Inspection After Removal

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.

Clean the coolant heater port thoroughly with a clean rag.
Make sure there are no burrs, metal shavings, or sharp edges that can cut the O-ring.
Clean the coolant heater thoroughly with a clean rag. Make sure the heating element is free of debris and buildup, and that the sealing area is clean.

Courtesy of NISSAN NORTH AMERICA, INC.

Check the coolant heater for cracks on the element.

Measure the coolant heater resistance. The resistance must read between 21.6 and 26.4 ohms.

Courtesy of NISSAN NORTH AMERICA, INC.

WARNING: To reduce the risk of personal injury or death from electric shock, do not touch electrical supply wires, injector solenoids or other electrical equipment. Do not wear jewelry or damp clothing, always wear appropriate protective equipment when performing electrical testing or repairs.

Coolant Heater Resistance (Ohms)
MIN	MAX
21.6	26.4