Parts for your 1991 Nissan Primera-Radiator

1991 Nissan Primera Radiator — Purpose, Maintenance and Replacement Advice

Based on technical references including the Nissan Primera P10 Series Service Manual (Cooling System section), the Nissan Electronic Parts Catalogue (EPC) for P10, and the Haynes Nissan Primera 1990–1999 manual, every 1991 Primera (petrol GA16DE/SR20DE and CD20 diesel) is liquid-cooled and fitted with a front-mounted radiator. So yes, a radiator is absolutely relevant and used on the 1991 Nissan Primera.

The radiator’s job is simple but critical: it dumps engine heat into the airstream so the motor runs at the right temperature, improving performance and longevity. The P10’s crossflow aluminium core with plastic end tanks works with the water pump, thermostat and twin electric fans to keep coolant circulating and temps stable, whether it’s a city commute or a long Kiwi or Aussie highway slog. On many automatic models, the radiator also houses a small transmission oil cooler in the bottom tank.

Keeping the radiator happy is straightforward and well worth the effort. Owners should check coolant level and colour under the bonnet regularly, look for white/green crust on hose joints, and watch for damp patches around the end tanks. A healthy system uses the correct ethylene-glycol coolant (typically green) mixed 50/50 with demineralised water. Most P10 engines take around 6–7 litres total, depending on the engine and heater circuit fill.

• Flush and refill coolant every 2 years or 40,000–60,000 km unless using a long-life formula that’s compatible with 1990s Nissan seals and metals.
• Replace the radiator cap (around 0.9 bar/13 psi) if the rubber is perished or if pressure tests fail.
• Inspect upper/lower hoses and clamps