Parts for your 2006 Nissan Pulsar-Tx valve

2006 Nissan Pulsar TX Valve — what it is, where it sits, and when to sort it out

For the 2006 Nissan Pulsar (N16 series), a thermostatic expansion valve (TX valve) is part of the factory air-conditioning system. This isn’t an orifice-tube setup. Technical references that support this include the Nissan Pulsar N16 Series Workshop Manual (HA—Heater & Air Conditioner), which shows a block-type thermostatic expansion valve bolted to the evaporator, and Nissan’s Electronic Parts Catalogue (FAST), which lists a “Valve Assy – Thermo Control” for N16 air-con. Major aftermarket catalogues used in Australia and New Zealand (e.g., DENSO and OEX/Ashdown-Ingram) also list a direct-fit TX valve for Pulsar N16 models spanning to 2006.

The TX valve meters how much R134a refrigerant enters the evaporator, reacting to evaporator outlet temperature and superheat. In plain speak, it’s the traffic controller for the cold side of the system — helping the Pulsar’s cabin stay cool without icing the core or starving the evaporator at idle. When it’s healthy, you get steady vent temps and decent performance in stop–start traffic and on the open road.

On the N16 Pulsar, the TX valve is mounted at the evaporator in the HVAC case (behind the dash/glovebox on RHD cars). It’s a block-style valve held by small bolts, sealed with O-rings. It’s not a routine service item, but it should be inspected for leaks, corrosion, or staining during A/C service. If replacement is needed, the system must be safely recovered, the valve swapped with new O-rings (lightly lubricated with the correct PAG oil specified on the under‑bonnet label), then vacuumed and recharged to spec by a licensed air-con technician (ARCtick in AU, suitably qualified in NZ). Best practice is to replace the receiver/drier or desiccant element whenever the system is opened.

Tell‑tale signs the TX valve may be unhappy include:

• Warm air at idle but cooler on the move
• Erratic vent temperatures or evaporator icing
• Hissing at the evaporator area and unusual high/low pressure readings

While access takes some trim removal, a pro will also pressure‑test with nitrogen, pull a deep vacuum, and confirm the charge weight. It’s worth checking the cabin filter and condenser cleanliness at the same time — both affect TX valve behaviour and overall cooling. Done properly, a new valve and fresh drier can restore crisp, reliable air‑con performance in a 2006 Pulsar.

• Does the 2006 Nissan Pulsar use a TX valve or an orifice tube?
  It uses a TX valve. Nissan’s N16 workshop manual and parts listings specify a thermostatic expansion valve at the evaporator rather than an inline orifice tube.
• Where is the TX valve on a 2006 Pulsar N16?
  It’s mounted on the evaporator inside the HVAC case, typically accessed by removing the glovebox/trim on RHD models. It’s a small block valve secured with bolts and sealed by O‑rings.
• Should the TX valve be replaced during routine servicing?
  Not by default. Replace it if diagnosed faulty or leaking. When the system is opened, always use new O‑rings and replace the receiver/drier or desiccant, then vacuum and recharge to the correct spec.