Where is the swirl control solenoid valve in a 2001 Infiniti QX4 ?

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It looks like your water pump on a 3.5L is run off the timing chain. I got some info which may help see it but may not be the exact as your car. If you are having some problems with overheating from what I saw looks like you have 2 thermostats and after changing thermostats, you can have air trapped in your engine, which will still allow engine to overheat.

see Swirl Control Valve in a lot of threads and Auto Help posts. It is actually called a Solenoid Control Valve (14956-31U01) as Nissan diagrams and parts lists don't have anything with Swirl.

The torque converter is inside the transmission. The (electric) clutch solenoid - usually - is on the outside of the transmission case.

Get a flashlight, get under the vehicle and look on the transmission case for electrical wires..

The link below will give you a general idea of what it may look like:

Transmission Control SolenoidsFor Infiniti J30 M30 Q45 and QX4

This code is set when the transmission control module detects improper voltage at the torque converter clutch. This can be caused by low tranny fluid/dirty tranny fluid/defective torque converter clutch solenoid/electrical connections to from solenoid

Follow hoses from charcoal canister. Solonoid will be on one of the 3 or 4 hoses. One goes to vent from fuel tank, etc....

According to Nissan, each cylinder has a valve in the intake manifold to control the air volume in the intake. The code is for one of the swirl control valve solenoids.
Code 443 is for the EVAP canister purge volume control solenoid which is a part the computer uses to vent the gas tank.
I would recommend a shop for both codes.

i think the code you are using is correct but the way you are using is wrong so i suggest you to visit the link give this link help a lot to me http://toolsnyou.com/

CODE PO744 AUTOMATIC TRANSMISSION TORQUE CONVERTER CLUTCH SOLENOID VALVE FAULT. POSSIBLE CAUSE FAULTY TCC SOLENOID.CHECK TCC SOLENOID WIRING FOR DAMAGE.OR YOU COULD HAVE FAULTY TCM OR ECM. IF THE TCC SOLENOID IS FAULTY YOUR ENGINE WILL STALL OUT AT A RED LIGHT OR STOP SIGN.YOUR ENGINE WILL STALL OUT AT EVERY STOP THAT WOULD BE SIGN FAULTY TCC SOLENOID.IF ENGINE DONT STALL OUT THE TCC SOLENOID COULD COULD BE STUCK OPEN, IF YOUR TORQUE CONVERTER FAULTY IT WILL CAUSE PREMATURE LOCKUP STALLING OUT THE ENGINE.

shift solonoid b is in the transmission. not a do it
yourself situation. clear the codes and drive , see
if it comes back before you take it in for repair.

also check wiring going to trans. look for broken
wires and wires that are rubbed through

This link shows the location of the SCV, If your motor is different the location should be similiar. http://img510.imageshack.us/img510/5687/vacuumdiagramuh3.jpg

There's a vaccuum line that runs off the SCV to the SCV check switch.

P0442: Have you inspected the lines, charcoal cannister etc? Make sure the fuel cap is tight. The easiest way to check the system is to have someone perform a smoke test. I had a DTC on my car which indicated a EVAP problem, it turned out to be the Fuel tank evaporator Control Solenoid.