Checking For Coolant Leaks

WARNING: This page is about a different car, the 2004 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Never remove the radiator or reservoir cap when the engine is hot. Serious burns could occur from high-pressure engine coolant escaping from the radiator or reservoir.

To check for leakage, Using suitable tool apply pressure to the cooling system and reservoir cap.
1. Testing pressure: 137 kPa (1.4 kg/cm, 20 psi)
CAUTION: Higher pressure than specified may cause radiator damage.

NOTE: In case that engine coolant decreases, replenish cooling system with engine coolant.
If anything is found, repair or replace damaged parts.

Fig 1: Pressure Checking Cooling System
Courtesy of NISSAN MOTOR CO., U.S.A.