Hi, I have a ’95 Blazer with a 4.3L Vortec V6. The engine has
developed an internal coolant leak. No external leaks are visible. A
considerable amount of white smoke comes out of the exhaust. The
coolant level drops and there appears to be coolant dripping out where
the right exhaust manifold mates to the Y-pipe. I pulled the right
side plugs. The #6 plug appeared to have a little more buildup on it
but all appeared dry. I cranked the engine over, but nothing came out
of the plugholes. The question I have is, could this leak be from the
lower intake manifold gasket or a head gasket problem or worse? Thanks!
Does the heater blow hot air?
Does the coolant look dirty or oily?
How much smoke is "considerable"?
If the heater is blowing hot air, the coolant is clean, and the smoke is
not too bad,
it would indicate to me the intake gasket is leaking badly.
If the heater is blowing cold or slightly warm air, the coolant is
dirty/oily, and the
engine smokes badly, it would indicate a blown head gasket or even a burned
I would do a compression/leakdown test.
Even compression across all cylinders would point toward an intake gasket.
Uneven compression across the cylinders would indicate a blown head gasket
Please let us know what you find, I'm curious.