Combustion Leak Test (Head Gasket & Cooling System Diagnosis)

What it is

What is a combustion leak test (head gasket & cooling system diagnosis)?

A combustion leak test is one of the most reliable ways to confirm internal engine sealing faults without dismantling components. This procedure identifies whether combustion gases are entering the cooling system — an early indicator of head gasket failure, cracked blocks, or cylinder head issues.

Using a specialised colour-change fluid, the test provides fast and precise results, helping determine the true condition of the engine before committing to major repairs. A diagnostic chamber is placed on the radiator or expansion tank, and as the engine runs, vapours from the cooling system pass through a reactive fluid. If combustion gases are present, the fluid changes colour — providing a clear, immediate indication of internal leakage.

This method is non-invasive, quick, and suitable for most water-cooled petrol, diesel and LPG engines, and it can be performed at your home or workplace anywhere in Brisbane.

Why it matters

Why this service is required

• Confirms internal engine faults before teardown — no more guessing between a head gasket, a cracked block or a leaking cylinder head.
• Saves time and money by avoiding unnecessary disassembly of a healthy engine.
• Provides reliable, objective evidence for repair decisions before you commit to major work.
• Helps prevent overheating, coolant loss and further engine damage caused by a leaking head gasket.

Warning signs

When to book this service

Benefits

Benefits of our service

• Fast, precise results without dismantling any components
• Clear, immediate colour-change indication of internal leakage
• Early detection of head gasket failure before it wrecks the engine
• Confidence to commit to — or walk away from — a major repair
• Performed on-site at your home, office or roadside