Parts for your 2013 Toyota Hilux-Tx valve

2013 Toyota Hilux TX valve — what it does and how to look after it

Yes, the 2013 Toyota Hilux uses a thermal expansion valve (TX valve). Technical references that confirm this include Toyota’s Electronic Parts Catalogue (lists “Valve Sub-Assy, Expansion” for 2011–2015 Hilux variants such as KUN/GGN), the Toyota Repair Manual HVAC section (shows a block-type expansion valve mounted at the evaporator), and DENSO air-conditioning service literature that details TXV/receiver-drier systems as used on Hilux models of this era.

The TX valve sits at the evaporator inlet (behind the dash near the firewall) and meters R134a into the evaporator based on superheat. In plain terms, it keeps the evaporator cold without flooding liquid back to the compressor, so the ute stays cool in traffic and on the open road while protecting the compressor from liquid slugging.

For a 2013 Hilux, the TX valve is generally a block-type unit bolted directly to the evaporator core with two pipe unions from the engine bay. The system uses R134a and DENSO ND-OIL 8 (PAG 46) oil, a receiver-drier is part of the system (on some builds it’s integrated with the condenser).

When should a TX valve be replaced? It’s not a routine service item, but it’s smart to check it any time the system is open or after a compressor failure. Common clues it’s unhappy include:

• Intermittent or weak cooling, especially at idle
• Frost or sweating on the evaporator pipes at the firewall
• Hunting vent temps, hissing, or abnormal high/low-side pressures during a gauge test

Good practice during servicing:

• Have an ARCtick-licensed tech recover the refrigerant, then remove the glovebox/evaporator cover to access the valve.
• Replace the TX valve and all related O-rings, lightly oiling them with the correct PAG oil. Torque fittings to factory spec and avoid over-tightening.
• If the system’s been open or contaminated, replace the receiver-drier (or the condenser if the drier is integrated), flush as required, evacuate under vacuum, and recharge to the label-specified R134a weight.
• Keep the cabin filter (if fitted) clean so airflow and evaporator superheat control stay on point.

A quick air-con performance check every couple of years helps catch a sticky TX valve early. When done right, the Hilux’s DENSO system is tough as nails and blows nice and cold across Aussie and Kiwi summers.

Does a 2013 Hilux have a TX valve or an orifice tube?

It uses a TX valve mounted at the evaporator, not an orifice tube. Toyota parts catalogues list it as “Valve Sub-Assy, Expansion” for 2011–2015 Hilux models.

Where is the TX valve on a 2013 Hilux?

It’s behind the dash at the evaporator, right where the two A/C pipes pass through the firewall. The valve is a compact block sandwiched between the pipes and the evaporator core.

Do you need to re-gas after replacing the TX valve?

Yes. The system must be recovered, evacuated under vacuum, then recharged with the correct R134a amount and oil balance by a licensed technician, followed by a leak and performance check.