View Full Version : leaking intake manifold gasket

South Florida Lawns
12-31-2009, 02:57 PM
I have an 03 silverado 4.3 v6, that has what I believe is a leaking intake manifold gasket. The truck leaks about a dime size puddle of coolant on the ground in the winter. The belt squeels too this time of year and you can constantly smell coolant. For some reason its not noticible during the summer.

My question is how tough is changing the gaskests out? I really don't want to take the truck in and pay the money if its all just labor intensive.

I guess I need to start doing my reasearch. Any tips would be appreciated.

12-31-2009, 03:04 PM
Its super easy. Only thing thats a pia is the power steering pulley you need to rent the puller from auto zone or advance. Is it the front or the rear of the engine leaking? Just looked it up you don't need to take the pulley off its different then the blazers.

South Florida Lawns
12-31-2009, 04:32 PM
I see fluid on the front of the manifold and followed it down the front of the engine. So I believe its the front thats leaking but not totally sure.

I looked at some diagrams on how to do it and everything looks straight forward.

12-31-2009, 08:48 PM
Only thing is the intake gasket is plastic if I remember right and its reusable so I don't think that is the problem.

lawnboy dan
01-01-2010, 10:14 AM
this is a common gm problem on v6 engines but usually the buick based 3.8

South Florida Lawns
01-01-2010, 01:50 PM
I had it done under warrenty back around 2004 but can't remember what was all done.

I remember they said they added 4 quarts of oil thats all. I'll try and find the work form on what they all did.

01-01-2010, 05:07 PM
It's not that hard of a job, mostly time consuming but there's less in the way
of highly technical stuff to mess up... That's not to say you won't need a torque
wrench but it's still way easier than say, the cylinder head gasket.

01-02-2010, 12:23 AM
Try re-torquing it first.

Drew Gemma
01-02-2010, 04:17 AM
I was told that using silicon based anti freeze is the problem because the gasket is silicone based and the coolant eats the gasket. we run the old school green stuff in our chepy

South Florida Lawns
01-04-2010, 01:45 AM
Hmmm you guys both have good points, I will look into both options. I think I may sell this truck soon as I have grown out of it.