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#2397376 - 10/05/11 04:50 PM Coolant suggestions for 1994 Chevy Astro 4.3L
sr17 Offline


Registered: 12/07/09
Posts: 234
Loc: Vancouver, BC
My van has developed a leak on the intake manifold gasket, and new coolant is part of the repair.

What does the BITOG community suggest for this vehicle?
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2005 VW Jetta TDI - 202,000 km
2000 VW Golf TDI - 306,000 km
both on Mobil 1 TDT 5W40

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#2397431 - 10/05/11 05:35 PM Re: Coolant suggestions for 1994 Chevy Astro 4.3L [Re: sr17]
Bill in Utah Offline



Registered: 11/11/02
Posts: 12792
Loc: UT
I'm running Peak Global lifetime in my 04 4.3l GMC. Every 3 years just going to do a drain and fill with 60/40 mix.

MY 1996 4.3 Chevy has 270k with Dexcool changed every 3 years. Its really not that picky on fluid as long as you FLUSH out any old coolant IF you change over.

Take care, Bill

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#2397460 - 10/05/11 06:15 PM Re: Coolant suggestions for 1994 Chevy Astro 4.3L [Re: sr17]
Donald Offline


Registered: 03/21/04
Posts: 14309
Loc: Upstate NY
My 1993 5.7L Suburban runs G-05. Its not much more $$ than other antifreeze and now I can run G-05 in all my vehicles.
_________________________
2001 Jeep Grand Cherokee Laredo 4.0 - PP & M1
1999 Dodge Ram 2500 w/Cummins - Rotella T6 & M1
Amsoil ATF in both vehicles & Magnefine filter.

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#2397488 - 10/05/11 06:51 PM Re: Coolant suggestions for 1994 Chevy Astro 4.3L [Re: sr17]
sr17 Offline


Registered: 12/07/09
Posts: 234
Loc: Vancouver, BC
Was there not something about this intake manifold gasket issue being caused by using the wrong kind of coolant, or am I off base here?
_________________________
2005 VW Jetta TDI - 202,000 km
2000 VW Golf TDI - 306,000 km
both on Mobil 1 TDT 5W40

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#2398739 - 10/06/11 09:48 PM Re: Coolant suggestions for 1994 Chevy Astro 4.3L [Re: sr17]
Donald Offline


Registered: 03/21/04
Posts: 14309
Loc: Upstate NY
Originally Posted By: sr17
Was there not something about this intake manifold gasket issue being caused by using the wrong kind of coolant, or am I off base here?


I think you are referring to the intake gaskets that had some plastic in them and the plastic was damaged by 2-EHA which is in Dexcool and Dexcool clones like "all makes all models". Once air got into the cooling system from the damaged gasket, sludge formed (Dex-sludge).
_________________________
2001 Jeep Grand Cherokee Laredo 4.0 - PP & M1
1999 Dodge Ram 2500 w/Cummins - Rotella T6 & M1
Amsoil ATF in both vehicles & Magnefine filter.

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#2399051 - 10/07/11 10:36 AM Re: Coolant suggestions for 1994 Chevy Astro 4.3L [Re: Donald]
Boss302fan Offline


Registered: 11/07/09
Posts: 2073
Loc: Oconomowoc Wi
Originally Posted By: Donald
Originally Posted By: sr17
Was there not something about this intake manifold gasket issue being caused by using the wrong kind of coolant, or am I off base here?


I think you are referring to the intake gaskets that had some plastic in them and the plastic was damaged by 2-EHA which is in Dexcool and Dexcool clones like "all makes all models". Once air got into the cooling system from the damaged gasket, sludge formed (Dex-sludge).


Most issues happen when owners do not follow a regular maintenance schedule and also some faulty radiator caps. Filling the overflow tank a few inches above the hot mark(while cool) also helps prevent any air getting in the system. I would do this with any coolant.

As with all coolants, I would recommmend radiator drain and fills every other year to prevent most coolant issues. Changing out the rad cap every 3-4 years also may help.
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2006 Lexus LS 430
1990 Jaguar XJS V12
2011 Hyundai Santa Fe V6
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#2441915 - 11/22/11 03:00 PM Re: Coolant suggestions for 1994 Chevy Astro 4.3L [Re: sr17]
cp3 Offline


Registered: 07/26/06
Posts: 2642
Loc: Kitchener, Ontario, Canada
Originally Posted By: sr17
My van has developed a leak on the intake manifold gasket, and new coolant is part of the repair.

What does the BITOG community suggest for this vehicle?


Oh, I feel for you brother! Not a terribly fun job, at least not in the driveway in December, at minus whaterver, it wasn't. Realy it's just akward because of the location. Easier to get the manifold in and out with two people, one inside one out.

As for the coolant, I would agree with Bill. Whatever, just rinse it if you're changing.
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Pontiac G6 GT|Mobil 1 0w40|Mobil 1 M1-101

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