Parts for your 2009 Suzuki Splash-Tx valve

2009 Suzuki Splash tx-valve — what it does and when to service it

Referencing OEM material, the 2009 Suzuki Splash is fitted with a thermal expansion valve (TX valve). Suzuki’s Electronic Parts Catalogue for Splash/Ritz models lists a “Valve Assy, Expansion” at the evaporator joint, and the sister vehicle’s Vauxhall/Opel Agila B EPC also specifies a “refrigerant expansion valve.” DENSO HVAC service literature for small hatchback platforms of this era shows a block‑type TX valve at the evaporator with a condenser/drier module, confirming the Splash uses a TX valve rather than a fixed orifice tube.

On a 2009 Suzuki Splash, the tx-valve is the metering brain of the air‑con. It regulates how much liquid refrigerant enters the evaporator, based on outlet temperature and pressure, so the evaporator runs cold without icing up. That means steadier cabin temps, better demist performance on wet mornings, and less compressor strain when you’re crawling through traffic or belting up the motorway.

There’s no routine maintenance just for the tx-valve, but it lives and dies by system cleanliness and correct charge. During regular A/C servicing (every 2 years is a good rhythm in Aussie and Kiwi conditions), a licensed tech should recover and weigh the gas, vacuum-test for moisture and leaks, and recharge to the exact weight on the under‑bonnet label. They’ll also check condenser airflow, the cabin filter, and fan operation—simple issues that can make a good valve look crook.

If the Splash’s tx-valve is on the way out, the signs are pretty telling:

• Weak or erratic cooling, especially temp swings at the vents
• Frosting near the firewall/evaporator connections or the valve body
• Unusually high or low gauge readings and rapid compressor cycling
• Audible hissing at the evaporator area and poor low‑speed performance

Replacement is a professional job. The refrigerant must be safely recovered, the lines at the firewall unbolted, and new O‑rings and insulation installed with the block‑type valve at the evaporator. Best practice from OEM and DENSO guides is to replace the receiver‑drier any time the system’s opened, pull a deep vacuum to boil out moisture, then recharge by weight—not “until it’s cold.” Flushing is for lines and the condenser only if contamination is proven, a tx-valve itself isn’t flushable. Done right, a fresh valve and drier restore crisp, reliable cooling with no dramas.

A couple of tips to keep the Splash’s TX valve happy long‑term: run the A/C for 10–15 minutes weekly year‑round to keep seals lubricated, keep the condenser fins clear of bugs and road grime, and change the cabin filter on schedule so airflow across the evaporator stays healthy.

Popular questions

Where is the tx-valve on a 2009 Suzuki Splash?
The Splash uses a block‑type TX valve mounted at the evaporator connections by the firewall. On most cars it’s accessible from the engine bay at the two A/C pipes entering the cabin, or from behind the dash HVAC case if deeper access is needed.

It’s usually wrapped in insulation. If you see frosting or oily residue there, that’s a hint the valve or its O‑rings need attention.

What symptoms point to a failing tx-valve on a Splash?
Look for weak or intermittent cooling, noticeable temperature swings at the vents, frosting at the firewall fittings, and rapid compressor cycling. Manifold gauges may show low low‑side with starved evaporator, or an overfed, icing evaporator depending on the failure.

Rule out easy stuff first—blocked cabin filter, dirty condenser, or a low refrigerant charge—before condemning the valve.

Should the receiver‑drier be replaced when changing the tx-valve?
Yes. OEM and A/C trade guidance recommend renewing the drier any time the system is opened to atmosphere. It traps moisture and debris that would otherwise shorten the life of the new valve and the compressor.

Fit new O‑rings, pull a deep vacuum, and recharge to the exact spec on the vehicle label for best results.