Parts for your 2015 Mazda Cx-5-Tx valve

2015 Mazda CX-5 TX valve: what it does and when to sort it

Based on technical references, the 2015 Mazda CX-5 does use a thermal expansion valve (TX valve/TXV) in its air‑conditioning system. The Mazda Workshop Manual for the 2013–2016 CX‑5 HVAC section identifies a block‑type expansion valve fitted at the evaporator connections, and Mazda’s electronic parts catalogues list an expansion valve for this model. Industry A/C guides for variable‑displacement compressor systems (as used on the CX‑5) also specify a TXV rather than an orifice tube arrangement. So yes—this vehicle is TXV‑equipped.

The TX valve is the metering brain of the air‑con. It controls how much refrigerant enters the evaporator based on temperature and pressure (superheat), keeping the CX‑5’s cabin cool without icing the evaporator or starving it of flow. When it’s healthy, vent temps stay steady, demist works a treat, and the compressor isn’t overworked.

Typical TXV trouble shows up as fluctuating vent temperatures, weak cooling at idle, frost on the evaporator lines, hissing at the firewall, or odd high/low side pressures on the gauges. Because debris and moisture are the usual culprits, a crook TX valve often follows a compressor failure or a system that’s been left open to air.

Servicing advice for a 2015 CX‑5 is straight‑up: the TX valve isn’t a routine replacement item, but it should be inspected whenever the system is opened. If the compressor is being replaced, it’s smart practice to replace the TXV and renew the receiver/drier or desiccant element at the same time to protect the fresh components. Access is at the evaporator connections near the bulkhead, depending on market and engine bay layout, trims or the cowl panel may need to come off for room.

Any TXV replacement must be done with proper A/C procedures: recover the refrigerant, cap lines to keep moisture out, renew O‑rings, torque to spec from the workshop manual, evacuate thoroughly, and recharge by weight to the label under the bonnet. Use the manufacturer‑specified PAG oil type and quantity. After re‑gassing, check for leaks (UV dye or nitrogen/trace gas), confirm stable low vent temps, and verify that pressures track normally with engine speed and fan settings.

• Keep the cabin filter clean to help airflow over the evaporator.
• Run the air‑con regularly year‑round to circulate oil and keep seals supple.
• If the system’s contaminated, insist on flushing lines and replacing the desiccant along with the TXV.

FAQs

Does the 2015 Mazda CX‑5 use a TX valve or an orifice tube?
It uses a TX valve. Mazda’s service information for the 2013–2016 CX‑5 HVAC system specifies a block‑type thermal expansion valve at the evaporator, not an orifice tube.

Where is the TX valve located on a 2015 CX‑5?
It’s mounted at the evaporator inlet/outlet at the bulkhead area. Access is typically from the engine bay, on some versions you may need to remove the cowl panel for better reach.

Do you have to re‑gas after replacing the TX valve?
Yes. The system must be recovered, evacuated, and then recharged by weight to the spec on the under‑bonnet label. Skipping this step risks poor cooling and compressor damage.