Lisle Combustion Leak Detector

Checks for combustion leaks caused by bad head gaskets,
cracked blocks, and cracked or warped heads

Fluid changes from blue to yellow when exposed to
combustion gases from the radiator

Connect the hose to any vehicle vacuum line
(On tools made after June 2002, use the red adapter
with a hand vacuum pump)

Place tapered end of tool into radiator opening

With the engine running, the vehicle vacuum or the
vacuum pump draws vapors through
the indicating fluid for testing