140536P010 is the part that comes out of the cylinder head and goes to the heater.
This diagram may also help you (the infiniti online parts book is pretty nice!)
http://parts.infinitiusa.com/nissanpart ... &siteid=15
click on the part on the left that you want, and it will display MSRP and the full part number. You can then go to Infiniti of Scottsdale (
www.infinitipartsusa.com) and they'll give it to you about 20% under MSRP. Let me know if you need anything else!