Quickly Pinpoints Combustion Leaks. Detects bad head gaskets, cracked blocks, & 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. Place tapered end oQuickly Pinpoints Combustion Leaks. Detects bad head gaskets, cracked blocks, & 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. Place tapered end o





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