Parts for your 2019 Haval H6-Tx valve

2019 Haval H6 TX valve: what it does, why it matters, and how to look after it

Based on the Haval/GWM H6 Workshop Manual (HVAC section covering the Evaporator and Expansion Valve), the GWM Electronic Parts Catalogue listings for “Expansion Valve Assy” on 2017–2020 H6 models, and dealer HVAC circuit diagrams for the platform’s variable‑displacement compressor setup, the 2019 Haval H6 is fitted with a thermostatic expansion valve (TX valve) at the evaporator inlet. So yes—this part is relevant to the 2019 H6.

The TX valve is the metering brain of the H6’s air‑con. It regulates how much liquid refrigerant enters the evaporator, reacting to outlet temperature and pressure to keep superheat in the sweet spot. Get it right and occupants enjoy fast pull‑down on a stinking hot day, stable vent temps, and no icing. When a TX valve sticks or drifts out of spec, the H6 can blow warm at idle, surge cold then warm, short‑cycle the compressor, or show frost on the small (liquid) line near the firewall.

There’s no routine replacement interval for a TX valve on a healthy system. During regular servicing, a tech should check vent temps, pressure behaviour, cabin filter condition, condenser cleanliness, and look for dye or oil traces at joints. Running the A/C for a few minutes every week helps keep seals supple and the valve happy.

Replacement is usually only on fault, contamination, or after major component failure. On the H6, the TX valve is mounted at the evaporator, so expect dash‑side access. Best practice when replacing it includes:

• Recovering refrigerant with licenced equipment (AU/NZ regulations apply).
• Replacing O‑rings and lightly lubricating with the correct PAG oil.
• Assessing and, if required, replacing the receiver‑drier element (often integrated with the condenser on modern H6 variants) to protect the fresh valve from moisture and debris.
• Evacuating the system with a proper vacuum, then recharging by weight to the H6 specification.
• Verifying superheat and vent temps, scanning for HVAC control faults if performance is still off.

DIY attempts can easily introduce air or dirt, which a TX valve hates. For owners in Australia and New Zealand, leaving recovery, re‑gassing, and valve swaps to an ARCtick‑authorised or equivalently licenced A/C technician is the smart move. Treated right, the H6’s TX valve quietly keeps the cabin comfy for years.

Popular questions about 2019 Haval H6 TX valves

Does a 2019 Haval H6 use a TX valve or an orifice tube?
The 2019 H6 uses a thermostatic expansion valve at the evaporator inlet, not a fixed orifice tube. This suits its variable‑displacement compressor and helps deliver stable cabin temps across changing load and speed.

What are common symptoms of a failing TX valve on a 2019 H6?
Warm air at idle, cold–warm surging, compressor short‑cycling, line frosting near the firewall, and uneven vent temps are typical clues. A proper gauge set and temperature checks will confirm whether metering or another HVAC component is at fault.

Should the drier be replaced when changing the TX valve?
Yes, if the system has been opened or there’s been a failure, replacing the receiver‑drier (or the integrated drier element in the condenser, if so equipped) is recommended. It safeguards the new valve by trapping moisture and debris.