Parts for your 2013 Toyota Fortuner-Radiator cap

2013 Toyota Fortuner radiator cap — is it used on this model?

Yes, the 2013 Toyota Fortuner uses a radiator pressure cap. This is confirmed by Toyota’s service literature for the AN60-series Fortuner/Hilux platform (Cooling System — Radiator Cap — Inspection in the Toyota Repair Manual), the 2013 Owner’s Manual safety cautions about not removing the radiator cap when hot, and Toyota Genuine Parts catalogues listing “Cap Sub-Assy, Radiator” (commonly 16401-31650 or 16401-20353, market-dependent) for 2011–2015 Fortuner models. Typical specified cap pressures for these engines (1KD-FTV, 2KD-FTV, 2TR-FE) are 0.9–1.1 bar, as stamped on the OE cap.

The radiator cap on a 2013 Toyota Fortuner does more than plug a hole. It’s a pressure regulator that raises the coolant’s boiling point, keeps pressure steady, and manages expansion and recovery to and from the overflow bottle. Under load—towing the boat, slogging up an alpine pass, or nudging along corrugations out bush—the correct cap pressure helps prevent boil-over and keeps coolant circulating properly through the radiator and heater core.

For servicing, it’s smart practice to inspect the cap at least every 12 months or 20,000 km, and replace it every 2–4 years or whenever testing shows it won’t hold the specified pressure. Toyota’s workshop procedure calls for pressure testing the cap and checking the rubber seals and vacuum valve. If the cap can’t hold its rated pressure (often 0.9 or 1.1 bar for Fortuner, printed on the top), it’s due for replacement.

• Common signs the cap is tired: slow coolant loss, a collapsed upper hose after cool-down, gurgling in the heater, staining around the neck, or overheating at highway speeds but not at idle.
• Quick checks: look for cracked or hardened seals, a sticky spring, or debris on the sealing faces. Make sure the radiator neck is clean and undamaged.

When fitting a new cap, the engine should be stone cold. Match the pressure rating to the build plate/owner’s manual or the stamping on the original cap. For best reliability with diesel Fortuners in Aussie and Kiwi conditions, stick with a quality OEM-equivalent cap. After any cooling-system work, top up with Toyota Super Long Life Coolant (pre-mix), bleed air as per the repair manual, and verify hot and cold levels in the overflow bottle.

Touring types often carry a spare cap in the kit—cheap insurance when the nearest servo is 300 km away. A healthy radiator cap is a small part that makes a big difference to cooling performance and engine longevity.

Popular questions about the 2013 Toyota Fortuner radiator cap

What pressure rating should the 2013 Fortuner radiator cap be?

Most 2013 Fortuner variants use a 0.9–1.1 bar cap (often 108 kPa). The exact rating is stamped on the original cap and noted in Toyota service data for the engine code. Matching that rating maintains the designed boiling point and hose protection.

If in doubt, read the cap’s top face, check the under‑bonnet label, or consult Toyota parts catalogues by VIN to confirm the correct pressure spec for the vehicle’s market and engine.

How often should the radiator cap be replaced on a 2013 Fortuner?

Inspect annually or every 20,000 km and replace every 2–4 years, or immediately if it fails a pressure test or shows seal damage. High-heat or heavy-towing use may justify shorter intervals.

Routine cap replacement alongside coolant service helps prevent gradual pressure loss, random overheating, and premature hose or radiator issues.

Can a faulty radiator cap cause overheating or coolant loss?

Yes. A weak cap lowers system pressure, which drops the coolant’s boiling point and can trigger overheating at highway speeds. It can also allow coolant to vent too soon and not recover back from the overflow bottle after cool-down.

Typical clues include frequent top-ups, crusty residue at the neck, and a flattened upper hose after an overnight park—classic signs the vacuum valve or main seal isn’t doing its job.