Parts for your 2014 Holden Captiva 5-Radiator cap

2014 Holden Captiva 5 radiator cap — is there actually one?

Short answer: there’s no traditional radiator cap on the 2014 Holden Captiva 5’s radiator. This model uses a sealed radiator and a remote, pressurised surge/expansion tank with the pressure cap fitted to that tank. So a “radiator-cap” as a separate item on the radiator itself isn’t relevant on the Captiva 5, the correct part is the coolant reservoir (surge tank) pressure cap.

That setup is confirmed across technical references for this platform, including: the Holden Captiva CG Series II Owner’s Manual (Cooling System section), GM Service Information for Chevrolet Captiva Sport/Opel Antara “Cooling System — Description and Operation”, and GM/Holden parts catalogues that show a cap on the surge tank and no filler neck on the radiator. These documents describe filling and bleeding the system via the surge tank only, which is fitted with the pressure cap.

Why the radiator-cap isn’t used on the Captiva 5 comes down to how modern GM cooling systems are engineered:

• A sealed radiator with a high-mounted surge/degassing tank helps purge air continuously, reducing hot spots and improving reliability.
• Fewer joints on the radiator (no neck or cap seat) means fewer potential leak points and better packaging for crash and airflow performance.
• Servicing is simpler: all filling, checking, and cap-related pressure control happens at the surge tank — the highest point in the system.

For owners and workshops, the practical takeaway is to treat the surge tank pressure cap as the service item that does the “radiator-cap” job. If there are signs of coolant loss, overflowing, collapsed hoses after cool-down, or overheating with no visible leaks, a weak or faulty surge tank cap could be part of the problem. Use an OE-spec cap with the correct rating (commonly around 140 kPa/20 psi — confirm by VIN or the marking on the original cap), and only remove it when the engine is cold. Top-up and bleeding are done via the surge tank, using the correct long-life Dex-Cool–type OAT coolant specified by Holden/GM.

Bottom line: the 2014 Holden Captiva 5 doesn’t use a separate radiator-cap on the radiator. It relies on a pressurised surge tank cap to maintain system pressure, manage expansion, and allow safe service access.

Popular questions

Does the 2014 Holden Captiva 5 have a radiator cap?
It doesn’t have a cap on the radiator. The pressure cap is on the coolant surge/expansion tank. That’s where filling and pressure control occur.

What pressure cap does a Captiva 5 use?
Most use a cap around 140 kPa (20 psi), but always check the original cap’s marking or parts data against the VIN to be sure you’re matching the correct specification.

How do you top up coolant on a Captiva 5?
Only when the engine is cold, open the surge tank cap and top up to the mark with the correct Holden/GM long-life Dex-Cool–type OAT coolant mix. Do not attempt to fill via the radiator — it has no filler neck.