The first generation Infinity FX45 (VK45DE) has 2 thermostats.
The first one is slightly below the filler neck of the coolant, and to get to the second, you need to do the following:
1. Wait until the car completely cools.
2. Remove the terminals from the battery.
3. Remove the air filter together with the box and mass flow sensor.
4. Disassemble the throttle.
5. Disconnect all vacuum tubes.
6. Scroll down 13 bolts of the upper suction manifold.
7. Scroll the fuel tube which is suitable for the nozzle on the left side of the traffic. This could lead to some gasoline.
8. Disconnect the connecting tube of left and right injectors 9. Disconnect large slots from each side.
10. rotate two screws that secure the fuel racks and pull the gear racks up. The fuel line shall be removed along with the spray nozzle and cables. 11. From the rear of the lower intake manifold, the arm of the vacuum pump must be disconnected and the bottom 10 bolts and the lower part of the intake manifold are removed.
12. The troub located in the centre is suitable for the second thermostat. It is located here:
13. The crankings need to be removed by removing two bolts from the bottom and 2 bolts. The thermostat is holding tight, it's not easy. You might have to use a screwdriver. If he does harm, it's all right, it'll be replaced. The assembly is in reverse order.
