Parts for your 2013 Subaru Forester-Tx valve

2013 Subaru Forester TX Valve: What it does and how to keep it happy

Based on technical references, the 2013 Subaru Forester (SH series) is fitted with a thermal expansion valve (TXV) in its air-conditioning system. The Subaru Factory Service Manual for the SH Forester details an expansion valve mounted at the evaporator inlet behind the glovebox, and both DENSO and major aftermarket parts catalogues list a dedicated A/C expansion valve for this model year. Subaru’s genuine parts catalogue for 2013 Forester likewise shows the TXV as part of the evaporator assembly. So yes—this vehicle uses a TX valve, not an orifice tube.

The TX valve’s job is to meter the flow of R134a refrigerant entering the evaporator, responding to evaporator outlet temperature and pressure to maintain the right superheat. That keeps the cabin cool without flooding the evaporator, prevents ice-up, and helps the compressor work efficiently. When the TXV sticks or goes out of spec, drivers may notice weak cooling at idle, air that cycles hot–cold, frost on the evaporator or lines, rapid compressor cycling, or odd high/low gauge readings during diagnosis.

It’s not a routine service item, but it should be checked whenever the air-con is underperforming. If the system’s been open to atmosphere, contaminated, or a compressor has failed, the TXV can be affected by debris or moisture. Best practice when replacing a TX valve on a 2013 Forester includes evacuating and recovering refrigerant with licensed equipment, removing the glovebox to access the evaporator block, replacing O-rings (lubed with the correct PAG oil), and tightening the block fittings evenly to avoid aluminium thread damage. Any time the system is opened, replace the receiver–drier/desiccant (on many Subarus it’s integral to the condenser) and perform a deep vacuum, leak test, and recharge by weight per the under‑bonnet label.

DIY “top-up” cans aren’t recommended—wrong charge mass or oil type can harm the compressor. A tidy workshop will also check the cabin filter, condenser cleanliness, condenser fans, and pressure readings to confirm the TXV is the culprit rather than a weak compressor or airflow issue. Access on the Forester is relatively straightforward compared with full dash-out jobs, but it’s still a fiddly, sealed-system repair that’s best left to an air-con tech with an ARCtick licence in Australia or a certified handler in New Zealand.

• Common signs of a crook TXV: poor cooling at idle, icing on lines, rapid cycling, uneven vent temps, abnormal high/low pressures.
• Good practice: new O-rings, replace drier/desiccant, evacuate, recharge by weight, and verify superheat/performance.

FAQs

Where is the TX valve on a 2013 Forester?
It’s mounted at the evaporator block behind the glovebox. Removing the glovebox and some trim gives access to the refrigerant line connections and the valve body.

Do I need to regas after replacing the TX valve?
Yes. The system must be recovered, evacuated, leak-tested and recharged by weight. Opening the circuit releases refrigerant and air/moisture must be removed before refilling.

How do I tell if the TX valve or the compressor is at fault?
Proper diagnosis uses pressure gauges, temperature checks and performance testing. A sticking TXV often shows abnormal high–low pressure split and icing, while a weak compressor struggles to build pressure. A qualified air-con tech can confirm quickly.