Question about 1998 GMC Sierra

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Intake manifold gasket leaking antifreeze on a 5.0L vortec

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  • 15 Answers

Head gasket needs replacing

Posted on Feb 06, 2010

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Posted on Jan 02, 2017

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SOURCE: 1995 Buick Park AV intake manifold gasket starting to leak

THIS IS VERY COMMEN IN FACT JUST ABOUT EVERY SINGLE 3.1AND 3.4 AND 3.8 EVER MADE BY CHEVY LEAKS AT THE LOWER INTAKE ALL OF THEM AND USEALLY STARTS AT ABOUT 50000 MILES THE PARTS COST ABOUT 300.00 AT THE DEALER FOR NEW GASKETS AND COOLENT AND SEALENT ALL THE PARTS YOU WILL NEED THE PROBLEM IS ITS ABOUT A SIX HOUR JOB SO THE LABOR KILLS YA BUT IT IS ALOT OF WORK BUT THE GOOD PART IS THERE IS NO NEED TO REMOVE THE PUSH RODS ON A 3.8 LIKE YOU DO ON A 3.4 I CAN GIVE YOU THE STEPS IF YOU LIKE BUT THIS JOB IS BEST TO SEND TO A MECHANIC AS IT HAS A LOT OF LITTLE THINGS THAT MUST BE DONE OR YOU CAN MAKE A BIGGER MESS THEN YOU GOT ALREADY... HOPE THIS WAS HELP FULL LET ME NO IF YOU NEED MORE INFO

Posted on Mar 27, 2009

  • 12104 Answers

SOURCE: My 1999 chevy tahoe is leaking antifreeze. I

it could but- check passenger side front where heater core line go into manifold right behind alternator the hose line is connected by a press clip into an alloy fitting this fitting gets eaten away by anti freeze and hose angle pulls back on fitting the part is $18 at dealer and is screwed into manifold use caution if ur r going to replace at very edge of aluminum manifold---and check ur water pump bolts the 2 longer ones should have a lock sealant on them they bolt in thru a water jacket

Posted on Oct 24, 2009

  • 8 Answers

SOURCE: just replaced intake manifold gaskets

You might have a cracked radiator, you should try to visually inspect it yourself, but it should be taken in to the shop to have a professional take a look at it.

Posted on May 04, 2011

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I have a 1997 gmc sierra 5.7 vortec, just changed plugs and wires, now it hiccups at idle, And excessive white smoke and gas smellout the exhaust any ideas?


If you have white smoke out the tail pipe you have a problem with antifreeze entering the fuel system and burning with the fuel .
You see the white smoke isn't smoke its steam from the water in the antifreeze .
Witch leaves with 1 of 2 problems head gasket or intake manifold gasket .
Being that its a chevy engine I would say its the intake manifold they have had a problem with this disgin for over 30 years not enough bolts to much glue .
Over heat this engine once the glue melts and it starts leaking because of the pressure .
The bigger problem you have is if you run this engine the antifreeze will get behind the pistion rings any wreck the engine in under a month.
So do something quickly if you want to save it
Good luck

May 12, 2015 | 1997 GMC Sierra

1 Answer

94 4.3 vortec getting horrible gas mileage why???


Go to You Tube Video to find the problems
with that motor & the solution
A local repair shop can check bulletins in their
data base for the fix also
Most likely intake gasket,if you use Dex Cool
It eats gaskets & the vehicle is old ,so you can expect
to be constantly working on it

Jul 01, 2013 | Chevrolet Tahoe Cars & Trucks

1 Answer

White smoke in exhaust 1999 lincoln after replacing intake manifold


Sounds like antifreeze leaking in to me. Ports at rear of intake are trick and easy to get that gasket mis-aligned. Hate to say it but when you take the intake back off I imagine the culprit will be obvious. Only other thing is that the intake wsa fine and you actually had a blown head gasket.

Apr 17, 2013 | 1999 Lincoln Town Car

1 Answer

I HAVE ANTIFREEZE LEAKING OUT OF MY INTAKE MANIFOLD ON MY 1987 GMC JIMMY


I had this happen to me the first time I replaced my intake manifold gaskets. It was hard to install the intake and gasket moved just enough and I had a coolant leak. Removed manifold and installed new gaskets and problem was solved. Good Luck.

Jul 26, 2011 | 1987 GMC Jimmy

1 Answer

Manifold water leak on 2002 blazer how do you get to it


This happens a lot with chevy engines 305 s 4.3 s its means the intake manifold gasket is leaking because the engine over heated at some point . Cheak your dip stick if you see a white fomey residue on the stick then look inside the radiator cap if you see oil floating on the top of the antifreeze it means oil and antifreeze are mixing this will kill the engine real fast so stop drivering it and have the intake manifold gasket replaced . ALso check for any other sorce of the antifreeze like a radiator hose or a gasket on the goose neck hopfuly you will find something else that easyer to fix but its a disgin problem with chevy they don't have enough bolts holding the manifold down theres 8 and there in the corners 2 in each well good luck with it

Jul 14, 2011 | Chevrolet Chevy Cars & Trucks

1 Answer

My gf has a 2001 blazer with the 4.3 vortec. it is leaking antifreeze and i cannot find the leak, its not getting in the oil,and the floorboards are not wet. someone told me that it could be the intake...


Most likely the intake gasket is leaking.You can check under the ac compressor and back by the transmission bell housing these are where the intakes usually leak. If you have a uv light it will illuminate the antifreeze very brightly.

Dec 04, 2010 | 2001 Chevrolet Blazer

1 Answer

1998 gmc 4x4 runs poorly and sounds like a vacume,air leak .


The 5.0l and 5.7l all have this problem at some time.The lower intake gaskets are bad.and are sucking air which will cause the eng. to idle high and sound like like there is a cylinder or two that are not firing and you also may loose antifreeze.The upper intake is black/plastic and the lower is aluminum.Tightening the lower intake bolts may seem to help but once the gaskets are blown,they need to be replaced.If its sucking more air through the bad gasket than the TBI it will not get the right air to gas mixture.Check that all vacuum hoses are in good shape and the vacuum line that runs from the top of the upper intake to the brake booster is sealed good in the intake.Hope this gives you a better idea.

Mar 03, 2009 | 1998 Chevrolet Tahoe

1 Answer

98 tahoe antifreeze leak


IT IS MOST LIKELY THE INTAKE GASKET LEAKING THIS IS A COMMON PLACE ON OLDER MODELS.

Jan 22, 2009 | 1998 Chevrolet Tahoe

2 Answers

2000 chevy impala ls - oil spray under hood inline with serpentine belt


You may have a lower intake manifold gasket leak (or a head gasket leak-slightly less probable) the lower intake can leak onto the serpentine belt and fling oil (and/or antifreeze). The lower intake manifold gasket is usually the culprit here. There is much information about changing it if you are inclined to do it yourself. If not, expect around 800 to 1200 to fix at dealer/mechanic. This is usually accompanied by (but not always) oil in the antifreeze, or antifreeze in the oil...

Jan 18, 2009 | 2000 Chevrolet Impala

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