3.4L V-6 intake manifold gasket

That engine is a 60 degree engine. The way the intake mates to heads and block is prone to leaks. Not much you can do about it. Flush the antifreeze regularly. Add the GM leak stop pellets. Watch fluid levels frequently, especially at 30k+ miles. NEVER let it overheat.

I think it's safe to say that is a good idea for any car.

I don't think the redesigned gasket came out until late 2002. The problem usually starts at around 40k miles. Do a google search on GM 3400 and read some of the forums and web pages on the subject. The problem is wide spread and from what I can see GM won't help.

Do not try to prevent leaks on warranty !!! You Want it to leak during the warranty !!

The new design gasket set was not used until November 2002. You have the old design and need to watch your anti freeze level and bring it right in the minute you see it drop......preferably will still under warranty! Now it's getting easier to see why the 2003 vehicles are being sold off so cheaply isn't it?

We have a '99 Chevy Venture minivan with 62K miles and the 3400 engine. The intake gasket hasn't failed yet. Hopefully, that means we have one that's going to be alright. It's a $600 fix to have it changed, so I'll just continue checking the antifreeze level every other day or so (I'm kinda of anal about vehicles and fluids).

Get an oil analysis for $20 to make sure that the leak hasn't started.

John