The corners of the intake manifold have coolant pasages. The lower intake manifold gasket will need to be replaced. There is an updated manifold gasket, manifold bolts, and torque specification. Call the chevrolet dealership and see if they will extend the warrant on this repair. It is a very common problem with this engine. Thanks Steve
SOURCE: losing anti-freeze.no leaks.how to check intake
It's the head gaskets. There are some really good liquid solutions like K&W Block Sealer
SOURCE: ANTI-FREEZE LEAK AT INTAKE/PLENUM MANIFOLD.
Not alot you can do but remove the intake plenum and have the gasket replaced.
SOURCE: Anti-freeze leaking from either the freeze plug or
Without knowing what year or engine size is, I/m just guessing??????? But the 3.1L engines are FAMOUS for intake maniflod gaskets leaking. Look where the intake bolts to the heads. A freeze plug is in the block. Freeze plugs dont leak unless you have been running pure water or weak/cheap anti-freeze. They will rust out from behind and its BIG BUCKS to replace them all.
SOURCE: 99 Gran Am 3.4 litre engine, lower manifold leak.
Yes it is common, generally the best thing you can do is buy the most expensive gaskets you can find, use "right stuff" rtv gasket material wherever you can (do not use on seals that come into contact with fuel, and as with all rtvs apply a thin bead and do not spread or smooth with your finger or anything else, just apply and press the part on, if it smears when re-installing remove it, clean it thoroughly and start over). Also be sure to check the manifold for warping or cracking, and have a machine shop resurface all areas that are sealed with a gasket.
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Hi
You will need to replace the intake gasket.
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