Parts for your 2000 Daihatsu Gran move-Tx valve

2000 Daihatsu Gran Move TX‑Valve: What It Does and When to Sort It

Technical documentation confirms the 2000 Daihatsu Gran Move is built with a thermostatic expansion valve (TX‑valve) in its HFC‑134a air‑conditioning system, not an orifice tube. Sources include the Daihatsu Gran Move/Pyzar workshop manual (G3 series, Air Conditioning section) describing the evaporator assembly with a TX‑valve and receiver‑drier layout, the Daihatsu Electronic Parts Catalogue (EPC) for G3‑series Gran Move listing “Expansion Valve, Cooler” for the evaporator inlet, and OEM‑supplier catalogues (e.g., DENSO and Nissens) that provide a dedicated TX‑valve for 1996–2002 Gran Move/Pyzar applications.

On the 2000 Gran Move, the TX‑valve meters refrigerant into the evaporator based on temperature and pressure feedback, keeping superheat in the sweet spot so the cabin gets reliably cold without icing up. It’s a precision bit of kit that balances performance and compressor protection. When the valve sticks or drifts off‑spec, drivers often notice weak cooling at idle, erratic vent temps, or the system cycling more than it should.

Because the A/C circuit is sealed and regulated, TX‑valve work should be handled by a licensed tech. In Australia and New Zealand, that means proper recovery of refrigerant, leak‑free reassembly with new O‑rings, and a vacuum and recharge by weight using the Gran Move’s specified R134a and PAG oil listed on the under‑bonnet label or in the workshop manual.

Replacement usually happens at the evaporator inlet inside the HVAC case. Good practice when the system is opened:

• Replace the receiver‑drier and any disturbed O‑rings.
• Insulate or correctly position the sensing bulb (where fitted) and ensure the TX‑valve is torqued to spec.
• Flush lines and condenser if there’s been compressor failure, then evacuate for sufficient time to remove moisture.
• Recharge by weight and verify pressures, vent temps, and superheat.

Typical warning signs that point to a crook TX‑valve include a frosty or icing evaporator core, high head pressure with a starved evaporator, hissing or chatter at the firewall area, and slow cabin pull‑down on warm days. Of course, similar symptoms can come from low refrigerant, a blocked drier, or a weak condenser fan, so a proper diagnosis with gauges and temperature readings is the smart move.

Look after the Gran Move’s TX‑valve by keeping the system clean, dry, and correctly charged. If the dash needs to come out for heater core work, it’s a convenient time to replace the valve preventatively—small part, big peace of mind for summer drives.

Does the 2000 Daihatsu Gran Move use a TX‑valve or an orifice tube?
It uses a TX‑valve with a receiver‑drier, not an orifice tube and accumulator. That’s how refrigerant flow is precisely controlled in this model to protect the compressor and stabilise evaporator temperature.

What are the common signs the Gran Move’s TX‑valve is failing?
Slow cooling at idle, evaporator icing, rapid compressor cycling, hissing at the firewall, or abnormal gauge readings (very low suction, high discharge) are classic clues. A licensed A/C tech can confirm with pressure and temperature tests.

Can a sticking TX‑valve be cleaned, or should it be replaced?
If contamination or moisture caused the issue, cleaning alone rarely holds. Best practice is to replace the TX‑valve, renew the receiver‑drier, evacuate thoroughly, and recharge by weight. If there was compressor failure, add a full flush and consider a condenser replacement if it’s a parallel‑flow type.