Parts for your 2013 Honda Stream-Thermostat

2013 Honda Stream Thermostat — Purpose, Care, and When to Replace

Yes — a thermostat is fitted and relevant on the 2013 Honda Stream. This is confirmed by Honda’s technical literature: the Honda Stream (RN6–RN9) Service Manual includes Cooling System procedures for thermostat inspection and replacement, the Honda Electronic Parts Catalogue lists a coolant thermostat and gasket for RN6–RN9 models with the R18A 1.8‑litre and R20A 2.0‑litre engines, and Honda diagnostic guidance for DTC P0128 (coolant temperature below regulating temperature) references thermostat function on these engines.

On the 2013 Honda Stream, the thermostat’s job is to help the engine warm up quickly, then hold it in that sweet spot around the low‑to‑mid‑80s °C under most conditions. It stays shut when cold to speed warm‑up (better fuel economy and heater performance), then opens to circulate coolant through the radiator to control temperature. If it sticks open, the Stream runs cool, the heater’s lukewarm, fuel use can creep up, and a P0128 fault may log. If it sticks shut, overheating can happen fast — not something anyone wants under the bonnet.

Thermostats aren’t a scheduled replacement item on the Stream, they’re replaced when symptoms show or if there’s evidence of age‑related sticking, corrosion, or after an overheat. Using genuine‑spec parts and Honda Type 2 blue long‑life coolant helps keep things drama‑free. When replacing, most techs also fit a new O‑ring/gasket and inspect the housing for pitting.

1. Let the engine cool fully, then drain enough coolant to drop the level below the thermostat housing.
2. Remove intake ducting as needed, then the housing. Note the thermostat’s orientation — the jiggle valve typically sits at the 12 o’clock position.
3. Clean the mating faces, fit the new thermostat and O‑ring, and tighten the housing bolts evenly to the service‑manual spec.
4. Refill with Honda Type 2 coolant (premix) and bleed air: set the heater to hot, run the engine until the fans cycle, and top up as bubbles purge.
5. Check for leaks and verify steady operating temperature on a road test.

Good clues it’s time to sort the thermostat on a 2013 Stream include slow warm‑up, temperature gauge wandering, poor cabin heat, fans running more than usual, or any coolant temp fault code. If those pop up, it’s worth getting the thermostat inspected and replaced before bigger cooling headaches show up.

FAQs

What are the common signs the 2013 Honda Stream thermostat is failing?
Typical signs are slow warm‑up, lukewarm heater air while driving, fluctuating temp gauge, a check‑engine light with P0128, or overheating if the valve sticks shut. Any of these warrant an inspection and likely replacement.

Do I need Honda Type 2 coolant when changing the thermostat?
Yes, it’s strongly recommended. Honda Type 2 (blue) long‑life coolant protects aluminium components, helps prevent corrosion and deposits, and keeps the thermostat and water pump happy. Mixing coolants can reduce protection.

Is the thermostat a routine service item on the 2013 Stream?
No, it’s replaced on condition. Many last years, but age, contaminated coolant, or an overheat can shorten their life. If you’re refreshing hoses or a water pump, it’s smart to do the thermostat at the same time.