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