Parts for your 2018 Honda Cr-v-Tx valve

2018 Honda CR‑V TX Valve: fitment, purpose and servicing advice

Yes, the 2018 Honda CR‑V is fitted with a thermostatic expansion valve (TX valve or TXV). This is confirmed by Honda’s service literature for the 2017–2019 CR‑V HVAC section, the Honda electronic parts catalogue for RW/RV chassis which lists an “A/C Expansion Valve” at the evaporator inlet, and major A/C component catalogues from OEM suppliers that specify a direct‑fit expansion valve for these model years.

On this CR‑V, the TX valve’s job is to precisely meter liquid refrigerant into the evaporator based on superheat, keeping the air‑con cool without icing up the core or starving the compressor. It balances cabin cooling performance with compressor protection and fuel efficiency, especially noticeable in stop‑start city driving and hot Aussie and Kiwi summers.

The TXV isn’t a routine “replace at X kilometres” item. It’s typically serviced only when symptoms point to a metering issue or when the system has been open for major work. Common signs of a crook TX valve include:

• Weak or inconsistent cooling, especially at idle or after a short stop
• Evaporator freeze‑up or noticeable frost at the valve/lines
• Hissing, surging, or rapid cycling, abnormal high/low side pressures on gauges

If replacement is needed, it’s a licensed air‑con job. The system must be recovered, not vented, then the valve and O‑rings are replaced and the system evacuated and recharged to spec. Depending on market/build, the CR‑V runs R‑1234yf (in many late‑model vehicles) or R‑134a, always verify the under‑bonnet label. Access varies by trim and market: some workshops can reach the valve near the evaporator connections, while others may need partial HVAC case access inside the cabin. Expect labour to vary accordingly.

Good practice when the circuit has been opened includes:

• Replacing all disturbed O‑rings and using the correct refrigerant oil type and quantity
• Leak‑testing with nitrogen and vacuum hold before charging
• Considering the receiver‑drier/desiccant (often integrated in the condenser) if the system’s been exposed

Owners can help the TXV live a long life by keeping the condenser clean, running the air‑con regularly year‑round to circulate oil, and organising prompt repairs if cooling performance drops. Given the refrigerant handling rules in Australia and New Zealand (ARCtick requirements apply), a qualified technician should carry out diagnosis and repair.

Popular questions about the 2018 Honda CR‑V TX valve

Where is the TX valve located on a 2018 CR‑V?
It’s mounted at the evaporator inlet, where the two A/C lines enter the HVAC box. Depending on market and exact trim, access may be from the engine bay at the bulkhead or from within the cabin near the evaporator housing.

How do I know if my TX valve is failing?
Tell‑tales include poor cooling at idle, intermittent cold air, frost on lines, or odd pressure readings during a gauge test. A proper diagnosis involves temperature and pressure checks, it’s best left to a licensed air‑con tech.

Do I need to replace the TX valve during every A/C service?
No. It’s not a scheduled item. Replace it only if it’s faulty or contaminated, or when major A/C work warrants it. Always use new O‑rings and the correct refrigerant and oil when the system is opened.