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How many people have switched the coolant they use?
#21
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Join Date: Dec 2002
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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.
I have never seen coolant problems with our trucks, except for water pump gaskets. I will stick with the Dex for now.
#22
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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.
#24
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Originally Posted by BlownChevy
This is what I do......I use the DexCool, with distilled water and change it every 30K.
#26
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.
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.
#27
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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?
#28
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Originally Posted by 422 SS
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.
#30
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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
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