Parts for your 2008 Honda Elysion-Thermostat

2008 Honda Elysion Thermostat — purpose, servicing and replacement tips

Yes, the 2008 Honda Elysion absolutely uses a conventional engine coolant thermostat. This is confirmed by Honda technical documentation for the Elysion (RR1/RR2/RR3) cooling system and the Honda electronic parts catalogue, which list a thermostat assembly for both the 2.4L K24A four‑cylinder and the J-series V6. Honda service data specifies a wax‑pellet thermostat that begins to open around 78–82°C and is fully open by roughly 95°C, mounted in the water inlet/thermostat housing on the engine. These details align with Honda engine manuals for K24A/J30A platforms.

On the Elysion, the thermostat’s job is to help the engine warm up quickly, then hold operating temperature steady. That keeps emissions clean, fuel economy on point, and gives reliable cabin heat on chilly mornings. Once warm, the system targets roughly the high‑80s to low‑90s °C under normal cruising.

It’s not a scheduled replacement item, but with age and kilometres it can stick open (cool running, sluggish heater, possible P0128 code) or stick shut (overheating, rapid temp spikes). Many workshops will replace the thermostat proactively when doing cooling system work like a water pump or radiator replacement, especially on vehicles 10+ years old.

For replacement and maintenance on a 2008 Honda Elysion thermostat, a few practical tips help avoid grief:

• Use a genuine‑spec thermostat and new seal, choose the correct temperature rating (Honda spec 78–82°C opening).
• Fit it with the jiggle pin/air bleed at the 12 o’clock position to purge air properly.
• Refill with Honda Type 2 (blue) premixed coolant and bleed air: heater on hot, engine idling until the fans cycle twice, use the bleed screw if fitted.
• Torque the housing bolts to factory spec (around 12 N·m for most Honda K and J engines). Check current service data for the exact figure.
• After a short drive, recheck coolant level and inspect for leaks at the housing and hoses.

Location notes: on K24A models the thermostat sits at the end of the lower radiator hose on the transmission side of the block. On the V6, it’s integrated near the water pump area. Both layouts are straightforward with basic tools, but tight spaces may favour removing nearby intake ducting for access.

Popular questions

Where is the thermostat on a 2008 Honda Elysion?
On the 2.4L K24A it’s in the water inlet at the end of the lower radiator hose, mounted to the block. On the V6 it’s in the thermostat housing near the water pump/front bank. Expect to drain some coolant and move a few hoses for access.

What temperature should the Elysion’s thermostat be?
Honda specifies a thermostat that starts opening around 78–82°C and is fully open by about 95°C. In normal driving the gauge should sit steady once warm, with coolant temp typically in the high‑80s to low‑90s °C.

Should the thermostat be replaced as routine maintenance?
It’s not a scheduled item. Replace it if there are symptoms (overheating, slow warm‑up, heater underperforming, P0128) or when doing major cooling work. Many owners choose to renew it preventively after a decade or when replacing the water pump and hoses.