Compression Ignition Addict
Join Date: Dec 2008
Location: port arthur texas
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The best test for combustion gas is either the test strips or the tester with the colored chemicals. If it is heads or egr cooler it will have to have combustion gas in the coolant.
No combustion gas no head gasket or egr cooler failure period.
Your pressure issue is then one of the other possible causes, coolant overheat causeing extra exspansion of the coolant along with possibily overfull of coolant to begin with.
Pump cavitation can also add some pressure. A bad cap that doesn't vent at 16 psi is also possible.
Lord I shall lead them to the water but I will not try to make them drink