: Combustion Leak Detection



krimson_cardnal
06-11-08, 02:27 PM
Some information on Combustion Leak Detection.

I learned from Lisle - maker of the most commonly available test kit - that all one is doing is checking for the presence of CO2 in the cooling system. The test has nothing to do with the coolant. With HG failures leaking combustion into the cooling system you can test any where on system, the two easiest places are at the radiator or the expansion tank, both being closed to the cooling system. The test draws air, not coolant through the test solution. If coolant is drawn through the solution it is ruined, test needs to be done again with fresh fluid.

If a test proves positive for the presence of CO2 the fluid changes color. Then, by drawing room air through the same fluid it will turn back to blue, and is still good for a new test.

So the frequency of coolant replacement is not a factor in test results, having the engine running is.


YOU ARE TRYING TO PULL CO2 OUT OF THE SYSTEM WHICH HAS NOTHING TO DO WITH THE ANTIFREEZE. IF YOU HAVE A CRACKED HEAD OR BLOWN HEAD GASKET IT SHOULD PUT CO2 INTO THE COOLANT SYSTEM AS THE VEHICLE IS RUNNING. IF YOU PULL COOLANT INTO THE TEST FLUID THE FLUID IS RUINED BUT IF YOU DON'T PULL COOLANT INTO TEST FLUID IT'S STILL GOOD. JUST PULL ROOM AIR THROUGH THE TEST
FLUID AND IT WILL TURN BACK BLUE AGAIN. QUESTIONS JUST CALL 712-542-1950


Mike Whitehead

Design Engineer

Lisle Corporation

807 E Main St

Clarinda, IA 51632
Hope this helps in understanding. K_C

zonie77
06-12-08, 09:11 PM
You get a gold star for that!:yup: