Parts for your 2014 Subaru Forester-Tx valve

2014 Subaru Forester TX-valve (Thermostatic Expansion Valve)

Technical sources including the Subaru Forester (SJ, 2013–2018) Workshop Manual, HVAC (Air Conditioning) section, and the Subaru Genuine Parts Catalogue for 2014 Forester models identify a thermostatic expansion valve (A/C expansion valve) fitted at the evaporator inlet. That confirms the 2014 Subaru Forester uses a TX-valve rather than an orifice tube.

The TX-valve on a 2014 Subaru Forester is the metering brain of the A/C system. It regulates how much R134a refrigerant enters the evaporator and keeps superheat in check, so the evaporator gets cold without flooding the compressor. By reacting to temperature and pressure at the evaporator outlet, it helps deliver steady cabin temps whether it’s a mild Wellington morning or a scorching Perth arvo, and it protects the compressor from liquid slugging.

There’s no scheduled maintenance just for the TX-valve, but good A/C hygiene keeps it happy. A clean cabin filter maintains airflow across the evaporator, and a clear condenser up front helps pressures stay in range. If the valve sticks or clogs, the Forester may show tell-tale signs:

• Warm air at idle, colder only when driving
• Vent temperature hunting hot–cold
• Evaporator icing or a hissing/whistling at the dash area
• Abnormal high/low-side pressures on gauges

Replacement is a precise job and, in Australia and New Zealand, refrigerant work must be carried out by a licensed technician. The process involves recovering the gas, accessing the TX-valve at the evaporator connections inside the cabin (typically behind the glovebox area), replacing the valve and all O-rings, and adding the correct PAG oil allowance. Whenever the system is opened, the receiver/drier desiccant should be renewed, on many Foresters of this era the drier is integrated into the condenser, so the desiccant bag or the condenser assembly may need replacing depending on design.

After reassembly, the system is evacuated to a deep vacuum, leak-tested, and recharged to the exact mass shown on the under-bonnet label. Over- or under-charging will mask TX-valve performance and can harm the compressor. Alloy fittings are easy to damage, so correct torque from the Subaru service data is important. Once running, a quick check of vent temps, pressure balance, and that the evaporator isn’t frosting ensures the TX-valve is doing its job and the Forester’s aircon is ready for the next long summer drive.

Popular questions about the 2014 Subaru Forester TX-valve

Where is the TX-valve on a 2014 Forester?
It’s mounted at the evaporator inlet inside the cabin, usually accessed by removing the glovebox and trim to reach the HVAC case at the firewall. You’ll see two refrigerant lines meeting a small alloy block — that’s the TX-valve.

What are common symptoms of a failing TX-valve?
Expect inconsistent cooling (cold while cruising but warm at idle), temperature swings, evaporator icing, and odd hissing near the dash. Gauge readings often show very low suction pressure if the valve is stuck closed, or high suction if it’s stuck open.

Does the TX-valve need regular servicing?
No routine service is required. It’s replaced when faulty or whenever contamination is suspected. If the system is opened, replace O-rings, renew the receiver/drier desiccant, evacuate properly, and recharge to the factory-specified refrigerant mass.