Quote:
Originally Posted by j cAT
If you have not used dexcool with distilled water with at least 50% concentration , the corrosion affects the gaskets ...common failure is like the water pump / engine mounting gasket...It could also be the heater hose connections at the firewall...
your coolant system capacity is 4.5 gallons...so If you flush out the system and DO NOT DRAIN THE ENGINE AS WELL , this means you will only get out 2 gallons of coolant with the radiator drain plug ...
when servicing this system you must install about 2.5 gallons of coolant...then the rest with distilled water ...
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j cat,
I only use Dexcool and 50/50 mix with distilled water. When I did the coolant, I removed the tstat and used a large vacuum pump to remove as much as I could. I am pretty sure I got over 4 gallons out of it.
When I pressure tested it, it held 16 psi for an hour but I did the pressure test while the engine was off.
//2000CAYukon