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Old 24 May 2015, 10:54 am
ptcruisersteve ptcruisersteve is offline
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Join Date: Aug 2014
Location: Thousand Oaks, CA
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Default Re: Head Gasket Testing

On one of the Block Tester instructions I saw it states that if the test fluid from blue to blue green its okay. If the test fluid changes from blue to yellow you have a combustion leak. The yellow is in bold letters and capitalized. It also says to check the radiator and coolant leaks if the results are negative.

On some posts on this forum I have read that any color change indicates combustion gases in the coolant system so I feel there are some confusion on the test fluid change from blue to blue green. In the beginning stages with only a slight leak of exhaust gasses the concentration of hydrocarbons is low so you would expect only a slight color change.


The question I have is if you get a positive reading on the block test from blue to yellow but you replace the radiator and it doesn't overheat anymore are we just compensating for one of the stages of a blown head gasket?

Last edited by ptcruisersteve; 24 May 2015 at 10:57 am.
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