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You definetely need a book.(repair manual)
Hopefully you have one.
That said, let's get on with it.
You have tried a lot of thermostats, you will need to get the Nissan factory replacement.
It is the only one with the correct bleeder vavle in it.
Also , it is rated at 180 degrees.
This bleeder valve needs to sit on the top side when installed.
nothing should obstruct it. Like the gasket or gasket material.
When it is functioning properly, it lets a small amount of coolant flow past the thermostat, thereby keeping the air out and a safety valve in.
The correct way to bleed the system is as follows:
Open the air bleed valve in the head, located under the wire loom for the spark plugs, it is a 10 mm bolt.
With the correct thermostat installed, open the radiator and pour in coolant slowly until it comes out the bleeder bolt.
You may help this procees along by slowly hand pumping the lower radiator hose.
If coolant does not come out the bleeder bolt , you either have the wrong bolt or the system is blocked.
With the coolant now flowing from the bolt, close the bolt snugly.
Replace the radiator cap and fill the reservoir.
Check reservoir level in two days.
Two more issues from your post:
Have you replaced the timing chain?
The EGR is hooked to the BPT and they are both vacuum operated.
On a side note, check the vacuum line right under the air cleaner that goes directly into the intake. This one fails a lot.
Keep at it Bob, you"ll get 'er.
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