Parts for your 2000 Honda Stream-Thermostat housing

2000 Honda Stream Thermostat Housing

Yes — the 2000 Honda Stream uses a thermostat housing. Honda’s factory Service Manual for the Stream (2000–2005) identifies the cooling system layout with a dedicated water outlet/thermostat housing assembly. Honda’s Electronic Parts Catalogue (EPC) for RN1/RN2 (D17A 1.7L) and RN3/RN4 (K20A 2.0L) models also lists the housing and its sealing O-ring, plus associated sensors mounted to the outlet. Independent workshop references covering the D17A and K20A engines echo the same arrangement, confirming the housing is a standard, serviceable part on this vehicle.

On the 2000 Honda Stream, the thermostat housing does more than just hold the thermostat. It forms the junction where coolant exits the engine on its way to the radiator, keeps everything sealed under pressure, and often carries the engine coolant temperature sensor. By regulating flow based on coolant temperature, the housing-and-thermostat combo helps the Stream warm up quickly, stay at the right operating temp, and deliver proper heater performance on chilly mornings.

As part of routine servicing, it’s smart to inspect the housing each time coolant is changed. Look for dried pink/white residue, fresh coolant staining, or corrosion around the hose neck and bolt flanges. The Honda alloy casting is robust, but age, old coolant, or overtightened clamps can cause pitting or hairline leaks. If the thermostat is being replaced, fit a fresh O-ring and clean the mating surfaces, sealant is generally not required on an O-ringed Honda housing. When refitting, nip the bolts up evenly to the spec in the workshop manual (commonly around 9–12 N·m for the small bolts) to avoid warping the flange.

Typical signs the housing or thermostat needs attention include:

• Overheating, or very slow warm-up and a heater that never quite gets hot
• Erratic temp gauge readings, or coolant weeping at the housing neck
• Hose that’s collapsed or ballooned at the outlet, suggesting pressure or flow issues

Whenever the housing is disturbed, bleed the cooling system properly: use genuine Honda Type 2 coolant (or an equivalent silicate-free premix), set the heater to hot, run the engine until the fans cycle, and top up the radiator and overflow. On the D17A Stream, the housing sits near the lower radiator hose connection at the front/side of the engine, on the K20A it’s mounted toward the gearbox side. A quick visual check during services can save a cooked head gasket and keep the Stream happily commuting around Aussie and Kiwi roads.

Popular questions about 2000 Honda Stream thermostat housing

Where is the thermostat housing located on a 2000 Honda Stream?
The D17A (1.7L) models place the housing at the lower radiator hose connection on the front/side of the engine. K20A (2.0L) models mount it toward the rear/gearbox side. Either way, follow the lower radiator hose back to the engine — it mates to the housing.

What coolant should be used after replacing the thermostat housing?
Use Honda Type 2 premixed coolant (blue) or an equivalent silicate-free coolant mixed 50/50 with demineralised water. After refilling, bleed the system with the heater on hot and top up once the fans have cycled.

Do the housing bolts need a specific torque?
Yes. The housing uses small fasteners into alloy, so avoid overtightening. A typical Honda spec is roughly 9–12 N·m. Always check the Stream’s service manual for the exact torque for your engine variant.