Parts for your 2007 Honda Elysion-Thermostat housing

2007 Honda Elysion thermostat housing

Based on Honda’s technical literature and parts data, the 2007 Honda Elysion does use a thermostat housing. Honda’s Electronic Parts Catalogue (EPC) for Elysion RR1–RR4 models lists a “water outlet/thermostat” assembly, and Honda service manuals for the K24A (2.4-litre) and J30A (3.0-litre V6) engines detail a removable thermostat located within a dedicated housing. That makes the thermostat housing relevant and fitted on this model.

On the 2007 Elysion, the thermostat housing secures the thermostat and forms a sealed passage for coolant between the engine and radiator. It helps the engine warm up quickly and then keeps temperatures steady by channelling coolant flow as the thermostat opens and shuts. The housing also provides hose connections and sealing surfaces, so it’s a critical part of the cooling system’s reliability.

As part of routine servicing, the housing itself isn’t a scheduled replacement item, but it pays to keep an eye on it whenever coolant is changed. The Elysion’s housing uses an O-ring or gasket that can harden with age, and aluminium castings can pit or corrode if coolant gets neglected. Any sign of crusty coolant stains, seepage at the joint, or a warped mating face is a cue to renew the seal—and replace the housing if it’s damaged.

For owners considering a thermostat or housing replacement, it’s a straightforward job for a competent home mechanic with the right tools, but it does involve draining coolant and bleeding the system afterwards. Use Honda Type 2 long-life coolant (blue), check hose condition, and fit a new thermostat O-ring every time. Clean the mating surfaces, avoid sealant unless the manual specifies it, and torque fasteners evenly to factory specs to prevent leaks or cracking.

• Watch for symptoms: slow warm-up, overheating at speed, heater not blowing hot, or leaks around the housing.
• Replace the thermostat and O-ring preventatively around the 8–10 year or 150–200,000 km mark, or sooner if there are issues.
• After refilling, run the engine with the heater on full hot to purge air, top up the reservoir once the thermostat opens, and recheck the level when cold.

Whether it’s the K24A or J-series V6, a tidy, leak-free thermostat housing helps the Elysion stay bang-on in its ideal temperature zone, saving fuel and protecting the engine on long Kiwi and Aussie road trips.

Popular questions

Where is the thermostat housing on a 2007 Honda Elysion?

On K24A 2.4-litre models it’s bolted to the cylinder head, at the hose connection leading to the radiator. On J30A V6 models it sits at the front of the engine near the lower radiator hose and water pump inlet. It’s the part the main radiator hose clamps to, with the thermostat located inside.

How often should the thermostat or housing be replaced?

They’re generally replaced on condition rather than time, but many owners opt to renew the thermostat and O-ring every 8–10 years or 150–200,000 km. Replace sooner if there are leaks, temperature swings, or slow warm-up.

What coolant should be used, and how is air bled after replacement?

Use Honda Type 2 blue long-life coolant (premixed). After refilling, run the engine with the heater on full hot, gently squeeze the upper hose to help burp air, and top up as the thermostat opens. Recheck the level when cold and inspect for any seepage at the housing.