Parts for your 2018 Haval H6-Thermostat housing

2018 Haval H6 Thermostat Housing: What it is, why it matters, and how to look after it

Based on technical references, the 2018 Haval H6 does use a thermostat housing. The H6’s turbo-petrol engines (commonly the GW4G15B 1.5T and GW4C20B 2.0T for this model year) place the thermostat in an integrated, composite housing mounted to the engine’s coolant outlet. This setup is shown in Great Wall Motors/Haval service literature for the H6 cooling system (2017–2018 editions), the GWM electronic parts catalogue for H6 applications, and is supported by listings from mainstream aftermarket catalogues used in AU/NZ workshops (e.g., Tridon Australia and Gates). In short, a thermostat housing is relevant and fitted to the 2018 Haval H6.

The thermostat housing on a 2018 Haval H6 is the little command centre for engine temperature. It holds the thermostat that meters coolant flow so the engine warms up quickly, then stays in its sweet spot once on the move. On the H6, it’s a compact plastic (composite) assembly that also ties in the upper radiator hose and usually a coolant temperature sensor. When it’s healthy, warm-ups are quick, cabin heat comes on promptly, and the gauge stays steady on long slogs and summer traffic alike.

With age and heat cycles, plastic housings can warp or crack and O-rings go hard. That’s when owners may spot a sweet coolant smell, dampness under the bonnet, or a crusty pink/white stain around the hose neck or seam. Other giveaways include slow warm-up, erratic temps, or the ECU tossing a P0128-style fault for coolant temperature below thermostat regulating temperature. If any of that sounds familiar, it’s time for an inspection.

Replacement is straightforward for a competent home spanner-turner but is often bundled into workshop servicing. The job typically involves draining enough coolant to sit below housing level, removing intake ducting for access, unclipping the temp sensor connector, loosening the hose clamp, and unbolting the housing. Best practice on the H6 is to fit a complete assembly (thermostat + housing) with a fresh seal/O-ring rather than reusing old bits. Avoid sealant unless the service manual explicitly calls for it, a light smear of silicone grease on the O-ring helps it seat nicely.

• Refill with the exact coolant type specified in the owner’s manual and bleed the system properly: heater on hot, engine idling, top up as air purges, and confirm the fans cycle normally.
• Check for leaks over the next few drives and recheck the expansion tank level.
• As part of regular servicing, cast an eye over the housing and hose junctions every 10,000–15,000 kilometres or at each service interval.

Handled this way, the H6’s thermostat housing will keep coolant flow on point, help fuel economy, and keep the turbo four happy across Aussie and Kiwi conditions.

Popular questions about the 2018 Haval H6 thermostat housing

Where is the thermostat housing on a 2018 Haval H6?
It’s mounted on the engine’s coolant outlet, where the upper radiator hose connects to the engine. Look for a black composite housing with a hose neck and an electrical plug for the temperature sensor. Access can be a bit tighter on some variants due to intake plumbing, but it’s visible from the top once covers are off.

Do I need to replace the whole housing or just the thermostat?
For this model, the thermostat is typically supplied as an integrated assembly with the housing. Replacing the whole unit with a new seal is the reliable, time-efficient fix and helps prevent repeat leaks from aged plastic or a tired O-ring.

What symptoms point to a failing thermostat housing on an H6?
Coolant smell, visible seepage or crusting around the housing, unexplained coolant loss, overheating, slow warm-up, unstable temperature readings, or a coolant temperature fault code are the usual suspects. Any of these warrant a pressure test and a close look at the housing and hose junctions.