Parts for your 2019 Nissan Pathfinder-Radiator

2019 Nissan Pathfinder Radiator — What it does and how to look after it

A radiator is absolutely fitted to the 2019 Nissan Pathfinder (R52). Nissan’s own technical documentation confirms it: the 2019 Pathfinder Owner’s Manual (Do-it-yourself maintenance: Engine coolant), the Nissan Service Manual for the R52 platform (CO: Engine Cooling System), and the Nissan electronic parts catalogue section for Radiator & Water Outlet all detail the radiator assembly, cap, electric fans and coolant service. So yes — a radiator is relevant and essential on this model.

On the 3.5‑litre V6, the radiator’s job is to shed heat from the coolant so the engine stays in its happy temperature window. Coolant is pumped through the block and heads, picks up heat, then passes through the aluminium radiator core where airflow (helped by dual electric fans) cools it before cycling back. In Aussie and Kiwi conditions — think hot days, long hill climbs and towing the boat — a healthy radiator is key to reliable running and keeping that CVT and A/C condenser stack working smoothly as well.

As part of routine servicing, using the correct coolant is critical. Nissan specifies a long-life, blue, pre-mixed ethylene glycol coolant that’s silicate- and borate-free, designed for alloy engines. Typical intervals are the first coolant replacement around the 7-year/160–170,000 km mark, then about every 5 years/120,000 km thereafter — but always follow the service book for your VIN. If topping up, don’t mix coolant types or colours, stick with the Nissan-spec fluid and demineralised water if a concentrate is used.

• Check the coolant level under the bonnet monthly when the engine is stone cold, use the expansion tank marks.
• Inspect for leaks, white/blue crust around hose joints, a weeping water pump, or a damp lower tank.
• Make sure the radiator cap seals and holds pressure, a tired cap can cause boil-over and air ingress.
• Keep the front of the radiator and A/C condenser clear of bugs and seeds, rinse gently from the engine side out.
• If replacing the radiator, it’s smart to renew the cap, upper and lower hoses, and thermostat at the same time.
• Bleed the system properly after any work. Using a vacuum filler avoids trapped air and hot spots.

When the radiator is due or damaged, choose an OE-quality aluminium/plastic unit. After fitting, pressure-test the system, verify fan operation, and take a steady test drive. Dispose of old coolant responsibly — it’s toxic to pets and wildlife. Do that, and the Pathfinder will handle summer road trips and weekend towing without breaking a sweat.

Popular questions

What coolant does a 2019 Pathfinder use?
It uses Nissan Genuine Long Life (Blue) premixed coolant that’s compatible with aluminium engines. Avoid mixing different coolant chemistries or colours, if you’re unsure what’s in there now, a full flush and refill with the correct fluid is the safest move.

How often should the radiator coolant be changed?
Typically the first change is around 7 years/approximately 160–170,000 km, then every 5 years/around 120,000 km. Always confirm against the maintenance schedule in the Owner’s Manual and your service history.

What are signs the radiator needs attention?
Watch for creeping temperature under load, fluctuating gauge readings, low coolant with no obvious puddles, a sweet smell after shutdown, or coolant staining on the radiator tanks or end seams. Any of these warrant a pressure test and inspection.