Parts for your 2017 Nissan Serena-Thermostat housing

2017 Nissan Serena Thermostat Housing

Based on technical references, the 2017 Nissan Serena does use a thermostat and thermostat housing. The Nissan C27 Serena Service Manual (Cooling System – CO section) details a thermostat and water outlet housing for the MR20DD 2.0‑litre engine and the HR12 series engine used in e‑POWER models. Nissan parts catalogues for the C27 also list a thermostat/water outlet assembly for these engines, confirming the component is fitted from factory.

The thermostat housing on a 2017 Serena does a simple but crucial job: it holds the thermostat in place and channels coolant between the engine and the radiator. By regulating when coolant flows (generally around the mid‑80s °C), it helps the MR20DD petrol or HR12 e‑POWER generator engine warm up quickly, stay at the sweet‑spot temperature, and keep cabin heat working properly. If the housing warps, leaks, or the thermostat inside it sticks, you can cop overheating, sluggish warm‑up, or annoying coolant dribbles on the driveway.

As part of regular servicing, it’s smart to cast an eye over the housing and nearby hose joints. Look for dried coolant crust, pink/blue staining, or a faint sweet odour after a drive. A cold upper radiator hose that stays cold well into warm‑up, or a temp gauge that yo‑yos, can hint at thermostat trouble inside the housing.

• Symptoms worth checking: coolant seepage at the housing seam, brittle plastic spigots, swollen hoses at the outlet, slow heater performance, or rising temps in traffic.
• Preventative care: refresh coolant on schedule and use the correct spec (Nissan Genuine Long Life Coolant – Blue, or an equivalent silicate‑free OAT/PHOAT). Avoid tap water, use demineralised water if mixing concentrate.

If replacement’s on the cards, most Serenas use an integrated thermostat-and-housing assembly. Plan on new O‑rings/gaskets and fresh hose clamps. Work on a cool engine, catch and dispose of old coolant responsibly, and torque the housing bolts evenly to spec to avoid warping. After refit, bleed the system: heater on HOT, run the engine, squeeze the upper hose to burp air, and top up the reservoir to the mark. Keep an eye on the level and any weeps over the next few drives.

There’s no hard‑and‑fast replacement interval, but after 8–12 years or higher kilometres, plastic housings can get a bit brittle. If you’re already doing a radiator, water pump, or major cooling service, doing the thermostat housing at the same time is tidy insurance.

FAQs

Where is the thermostat housing on a 2017 Nissan Serena?
On MR20DD models it’s at the front of the engine, where the upper radiator hose meets the engine. On e‑POWER versions, it’s mounted on the HR12 generator engine, again at the main coolant outlet.

What coolant should be used after replacing the thermostat housing?
Use Nissan Genuine Long Life Coolant (Blue) or an equivalent meeting the same spec. If using concentrate, mix with demineralised water to a 50/50 ratio unless your climate or product label specifies otherwise.

Is the thermostat separate from the housing on the Serena?
Most 2017 Serena variants use an integrated assembly where the thermostat sits inside the outlet housing. It’s common practice to replace the assembly as a unit along with the sealing O‑ring.