cool off, and heads back in to do it all again. The Pulsar’s setup uses an alloy core with plastic end tanks, automatics typically include an integrated transmission oil cooler, while manuals don’t.

Keeping the Pulsar’s radiator happy is straightforward and well worth it. Fresh coolant (mixed with demineralised water) protects against corrosion, scale and cavitation, while a healthy radiator cap maintains the right pressure so the coolant won’t boil prematurely. Most owners will be well served by replacing coolant every 2 years or around 40,000–50,000 km, or following the label on a long-life coolant if used. Expect roughly 6–7 litres system capacity depending on engine and heater core drain.

• Watch for tell-tales: sweet coolant smell, low reservoir level, residue around tank crimps, discoloured coolant, or temps creeping up under load.
• When replacing: choose a quality plastic-tank/aluminium-core unit. For autos, confirm the radiator has the correct built-in trans cooler fittings.
• Use a 50/50 mix of the correct ethylene glycol coolant (green Nissan Long Life style is typical for this era). Don’t mix coolant chemistries without a full flush.
• Bleeding tips: heater on full hot, fill slowly via the radiator neck, use the bleed point if fitted, squeeze upper hose to burp air, and run the engine until the fans cycle twice. Top up the reservoir after a cool-down.
• Replace the radiator cap (usually around 0.9 bar) if the seal looks tired, and inspect hoses and clamps while you’re there.

If the original plastic tanks are cracked or the core is weeping, a new radiator is typically a better long-term fix than patching. It’s an affordable job that protects the head gasket and keeps the Pulsar running sweet for years.

Popular questions about a 1998 Nissan Pulsar radiator

What coolant should be used, and what mix is best?
For most 1998 Pulsars, an ethylene glycol, silicate-safe green coolant (Nissan Long Life style) at 50/50 with demineralised water works well. That blend gives solid freeze/boil protection and the right corrosion inhibitors for an alloy core and mixed metals. Avoid topping up green coolant with pink/red OAT types unless you’ve flushed the system clean first.

How do you bleed the cooling system after a radiator change?
With the bonnet up and engine cool, heater on full hot, fill slowly at the radiator neck. Use the bleed screw if present, and gently squeeze the upper hose to burp air. Start the engine, let it reach temperature until the fans cycle at least once or twice, topping up as bubbles clear. After a full cool-down, recheck the radiator and reservoir levels and top up to the marks.

Is it better to repair or replace a leaking Pulsar radiator?
Small seeps at crimps or cracks in the plastic tanks often come back after quick fixes. Given age and materials, a quality replacement radiator is usually the smarter choice. If the core is badly corroded or the tanks are brittle, replacement saves headaches and helps protect the engine and, on autos, the transmission.