Last post on Apr 04, 2003 at 7:23 PM
You are in the Maintenance & Repair - Archived Discussions
This discussion is ARCHIVED. To reactivate the discussion, post a request in the Lost? Ask the M&R Host for directions! discussion.
What is this discussion about?
Chevrolet Venture, Engine, Van
#10 of 19 it continues to bother me seriously that we have all these gasket fails
Mar 07, 2003 (9:29 pm)
when we presumably know more about sealing technology than we did in the 1950s. I have a sneaking suspicion that gasket and sealer improvements are being used to cover engineering to a certain mile marker, say 95 thousand just to start discussion, and the fails are because there is no margin for any production errors or seedy sealant.
it would be the old so-called GM 350 "diesel" all over again, in which two more head bolts on a gas engine supposedly made it possible to burn diesel in the chevy short block. didn't work. couldn't work. but they sure tried to stonewall through.
Mar 08, 2003 (2:43 am)
That was a modified Oldsmobile 350 block. Replaced more broken main bearing cap bolts on those lumps than I can count.
#12 of 19 3.4 antifreeze loss
Mar 14, 2003 (7:33 am)
My 98 Venture started losing coolant at 55000. I kept adding and adding. The shop I use tried to snug down the bolts to the intake manifold, to no avail. They did replace the gasket at 65,000. No more leaks yet (91,000) but alot of other problems. It is too bad because I love the van.
#13 of 19 Just be thankful...
Mar 14, 2003 (8:41 am)
...that GM used Oldsmobile blocks as the basis for their Diesel instead of the Chevy block! The Olds 350 was the strongest of them back then, so as badly as it took to Diesel mods, a Buick or Pontiac would've been worse, and a Chevy, truly devastating!
As for these coolant leaks nowadays, well don't the 3.1/3.4 and 3.8 use a plastic intake manifold? Seems to me that's just asking for trouble, since plastic does all sorts of fun things like warp, crack, get brittle, etc.
Swschrad, I do believe they actually have learned a lot about gaskets and sealing technology since the '50's. The technology has advanced greatly since then, but unfortunately sometimes it gets focused more on finding ways to make things cheaper, instead of better!
#14 of 19 Stop leak
Apr 03, 2003 (7:56 pm)
0patience, maybe you can give me some advice here. I have a 99 Nissan Quest with about 84,000 miles. I have a slight external coolant leak. It's not even really a leak, more like seepage. I can see green gunk near what appears to be the junction of the intake manifold and the front head, under the intake manifold. There are a number of coolant lines that run under the manifold, and possibly through it as well, and I can't see exactly where it is coming from.
I have to add a splash of coolant every 4-5 months. It's not causing any problems that I can see, other than some of the gunk is starting to get into one of the spark plug wells.
I'm thinking of adding some stop leak to the radiator, since it doesn't seem worth the effort or expense to fix it. Is there any downside to this? Can this harm the cooling system, or should I jsut live with it?
#15 of 19 Barsleaks...
Apr 03, 2003 (8:06 pm)
...according to the bottle it is added to the radiators at the factory by the major makers to prevent leaks. I have a hard time believing this. I,ve used both alumaseal and barsleaks and found the barsleak to be gentle and not block anything. I know people that put in the barsleak before they even have a leak.
Apr 03, 2003 (8:15 pm)
sure it has, and for a 200% improvement in pressure/temperature resistance, for instance, there is always an engineer who figures they can squeeze 300% out of it. those are the guys who leave us with head gasket and intake gasket issues. their names should be on the block, along with their home phone number, so we can congratulate them on making an engine that goes 20,000 before turning into a paperweight.
Apr 04, 2003 (11:11 am)
No. If that is all you are losing do not take a chance. I jsut did this in two cars and one of them needed a new radiator a month later, the other doing fine. An external leak hurts nothing, do not take the risk, just add coolant every few months. It may get worse or it may just stop on its own.
Not worth the risk of a sealer, only as a last resort to a major repair.
#18 of 19 the way then make 'em nowadays
Apr 04, 2003 (4:59 pm)
with hotter engines and skinny little coolant passages, I tend to agree, stop-leak is only for emergency repair purposes.
Apr 04, 2003 (7:23 pm)
DO NOT use sealers.
To my knowledge, Cadillac is the only manufacturer that recommends any sealer and ONLY their sealer.
Ok, here's the deal. You can easily, with little effort, locate the source of the leak.
Once the leak is located, it can then be fixed properly, as the leak will only get worse.
All you need to do is get a UV Leak Detector light, I have one from Tracerline, TP-8600 Blue Max™ Penlight and one from Lisle products, 36000 Flexible UV LED light. These lights are around $40. If you can't find them, e-mail me.
Then go down to your local part store and get a bottle of Coolant Leak Detection Dye and put it in the radiator.
Run the vehicle for a while and then use the IV light to find the location of the leak.
Here is an article on how to use the leak detection light and dye.