Parts for your 2006 Subaru Outback-Tx valve

2006 Subaru Outback TX valve: what it does, where it lives, and how to look after it

Yes, the 2006 Subaru Outback is fitted with a TX valve (thermostatic expansion valve). This is documented in Subaru’s Factory Service Manual for the BP/BL Legacy/Outback (2005–2009) under the Air Conditioner section, which specifies an expansion valve controlling refrigerant flow at the evaporator. Subaru’s genuine parts catalogue also lists an expansion valve for this model (commonly referenced under part numbers in the 73520AG0xA range), and major aftermarket catalogues list a direct-fit expansion valve for the 2006 Outback. All of that confirms the TX valve is very much part of the system.

The TX valve’s job is to precisely meter liquid R‑134a into the evaporator based on temperature and pressure feedback, maintaining proper superheat. That keeps cabin temps stable, stops the evaporator icing up, and protects the compressor from liquid slugging. On the 2006 Outback, it’s a block-style valve mounted at the evaporator inlet where the A/C lines pass through the firewall (access is typically via the glovebox area).

When a TX valve plays up, owners often notice weak or inconsistent cooling, frosty or sweating lines at the firewall, hissing that comes and goes, the compressor short‑cycling, or pressure readings that don’t stack up. Contamination (metal or desiccant dust), moisture in the system, or corrosion can stick the valve open or closed.

• Best practice during service: if the system’s been opened or the TX valve is suspected, also replace the receiver‑drier/desiccant bag, renew all disturbed O‑rings, and add the correct PAG oil (ND‑OIL 8/PAG) amount for components replaced.
• Always evacuate and recharge by weight to the figure on the under‑bonnet label, guessing by pressures leads to drama.
• In AU/NZ, have an ARCtick‑licensed or appropriately certified technician handle refrigerant recovery and charging.

Replacement is straightforward for a competent A/C tech: recover the gas, access the valve at the evaporator connections, swap the valve with new seals, torque to spec per the Subaru manual, then vacuum, leak‑test, and recharge. Labour is typically 1–2.5 hours depending on access and corrosion at the fittings.

To help the TX valve (and the rest of the system) live a long life, keep the cabin filter fresh, ensure the condenser is clean and straight, and run the A/C regularly year‑round so oil circulates and seals stay supple. If cooling performance drops off or fluctuates, get pressures and temperatures checked early—catching a sticky TX valve before debris spreads can save a compressor.

Where is the TX valve on a 2006 Subaru Outback?

It’s a block-style valve at the evaporator inlet where the A/C lines pass through the firewall on the passenger side. Access is usually gained by removing the glovebox for working room, then disconnecting the two refrigerant lines at the bulkhead/evaporator connection.

Do you need to replace the drier when replacing the TX valve?

Highly recommended. Any time the system is opened, moisture and air can sneak in. Replacing the receiver‑drier (or desiccant bag within the condenser assembly on some versions) helps prevent future icing and corrosion, giving the new TX valve a clean, dry environment.

What causes TX valve failure on these Subarus?

Most failures come from contamination (metal fines from a worn compressor or desiccant dust), moisture, or corrosion. Incorrect oil type/quantity and repeated under‑ or over‑charging can also lead to sticking or erratic metering. Good evacuation, correct oil, and charging by weight keep the valve happy.