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To appear in July 2007 Cool Profit$ Magazine
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Back in early 2001 (within Cool Profit$ Magazine #41), I first detailed specific DEX-COOL® contamination problems as part of a review of a presentation at the MACS 2001 Convention. The presenters were from General Motors and Equilon. (The latter, GM’s supplier of DEX, after a stint as ChevronTexaco, is now Chevron Corporation.) Within the first two paragraphs of that piece, I praised the two companies for their candor. I believe I even described their session as refreshing.
In my third paragraph, I carried more corporate water by pointing out that only specific vehicle models had contamination problems. Doing so nicely highlighted their argument that DEX, therefore, could not be the contaminating culprit: If DEX was bad, ALL vehicles using it should have suffered uniformly. Okay, well now I’m taking
a lot of it back; please modify the title of the article in your magazine. Instead of
GM and Texaco “Bare All” about DEX-COOL®, change the
“Bare All” to “Bare Little.” It could also say
“Hide A Lot” or “Ignore The Obvious.”
Above: Rusty coolant leaks can be easily traced from the left coolant port of the IMG (Intake Manifold Gasket) into the center of the GM 3.1L/3.4L V-6 engine.
But that still leaves the logical question: if DEX isn’t the problem, why are all of those DEX charged vehicles coming to your shop
with fouled cooling systems? Are the owners doing something so wrong to
cause that amount of contamination? The clear answer in 2007 is: it’s probably not their fault.
Well, yes, that 's true. However, if GM had originally installed the
proper overflow tank in the correct location, and dittos for the pressure cap,
plus properly designed intake manifold gaskets, maybe so many GM cars and trucks wouldn’t have become contaminated. I’d continue on that line but I’m getting ahead of myself, more on the video later.
Next, as a description of the presenter's personal observations, I wrote that they advised to now start filling the overflow bottle
of affected GM S-10 Blazer series vehicles to the Hot level. I would hope that at the factory, important factors like that would be more thoroughly tested. While I didn’t respond to it then, I will now. Fill it to Hot because filling it to the Cold level doesn’t keep enough coolant in the system. How come? (Not an intelligent question, but effective.)
Bud Abbott: “Well, see, the iron oxide (rust) component, it came from the upper engine block
and heads. When the coolant level dropped too low, they became uncovered
"beachheads," then overheated and rusted.”
Note: We believe GM went through a radiator cap vendor changeover that coincided somewhat with the DEX changeover. It is possible that engineers could have tested the new cap for pressure and temperature opening and closing accuracy, life cycling, etc., without subjecting it to the severe contamination it would end up enduring. Of course, the first probably wasn't checked to that level of fouling either.
About the 5.7L
End of Part 1.
Click for DEX-COOL 2007, Part 2
Click for DEX-COOL 2007, Part 3
Click for DEX-COOL 2007, Part 3a
© 2007 All Rights Reserved