Before you buy ANY Cadillac with the VIN Y or 9 Northstar V8, this is a NECESSARY, and cheap test that doesn’t require any modifications to the car to perfor…
Before you buy ANY Cadillac with the VIN Y or 9 Northstar V8, this is a NECESSARY, and cheap test that doesn’t require any modifications to the car to perfor…
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This test can be done as soon as you start the engine (or shortly there
after). The coolant flow is ALWAYS flowing through the cylinder coolant
ports on a northstar and always flowing through the coolant fill tank. The
thermostat has nothing to do with coolant flow through the engine.
This test can be a false indicator of a blown head gasket. On a northstar,
coolant can be exposed to exhaust gases by a failing coolant cross over
manifold gasket (which is also a very common leak associated with the
northstar). When the EGR valve opens, exhaust gas flows through exhaust
ports in the coolant manifold crossover to cool exhaust gases before the
gas goes into the intake. A failing gasket here will introduce exhaust
gases into the coolant – thus causing this test to be positive for exhaust
gas — but not necessarily a blown head gasket positive test.
The ONLY way to prove that a northstar has a blown headgasket is to do a
proper cylinder leak down test on a warm engine – which should take 2 or 3
days…
All that being said – this is a great video and a good place to start on a
northstar exhaust in coolant issue, and “phantom coolant loss” issue.
you should start a channel dedicated to automotive repair.
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