Parts for your 2020 Haval H6-Radiator cap

2020 Haval H6 radiator cap: is there one?

For the 2020 Haval H6, a traditional radiator cap on the radiator itself isn’t used. This model runs a sealed, pressurised cooling system with a remote expansion (degas) tank. The pressure cap lives on that plastic coolant reservoir under the bonnet, not on the radiator. So if someone’s searching for a “radiator cap” for a 2020 H6, what they actually need is the coolant reservoir pressure cap.

Technical sources that back this up include the Haval H6 Owner’s Manual (2017–2020), which directs coolant top-up via the reservoir and warns against opening the reservoir cap when hot, the GWM/Haval Workshop Manual for the GW4B15/GW4C20 engines, which shows a degassing-type cooling layout with a remote pressure cap, and the GWM/Haval Electronic Parts Catalogue for the same generation, which lists an Expansion Tank Cap and a radiator without a filler neck.

Why the change from an old-school radiator cap to a reservoir cap? It’s all about better packaging and reliability:

• Higher fill point: The expansion tank sits at the highest point, making bleeding air easier and keeping the system stable.
• Continuous degassing: Air separates into the tank while driving, improving cooling performance.
• Safety: No hot cap on the radiator up front, less scald risk when checking coolant.
• Packaging and durability: A sealed radiator simplifies the front-end design and reduces leak points.

Maintenance-wise, the reservoir cap does the same pressure-control job a radiator cap used to do. If the H6 is losing coolant, running hot, or the top hose feels soft when it should be firm, the cap could be weak. Check the rubber seals for cracks or flattening, make sure the spring action feels positive, and replace the cap if there’s any doubt. Always match the correct pressure rating and cap style for the H6’s engine variant, and never crack the cap when the engine’s hot—let it cool right down first. A fresh cap is inexpensive insurance against overheating, hose collapse, and premature water pump or heater core drama.

Technical references (no external links provided):

• Haval H6 Owner’s Manual (2017–2020), Cooling System section: top-up via coolant reservoir, do not open reservoir cap when hot.
• GWM/Haval Workshop Manual (GW4B15/GW4C20 engines), Engine Cooling System: degas/expansion tank with pressure cap, radiator has no filler neck.
• GWM/Haval Electronic Parts Catalogue (2017–2020 H6): lists Expansion Tank Cap, radiator assembly shown as sealed.

Popular questions about the 2020 Haval H6 radiator cap

Does the 2020 Haval H6 have a radiator cap?
It doesn’t have a cap on the radiator. The system uses a pressurised expansion tank, and the pressure cap is fitted to that tank. If they’re chasing a “radiator cap,” they’ll want the coolant reservoir cap instead.

Where do you add coolant on a 2020 Haval H6?
Coolant is added via the plastic expansion tank under the bonnet. Only top up when the engine is cold, use the correct OAT/HOAT coolant spec recommended by Haval, and fill to the COLD mark on the tank.

When should the H6’s reservoir cap be replaced?
If there are signs of coolant weeping around the cap, the rubber seals look perished, the spring action feels weak, or the vehicle shows intermittent overheating or hose collapse after cool-down. Many owners replace the cap preventatively around major cooling service intervals.