StupidFast

I know some S-10s have problems if they run dex, the whole coolant system with look like rusted mud. It has something to do with poor electrical design or something. I know our tranny guy talks about older trucks (early 80s I think) with 400s in them used to burn up planet gears. Poor body grounds, or something, caused the voltage to ground through the transmission. Crazy stuff.
I have never seen coolant problems with our trucks, except for water pump gaskets. I will stick with the Dex for now.

10.5 Dave

iTrader: (5)

I'm sticking with Dex-cool.I put 183,000 miles on a 96 350 vortec and flushed the coolant once at around 100,000 miles.No issues at all.If it bothered me I would just change the Dex-cool more frequently instead of switching to the old stuff.I'm not a chemist but it seems to me that gaskets or metal parts in the engine could be compromised by using something that GM didn't specify.

BlownChevy

iTrader: (20)

This is what I do......I use the DexCool, with distilled water and change it every 30K.

Snake Eater

How do you get a good flush with distilled water and no pressure pushing it? I bet thats gotta take like 15 gallons or more.

StupidFast

You don't need to power flush it. You just need to change motors every year or so.
Take me for example. 5.3, 6.0, and a 5.7 in less than 50,000 miles.

2003Silvyrado

Not to be an ***, but wouldn't GM recall the dexcool if it was fking up gaskets? It would seem like they use it for a reason.

I've seen the junk gum up on vehicles, but only on those where the coolant has never been changed. Either way, I wouldn't leave it in there for five years.

01Tahoetwinscrew

only the older style vortech motors could have issues with intake gaskets as the LS-1 type motors don't even have coolant running through their intakes. The little metal tubes with the o-ring style gasket and the head gaskets are the only thing to worry about. Its for sure that every pre 99 motor(5.7) has had the intake gaskets replaced around 70K or so due to an issue with sealing that may be attributed to dexcool...but who knows?

zombie1

What he said!

unredeemed

iTrader: (2)

It's funny the Subaru camp with ther turbo 4 cylinders will switch to red fluid like those used by Toyota. Here we want to go to green. Ha, there will be no end to this one...

LS1csherm

Dexcool and the green cannot be interchanged or mixed per the manufacturers.
If a motor or cooling is started out on Dexcool - stay with Dexcool and vise versa
There is a gasket problem when going from Green to Dexcool - there is no way to completely remove all the Dexcool from a cooling system and there is a known gasket problem when going from green to Dexcool.
Dexcool is extremely sensitive when a system is low on coolant and air enters the system -
Dexcool systems are also extremely sensitive to the OE weighted vacume valve rad cap - one fix is to replace the cap with an aftermarket spring valve cap

On the electrical portion - the cooling system does conduct electrical current in the cooling system - there have been reports on electrical gremlins when the cooling system is not properly grounded.

On the water pump issue the main problem for pump and impeller corrosion is due to low coolant level which cause - caviation/errosion corrosion
The low level causes the pump to caviate - which is pumping air vs liquid - bubbles form then are collasped - this bursting causes errosion of the pump and impeller.
One mag I subscribe to is Motor - they go indepth often about NOT switching the 2 coolants or changing over.
Check Motor mag August 2002