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#2487054 - 01/08/12 06:06 PM GM 3.4 Leaking Anti freeze, need temporary fix
Joe72Mart Offline


Registered: 06/19/11
Posts: 151
Loc: NE Ohio
Hi Guys
thx for all the previous help I've received.

Today's problem: 3.4 in Chevy Venture leaking anti freeze, appears to be from rear bank. It's probably the typical intake gasket problem. What stop leak do you guys recommend to slow this down until warmer weather arrives? Used my Stant to pressurize system and leak is dripping down block near tranny pan. Impossible to see where it's coming from-V6 in a minivan is a tight fit. Can't get van into my garage to fix due to the "garage queen" Chevelle!
thx in advance for any suggestions/help
Joe
_________________________
1970 Chevelle SS396/375HP
2002 Cavalier
1991 S10 Iron Duke 5sp W/T
2003 Corolla CE 38k miles NUMMI built by GM/Toyota

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#2487069 - 01/08/12 06:16 PM Re: GM 3.4 Leaking Anti freeze, need temporary fix [Re: Joe72Mart]
beast3300 Offline


Registered: 12/24/09
Posts: 3003
Loc: Ohio
It could be head gasket too. The 3400 cooks under/in the small engine bay of those vans. You could try some sort of stopleak but I wouldn't recommend it.
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#2487071 - 01/08/12 06:18 PM Re: GM 3.4 Leaking Anti freeze, need temporary fix [Re: Joe72Mart]
Drew99GT Offline


Registered: 10/11/02
Posts: 20700
Loc: Colorado Springs
Can you drain the radiator? Whatever you use, drain the radiator, add the sealer, then refill the system. That way the sealer has a chance of making it into the engine block. I've used Bar's Leaks many times on GMs; if you add it when the radiator is full, it tends to sit in the fins in the radiator.

Although I've used the regular Bar's Leaks, I'd try the premium head gasket fix. It claims to fix head gasket and other leaks better then the regular Bar's Leaks.

The cooling system will end up somewhat gummed up with sealer after you use it, so subsequent drain and fills aren't a bad idea.

I've had good success using the basic Bar's Leaks on 2 GM vehicles.

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#2487078 - 01/08/12 06:22 PM Re: GM 3.4 Leaking Anti freeze, need temporary fix [Re: Joe72Mart]
Corvette Owner Offline


Registered: 01/22/03
Posts: 1601
Loc: Waldorf, Maryland
I've had good success using a powdered sealant, think it's called Alumni Seal or something close to that. Most stores sell it, small tube.
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#2487082 - 01/08/12 06:25 PM Re: GM 3.4 Leaking Anti freeze, need temporary fix [Re: Joe72Mart]
Ojustracing Offline


Registered: 12/08/02
Posts: 90
Loc: Albany, NY
As beast says it could be a headgasket. The stop leak I prefer are ones that are dry powered. The one exception to this is from the company that makes restore engine treatment. Its called radiator restore. I have used that with good results. The ones with Liquid contain something that attacks/swell hoses after continued use.

Almost every time I take one of these apart the gasket is also leaking into the oil. Just not in large enough quantities to be seen with the naked eye.

John
_________________________
26+ years fixing things. ASE Master Automobile Technician, L-1 Advanced Level Specialist, C-1 Service Consultant

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#2487084 - 01/08/12 06:27 PM Re: GM 3.4 Leaking Anti freeze, need temporary fix [Re: Joe72Mart]
Clevy Offline


Registered: 11/11/10
Posts: 7240
Loc: Saskatoon canada
Stop leak may clog more than just your leak. And do you know if it's leaking in to a cylinder. The water jackets can be very narrow and you may end up with bigger problems than just this leak.
If you are going to put in stop leak please drive around for at least an hour after you put it in. It will get the coolant to cycle thru many times and eliminate or lessen the chances of a blockage somewhere in the system
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#2487086 - 01/08/12 06:28 PM Re: GM 3.4 Leaking Anti freeze, need temporary fix [Re: Drew99GT]
Joe72Mart Offline


Registered: 06/19/11
Posts: 151
Loc: NE Ohio
thx for the replies Drew and Beast,

This thing is a bear to work on. Can't even change rear plugs w/o removing dogbones. Looks like a multiple day job changing intake and head gaskets. Weather here in NE Ohio makes it tough to plan any major outside jobs. Ever use the GM tablet sealers that are made by Bar's Leaks? Just looking to slow this down until spring. Will then pull apart to do correctly.
_________________________
1970 Chevelle SS396/375HP
2002 Cavalier
1991 S10 Iron Duke 5sp W/T
2003 Corolla CE 38k miles NUMMI built by GM/Toyota

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#2487096 - 01/08/12 06:37 PM Re: GM 3.4 Leaking Anti freeze, need temporary fix [Re: Clevy]
Drew99GT Offline


Registered: 10/11/02
Posts: 20700
Loc: Colorado Springs
Originally Posted By: Clevy

If you are going to put in stop leak please drive around for at least an hour after you put it in. It will get the coolant to cycle thru many times and eliminate or lessen the chances of a blockage somewhere in the system


+100 This is very important. Do it with the heat on high so the product doesn't clump up towards the heater core valve.


