Inspection Before 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.

If the thermostat is suspected to be leaking, the following steps can be performed to check for leaks.
- The following check must be performed with the thermostat closed for 1 minute of engine operation.
- Use consult to monitor the coolant temperature. The coolant temperature should be less than 38°C [100°F] to make sure the thermostat does not open during the test.

Disconnect the radiator hose (upper) from the water outlet connection.

Install a hose of the same size on the water outlet connection. It must be long enough to reach a remote, dry container that will be used to collect coolant.

Courtesy of NISSAN NORTH AMERICA, INC.

Install and tighten a hose clamp on the outlet connection.
Place the other end of the hose in the container.

The coolant temperature should be monitored during this test to determine if the coolant temperature reaches the nominal opening temperature of the thermostat. If the thermostat opens during this test, the test is invalid and must be repeated. Refer to Standard and Limit .

Courtesy of NISSAN NORTH AMERICA, INC.
- Operate the engine at rated RPM for 1 minute.
- Stop the engine and measure the amount of coolant collected in the container.
- The amount of coolant must not be more than 100 cc [3.3 fl oz].
- If more than 100 cc [3.3 fl oz] of coolant is collected, the thermostat is leaking and must be replaced.