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How much coolant does your car eat? really
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samson_420
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PostPosted: Tue Nov 22, 2011 12:31 pm    Post subject:  How much coolant does your car eat? really Reply with quote

This is been a continuing issue since we got the car with 60k. It eats about a half of gallon every 2-3 months.

Yes, I know where it is going since there are no external leaks.

Can it be head gaskets along with the intake mani gaskets?

I know I can do the intake mani gaskets but it is a rough job and the car runs perfect and real cool.

We are almost at a 100k right now. And I'm kinda worried about splitting it open.

Also, I been considering flushing out the DexCrap and using the etheline glycol.


Any thoughts on any of this?

I want to keep the motor running as long as possible specially since the next big thing to go will be the AT.

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PostPosted: Tue Nov 22, 2011 1:05 pm    Post subject:   Reply with quote

It's probably related to bad intake manifold gaskets (since the head gaskets rarely fail on these cars). I was losing about a pint of coolant every other week for 2 years before my LIM gasket totally s**t the bed. To be honest, the LIM repair isn't that bad if you have half a brain and some common sense. Mine would have taken under 6 hours if I didn't need to get a new UIM.

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samson_420
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PostPosted: Tue Nov 22, 2011 1:09 pm    Post subject:   Reply with quote

IffyG wrote:
UIM



UIM?


I know I can do it. . . I just don't really want to.LoL

I work on cars all day, but this is one procedure I haven't done yet.

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PostPosted: Tue Nov 22, 2011 1:10 pm    Post subject:   Reply with quote

Upper intake manifold. It's a crappy plastic piece on the 3800 and when I took the Intrigue apart to replace the gaskets I had found mine melted and broke down in a few places. You won't have to worry about it since you have a 3400.

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samson_420
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PostPosted: Tue Nov 22, 2011 1:16 pm    Post subject:   Reply with quote

Ahh, I see. Yeah, at least mine is aluminum.

Any specific brands of gaskets better then others?


I am thinking I will do it before next summer hits.


Alldata calls for 5+ hours. Really does not look fun:(


I swapped motors that looked easier then this. . . . . I would compare this to doing a head gasket on a 4 banger Honda.


Making gaskets out of plastic. . . Turds.



What about swapping to green from the Dexcool?

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PostPosted: Tue Nov 22, 2011 1:20 pm    Post subject:   Reply with quote

Current generation DexCool is made from Ethylene Glycol without the silicates that eat away at aluminum engine parts

There is nothing wrong with DexCool (either the original formula or the current one), the problem was poor gaskets allowing air in causing the DexCool to react

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PostPosted: Tue Nov 22, 2011 1:22 pm    Post subject:   Reply with quote

I used Felpro gaskets on the Intrigue and they seemed to be pretty robust, much better than the nylon garbage that was in there. I would have gone with GM gaskets, but I couldn't get them in time to do the repair so Felpro was a good alternative.

I don't know if it's worth swapping from Dexcool to green coolant, but if you do make sure to flush out every bit of Dexcool before you put in the green stuff or you will be sorry you wanted to switch. It'll gunk up really good if you mix them.

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samson_420
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PostPosted: Tue Nov 22, 2011 1:23 pm    Post subject:   Reply with quote

bbengineer wrote:
Current generation DexCool is made from Ethylene Glycol without the silicates that eat away at aluminum engine parts

There is nothing wrong with DexCool (either the original formula or the current one), the problem was poor gaskets allowing air in causing the DexCool to react

BBEngineer



Makes sense

Since I have used DexCool in all my other GM's & never had any issues at all.

The Impala is the first with the gasket degradation I have seen.


Oh yeah, I seen DexCool and regular green mixed a few times. Looks like yellowish yogurt.

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PostPosted: Tue Nov 22, 2011 7:12 pm    Post subject:  how much coolant . . . Reply with quote

As far as antifreeze goes, if you read the ingredients on the back of the gallon jug for Prestone, Dexcool, Super Tech (Walmart brand) they all have the same ingredients word for word. So I went for the cheaper stuff.
I just flushed my 3.8 multiple times to get 90% of the dexcool out. I also flushed the heater core seperately. Took a week to complete but so far results are good and my heater now kicks ass at all points of discharge. Hope it stays that way. Cool

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PostPosted: Tue Nov 22, 2011 7:41 pm    Post subject:   Reply with quote

If your using that much coolant your oil should look like a milkshake.
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PostPosted: Tue Nov 22, 2011 8:47 pm    Post subject:   Reply with quote

98ss wrote:
If your using that much coolant your oil should look like a milkshake.



Nope, it's going into the combustion chambers. No other place for it to go.

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PostPosted: Tue Nov 22, 2011 10:06 pm    Post subject:   Reply with quote

bbengineer wrote:

There is nothing wrong with DexCool (either the original formula or the current one), the problem was poor gaskets allowing air in causing the DexCool to react


I agree; in fact the earlier 3100 engines which used regular green antifreeze had the same gasket issues that the 3400s do, the only difference is the green stuff was more forgiving of air in the system.
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PostPosted: Wed Nov 23, 2011 1:08 am    Post subject:   Reply with quote

Fricking crapiness. . . . . .


Yeah, the GM v6's are not my favorite engines. But, with "proper" care some make it to pretty high mileage(200k+).

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PostPosted: Sun Nov 27, 2011 8:21 pm    Post subject:   Reply with quote

Eat? Not sure. I recently had to swap out the OEM rad cap though, since it was bleeding off and not holding pressure completely, and at that time I noticed I was fairly low on coolant & added quite a bit. Not sure why or if it's a big deal or not yet. I hope it's not a LIM gasket issue Sad

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PostPosted: Mon Nov 28, 2011 1:21 am    Post subject:   Reply with quote

REDLINE wrote:
Eat? Not sure. I recently had to swap out the OEM rad cap though, since it was bleeding off and not holding pressure completely, and at that time I noticed I was fairly low on coolant & added quite a bit. Not sure why or if it's a big deal or not yet. I hope it's not a LIM gasket issue Sad



I do the same s**t.


It has to be it, nowhere else for the crap to go.

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