Edited by Drew99GT (01/08/12 06:39 PM)

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#2487099 - 01/08/12 06:39 PM Re: GM 3.4 Leaking Anti freeze, need temporary fix [Re: Joe72Mart]
Drew99GT Offline


Registered: 10/11/02
Posts: 20700
Loc: Colorado Springs
Originally Posted By: Joe72Mart
thx for the replies Drew and Beast,

This thing is a bear to work on. Can't even change rear plugs w/o removing dogbones. Looks like a multiple day job changing intake and head gaskets. Weather here in NE Ohio makes it tough to plan any major outside jobs. Ever use the GM tablet sealers that are made by Bar's Leaks? Just looking to slow this down until spring. Will then pull apart to do correctly.


I've used the Bar's powder, which many say is the same thing as the tablets, just ground up. Fixed a leaky heater core in my Dad's Blazer and it never needed replacing after many years.

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#2487102 - 01/08/12 06:42 PM Re: GM 3.4 Leaking Anti freeze, need temporary fix [Re: Joe72Mart]
HerrStig Offline


Registered: 08/24/11
Posts: 2929
Loc: Boston, MA
Where's GMBoy when you really need him?

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#2487123 - 01/08/12 06:55 PM Re: GM 3.4 Leaking Anti freeze, need temporary fix [Re: Joe72Mart]
Dakota1820 Offline
formerly chevyboy14


Registered: 04/28/11
Posts: 3894
Loc: missouri usa
Try k&w head gasket stop leak. It worked for me on an old cavalier almost instantly. And when I did tear it apart almost a year later you would have never known it was there. I highly recommend that its priced well to
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#2487132 - 01/08/12 07:01 PM Re: GM 3.4 Leaking Anti freeze, need temporary fix [Re: HerrStig]
Joe72Mart Offline


Registered: 06/19/11
Posts: 151
Loc: NE Ohio
thx again for all the replies

Friend worked at at GM plant and claims they dropped a couple of tablets into each car on the assembly line. I looked at Bar's Leaks MSDS and a couple of the active ingredients are ginger and walnut shells??
Can't be sure if head gasket is intact, can't get a compression gauge near plugs due to tight fit. Oil drained seems OK, never had analysis done. No white smoke out of tailpipe. No CELs. Van seems to run OK.
Joe
_________________________
1970 Chevelle SS396/375HP
2002 Cavalier
1991 S10 Iron Duke 5sp W/T
2003 Corolla CE 38k miles NUMMI built by GM/Toyota

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#2487162 - 01/08/12 07:24 PM Re: GM 3.4 Leaking Anti freeze, need temporary fix [Re: Joe72Mart]
PhillyJoe Offline


Registered: 03/19/09
Posts: 521
Loc: PA
The GM tablets may work for an intake gasket leak. Don't know about a head gasket. GM does recommend the tablets (made by Bars).
I've used the Bar's Leak in my daughter's 2002 Grand Am with the 3.4. Holding so far after a year but it's a temp fix. Whatever you use, I smashed the pellets before putting them in.

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#2487171 - 01/08/12 07:31 PM Re: GM 3.4 Leaking Anti freeze, need temporary fix [Re: Joe72Mart]
JHZR2 Offline



Registered: 12/14/02
Posts: 33698
Loc: New Jersey
I'd get the Bar's powder that is actually crushed walnut (like the GM tabs).

In reality it is poor practice to bandaid something like this for months. Get it fixed. If the chevelle is that scared of getting wet, pay someone to do it and have a proper engine again. Dont take chances as it could propagate into worse things.

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#2487178 - 01/08/12 07:37 PM Re: GM 3.4 Leaking Anti freeze, need temporary fix [Re: Joe72Mart]
ArrestMeRedZ Offline


Registered: 11/11/08
Posts: 657
Loc: Las Vegas
I had a leaking intake manifold with this engine in an Alero. I had assumed it was the intake manifold gasket being incompatable with Dexcool, but after repairs, don't think that was the problem (yet). The intake manifold leaked from the mounting bolts loosening up, and from the thermostat bypass tube, which appears to just be pressed into the manifold.
The GM fix is to reinstall the tube with sealant (there's a GM part number for this, but I think it's just red Locktite) and install new intake manifold bolts that come pre-equipped with Locktite to keep them from loosening up.
For a quick fix (if you don't have the thermostat bypass tube problem) you might try just retorquing the manifold bolts. In the Alero, one or two required a 10mm crow's foot wrench to use with the torque wrench. In your van, I'm not sure of the accessibility.

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