Parts for your 2007 Toyota Highlander-Head gasket

2007 Toyota Highlander (Kluger) Head Gasket — what it does and when to sort it

The 2007 Toyota Highlander (sold as Kluger in Australia and New Zealand) absolutely uses a head gasket. Toyota’s Factory Service Manual (FSM) for the 2AZ-FE 2.4‑litre four and 3MZ‑FE 3.3‑litre V6 includes full cylinder‑head removal and installation procedures with head‑gasket specs and torque‑angle settings, and Toyota’s Electronic Parts Catalogue lists head gaskets for both engines. So yes—this part is relevant on this model.

On these engines, the multi‑layer steel head gasket seals the cylinder head to the block, holding combustion pressure while keeping engine oil and coolant in their own passages. When it’s healthy, the vehicle runs smoothly, holds good compression, and keeps its cool under Aussie and Kiwi conditions.

Common signs it’s on the way out include:

• Overheating or unexplained coolant loss
• White steam from the exhaust, sweet smell
• Milky, coffee‑coloured engine oil or frothy coolant
• Cold‑start misfire, pressurised hoses, or bubbles in the radiator

If replacement’s on the cards, it’s a proper workshop job. The FSM calls for precise surface flatness checks, correct head‑bolt torque‑and‑angle, and clean, dry mating faces. It’s smart to send the head for a light skim and pressure test, fit a quality MLS gasket, and use new torque‑to‑yield head bolts. On 2AZ‑FE engines, technicians are mindful of known head‑bolt thread issues in the block, approved thread‑insert repairs are the right fix if needed. Timing components come off (chain on 2AZ‑FE, belt on 3MZ‑FE), so assess the water pump, thermostat, and timing parts while you’re in there.

Coolant choice matters—use Toyota Super Long Life Coolant, bleed the system thoroughly, and replace the radiator cap and any tired hoses. Post‑repair, change the oil and filter and recheck levels after the first few drives.

As far as prevention goes, keep the cooling system in top nick. Stick to coolant service intervals appropriate for Toyota SLLC, keep the radiator clean, and don’t ignore small leaks or a lazy thermostat. With good maintenance and proper temperature control, many Highlander/Kluger head gaskets run happily well past 200,000 kilometres.

• Does the 2007 Highlander/Kluger have a head gasket?
  Yes. Both the 2AZ‑FE and 3MZ‑FE engines fitted to the 2007 model use a multi‑layer steel head gasket. This is documented in Toyota’s Factory Service Manual cylinder‑head procedures and shown in Toyota’s parts listings for the model.
• How long should a head gasket last on a 2007 Highlander?
  There’s no set expiry. With the cooling system maintained and the engine not overheated, head gaskets often last the life of the vehicle—200,000 km and beyond. Overheating, low coolant, or poor assembly are the usual reasons they fail early.
• Is it safe to drive with a suspected blown head gasket?
  Not recommended. Driving risks overheating, warped heads, catalytic converter damage, or even hydrolock. If symptoms appear, park it and arrange diagnosis—coolant and compression tests align with Toyota FSM guidance.