Parts for your 2013 Toyota Rav4-Radiator cap

2013 Toyota RAV4 radiator cap — what it does and when to replace it

Yes, a radiator cap is used on the 2013 Toyota RAV4. This is backed by Toyota’s own technical literature: the 2013 RAV4 Owner’s Manual includes warnings about removing the radiator cap only when the engine is cool, the Toyota Repair Manual for the XA40 platform includes an “On‑Vehicle Inspection – Radiator Cap” procedure with a specified relief pressure around 83–113 kPa (0.85–1.15 kgf/cm²), and Toyota’s Electronic Parts Catalogue lists a Radiator Cap Sub‑Assembly for 2013 RAV4 models (commonly referenced as 16401‑31650), confirming it’s a serviceable part.

On this RAV4, the radiator cap isn’t just a lid — it’s a pressure valve that keeps the cooling system sealed to the right pressure. By holding pressure, the coolant’s boiling point is raised, helping the 2.5‑litre petrol or diesel engine run at stable temperatures under Aussie and Kiwi conditions. When pressure gets too high, the cap lets a small amount of coolant move to the overflow bottle, as things cool, it allows coolant to return, keeping the system topped up and air out.

A tired cap can cause annoying issues: slow overheating on hills, a low or fluctuating coolant level, collapsed radiator hoses after cool‑down, or dampness and crusty deposits around the filler neck. Because the cap’s spring and seals age with heat cycles, it’s smart to treat it like a small but important service item.

For servicing, many workshops pressure‑test the cap with a radiator cap tester to check it holds the specified pressure and seals properly. If there’s any doubt — or at major cooling service intervals — replacing the cap with a genuine‑spec, correct‑pressure unit is low‑cost insurance for the head gasket, water pump, and radiator.

• Always check the cap only when the engine is stone cold — under the bonnet, no heat haze, hoses firm but not hot.
• If replacing, match the pressure rating to the factory spec (typically about 1.1 bar/108 kPa for many 2013 RAV4 variants) and ensure the sealing surfaces are clean.
• After any cooling system work, bleed air properly and verify the overflow hose is connected and free of kinks.

Popular questions

Where is the radiator cap on a 2013 RAV4?
It’s mounted on the radiator filler neck near the upper radiator hose in the engine bay. Some market variants route the cap via a surge/fill point close to the radiator top tank, but it serves the same pressure‑control role. If unsure, follow the top hose to the radiator and look for the metal cap with warning labels.

What pressure cap does a 2013 RAV4 use?
Most 2013 RAV4 models specify a cap around 1.1 bar (approximately 108 kPa). Always confirm against the under‑bonnet label or the Owner’s/Repair Manual for the exact engine and market, and replace like‑for‑like to maintain correct boiling point and system behaviour.

How often should the radiator cap be replaced?
There’s no strict kilometre limit, but testing at major coolant services (e.g., when coolant is renewed) is wise. In hot climates or high‑kilometre use, many techs proactively replace the cap every few years, or any time there are symptoms like overheating, hose collapse after cool‑down, or evidence of leakage at the neck.