Parts for your 2019 Nissan Serena-Thermostat housing

2019 Nissan Serena Thermostat Housing

Yes, a thermostat housing is used on the 2019 Nissan Serena. Technical sources including the Nissan Electronic Service Manual (C27 series, CO – Cooling System) and the Nissan FAST parts catalogue list a thermostat and a water outlet/thermostat housing for both the MR20DD 2.0 S-HYBRID and the HR12DE e-POWER variants used in 2019. Major aftermarket catalogues for the C27 Serena also carry direct-fit thermostats and housings, confirming its relevance on this model.

On a 2019 Serena, the thermostat housing is the tidy little hub that holds the thermostat and directs coolant flow between the engine and radiator. It helps the engine warm up briskly, then keeps it sitting in the sweet spot for temperature, which means smoother running, better fuel economy and less wear. On modern Serenas—whether the conventional MR20DD or the e-POWER range extender setup—the housing also provides mounting for sensors and seals up the coolant path with an O-ring or gasket.

As part of routine servicing, it’s smart to keep an eye on the housing and its mates. Plastic or alloy housings can warp, crack or seep at the gasket over time, especially if the coolant’s been neglected. If the car’s slow to warm up, runs hot on hills, or leaves a sweet, green-blue puddle under the nose, the housing, thermostat or seals could be the culprit.

• Inspect for staining, crusty deposits, or dampness around the housing and hose joints.
• Replace the thermostat and O-ring/gasket when doing a major cooling system service or if there’s any overheating/underheating fault.
• Use the specified long-life coolant and bleed the system properly to avoid air pockets that can skew temperature readings.
• When refitting, clean the mating surfaces and follow the service manual torque specs to avoid warping.

Plenty of owners choose to replace the thermostat and housing as a matched set to save double-handling. It’s a straightforward job for a competent tech, and it pays off with stable temps and peace of mind—especially important for family hauling and long Kiwi or Aussie road trips in warmer months.

Popular questions about 2019 Nissan Serena thermostat housing

Where is the thermostat housing located on a 2019 Serena?
On MR20DD models, it’s typically mounted at the engine’s coolant outlet side, where the upper radiator hose meets the engine. On e-POWER HR12DE variants, it’s in a similar spot on the engine unit that serves as the generator, with hose routing that makes it easy to spot by following the radiator hose.

Access is usually from the top with some trim or ducting moved aside. A torch helps to see the sensor plugs and clamp positions.

What are common signs the thermostat housing needs replacement?
Look for coolant seepage around the housing, dried crusty residue, or a sweet smell after shutdown. Temperature swings, slow warm-up, or overheating under load can also point to a sticky thermostat or a leaking housing gasket.

If the housing is cracked or warped, replacement is the fix, don’t rely on sealant to band-aid it.

Does the e-POWER Serena also use a thermostat housing?
Yes. Even though drive is electric, the HR12DE engine operates as a generator and still needs a conventional liquid-cooling system, including a thermostat and housing. The function’s the same—control coolant flow and stabilise engine temperature for efficiency and durability.