Parts for your 2014 Mazda Premacy-Tx valve

2014 Mazda Premacy TX Valve: What It Does, Where It Lives, and When to Replace It

Technical sources confirm the 2014 Mazda Premacy (CW series) uses a TX valve (thermal expansion valve) in its DENSO air‑conditioning system. The Mazda Workshop Manual for the CW platform details “Expansion Valve Removal/Installation” in the A/C Evaporator section, while the Mazda Electronic Parts Catalogue lists an “Expansion Valve” for this model year. Major aftermarket catalogues from common OE suppliers also list a dedicated expansion valve for 2010–2018 Premacy/Mazda 5, matching the factory setup. So yes—this vehicle is TX‑valve equipped, not an orifice‑tube system.

The TX valve is the brains of the air‑con’s refrigerant flow. It meters how much liquid refrigerant enters the evaporator, keeping the evaporator cold without letting it freeze. By reacting to temperature and pressure at the evaporator outlet, the TX valve maintains the right superheat so the compressor doesn’t get a slug of liquid and the cabin stays comfy on a scorching summer’s day. On the 2014 Premacy, the valve sits at the evaporator connection around the firewall/bulkhead area, depending on build and tooling, access can be from the engine bay or may require glovebox/dash and HVAC case work per the workshop procedure.

There isn’t much “routine maintenance” on the TX valve itself—it’s generally a fit‑and‑forget part until symptoms show. What helps is keeping the cabin filter fresh, running the A/C regularly to circulate oil, and having the system checked by a licensed technician if cooling performance drops. If the A/C is weak at idle but cooler on the move, if there’s frost on the lines, a loud hiss near the firewall, or odd high/low pressure readings, a sticky or restricted TX valve could be the culprit.

• When replacing the TX valve on a Premacy, always have the refrigerant recovered properly (legal requirement in AU/NZ), then renew the O‑rings with the correct material and lightly oil them.
• Follow torque specs and support the pipes with two spanners to avoid stressing the evaporator stubs.
• Keep everything surgically clean—any grit can jam the new valve.
• Evacuate with a vacuum pump for the time specified by the manual, then recharge strictly by weight per the under‑bonnet label.
• If the system’s been open to air, replace the receiver/drier or desiccant (on many Mazdas of this era it’s integrated into the condenser).

Done right, a fresh TX valve restores crisp, consistent cooling and protects the compressor. A quick professional system performance check each service interval is cheap insurance for the Premacy’s air‑con.

Popular questions about the 2014 Mazda Premacy TX valve

Does the 2014 Premacy use a TX valve or an orifice tube?
It uses a TX valve. Mazda’s CW‑series documentation and parts listings specify an expansion valve at the evaporator, not an orifice tube/accumulator setup.

Where is the TX valve located?
At the evaporator connections by the firewall/bulkhead. Actual access can vary, some procedures require glovebox/HVAC case removal from the cabin side. Always follow the Mazda workshop steps for the CW platform.

Should the drier be replaced when changing the TX valve?
Best practice is yes—replace the receiver/drier or desiccant pack whenever the system is opened, especially if it’s been exposed to air. Many models integrate the desiccant into the condenser, so the fix may be a new condenser or a serviceable desiccant bag if available.