Engine Compression & Cooling System Tools

How does a Combustion Gas Leak Tester (Block Tester) detect a blown cylinder head gasket?

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 Correct IncorrectDrawing radiator headspace vapors through blue bromothymol chemical indicator fluid: if combustion exhaust gases (CO2) are present, the fluid reacts chemically and turns yellow/green.

How does a Combustion Gas Leak Tester (Block Tester) detect a blown cylinder head gasket?

• By tasting the coolant with a test strip
• By checking if the radiator cap is warm
• By listening for rattling noises with a stethoscope
• Chemical bromothymol test fluid changes color from blue to yellow in the presence of combustion exhaust CO2