Parts for your 2014 Mazda Cx-5-Tx valve

2014 Mazda CX-5 TX Valve (Thermal Expansion Valve)

Technical sources including the Mazda Workshop Manual for the 2013–2016 CX-5 HVAC section (Expansion Valve removal/installation) and DENSO HVAC service literature confirm the 2014 Mazda CX-5 uses a thermostatic expansion valve (TXV) at the evaporator inlet, not an orifice tube. OEM and aftermarket parts catalogues for 2014 CX-5 air-conditioning components likewise list a block-type expansion valve specific to this model.

On a 2014 Mazda CX-5, the TX valve meters refrigerant into the evaporator based on evaporator outlet temperature and pressure, keeping superheat in check so the cabin cools quickly without flooding the compressor. It’s a compact block bolted to the evaporator pipes at the heater/evaporator case, with the lines passing through the firewall. When the TXV sticks or mis-meters, drivers see weak cooling at idle, fluctuating vent temps, frosting on the evaporator or lines, or compressor cycling that feels odd. Left alone, it can stress the compressor.

For servicing, it’s a straightforward part but not a DIY job—refrigerant recovery and re-gassing must be done by a licensed air-con tech (ARCtick in Australia, approved refrigerant handlers in NZ). A proper repair will include: recovering the refrigerant, removing the cowl/dash trims as needed for access, unbolting the valve, replacing all O-rings with new HNBR items lightly lubricated with the correct compressor oil, and refitting with clean, lint-free practices. Because the CX-5 condenser typically houses the desiccant, workshops will assess the need to replace the desiccant bag or condenser if the system’s been open or contaminated. After assembly, they’ll evacuate the system to deep vacuum, perform a decay test, then charge to the under-bonnet specification with the correct oil type and quantity shown on the vehicle label.

Smart owners schedule TXV attention when the glove box or HVAC case is already being accessed—for example, during evaporator core or heater work—saving labour. Preventative maintenance is simple: keep the cabin filter fresh so airflow across the evaporator stays stable, run the air-con regularly year-round to circulate oil, and have an A/C performance and leak check done if cooling drops off. If the system’s been empty, insist on leak detection before any “re-gas”. Done right, a quality TX valve will deliver crisp, consistent cooling in Aussie and Kiwi summers without fuss.

• Common symptoms of a failing TXV: uneven cooling, iced lines/evaporator, noisy hissing at the dash, short-cycling compressor, or poor idle performance.
• Best practice: new O-rings, correct oil, vacuum and leak test, and charge to the label spec by a licensed technician.

FAQs

Does the 2014 Mazda CX-5 use a TX valve or an orifice tube?
The 2014 CX-5 uses a thermostatic expansion valve at the evaporator, not an orifice tube. This is documented in Mazda’s workshop procedures for the HVAC system and reflected in DENSO parts listings for this model.

What are the signs the TX valve needs replacing on a CX-5?
Weak or inconsistent cooling, icing on the evaporator/lines, fluctuating vent temps, and odd compressor cycling are the big giveaways. A technician can confirm with pressure readings and temperature checks across the valve.

Do you need to re-gas the air-con after replacing the TX valve?
Yes. The system must be recovered, evacuated, leak-tested, and recharged to the under-bonnet specification with the correct refrigerant and oil. The exact charge and oil type are on the vehicle’s A/C label, your licensed tech will follow those specs.