Coolant is still running too cold?

[Robo]

Yeah mate. You were right about T pieces being there for a reason. And I was wrong about heater core coolant entry having a four way valve as above anyway. I've corrected that in a post after that, and I'm just about to post all the details, pictures from the factory manual and Gregory's manual about it.
T joints were put there 'cos there's no other way to do it. Series setup would've cut the coolant flow to LPG converter or heater core or both depending on which one I plumb the coolant entry first. When the tap inside the heater core is shut by sliding the dashboard heater slider to cold, that will cut the coolant flow completely, which won't be a good thing for the LPG converter to start with.(and may even create cavitation air bubbles on the coolant return line to the engine block, which would "help" to create cracks in the cylinder head in no time, so it's definitely a bad idea)

I will replace the thermostat with a brand new stock one (76 degrees) to start with and see how it goes, 'cos the current one is opening up at around 70 degrees or bit less, which I think the major reason for low temperature. If the new one still yields low temperature then I will install a one bit higher, like 80 degrees or so.

I will also replace T pieces with Y pieces soon. I've been told it's better for the flow and helps reduce cavitation(air bubbles inside coolant).

Cheers
Dom

Forget about installing a thermostat with a temp you think may be the right temp setting.
Ask Mr Nissan for a thermostat to suit your vehicle VIN number.
Then ask him what'c the temp setting that's stamped on it?.
Don't quote me, I believe the Gen p/No is 2120042L01W and about $45.

Cavitation from a t piece--- doubt it.
The Y would reduce back pressure for sure, just insure you get the flow direction correct.
that is the stem feeds the y on the hot side too heater and lpg mixer
and the y part feeds back from the heater and lpg mixer to the stem on return .
I tried Y's on GQtb42 lpg, didn't see any difference at the gauge , you may get a deg or two difference if you spend $20 per joint on a Y.
Then again it may allow the water to flow to fast through the lpg and heater cores to allow sufficient time for more heat transfer who knows!.
The speed of flow needs to be just right to allow time to cool off, to fast and water retains more heat.
Again this gets back to the job of the thermostat helping to control flow.
See how you go with the thermostat first hay. cheers.