Lisle detectors are easy to use--simply connect the hose to any vehicle vacuum line or use the included red adapter with your hand vacuum pump, place the tapered end into the radiator opening, and start your engine. The vehicle vacuum or the vacuum pump draws vapors through the indicating fluid and changes yellow when exposed to combustion gases from the radiator. Bad head gaskets, cracked blocks, and cracked or warped heads can cause combustion leaks--check them out with Lisle combustion leak detectors.
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