Quote:
Originally Posted by nova72
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!
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Any external leaks on top/rear/front of intake?
Has intake gasket ever been replaced?
Does engine heat up fast or overheat on a pull?
To make sure it is not a head gasket they make a chemical block test for exhaust gas from headgasket leaking into rad coooling system.
If you plull lower intake gasket you should be able to see if it is cracked out or leaking in that area.
If you replace it use only the felpro problem solver hard rubber/steel intake gasket.