Enthusiast
Changing Antifreeze
I'm sorry, but I have to admit that my 2005 Duramax with 147K miles is still running on the OEM fill of Dexron antifreeze. If I pull the lower radiator hose off, drain the antifreeze, reconnect it and fill with water, doing this at least 2 times, will one gallon of straight antifreeze fill it up, considering that there is a fresh fill of water remaining in the block ??
2005 Chevy 2500HD, CC, SB, 4X4, Duramax, ARE Topper, 60 gallon RDS toolbox/tank combo, Kennedy Headlight Booster, Isspro pyrometer and boost gauges, EGR Blocker, PCV Kit, Bilsteins, 265 Michelin MS-2, TTS Exhaust, pulling 35' Jayco travel trailer.
Administrator
Considering the coolant capacity is over 5 gallons, you'll need more than 2.5 gallons Dexcool to get the 50% mix. Use only distilled water for flushing or mixing.
The 2-3 times flush method is OK, but you don't need to remove the lower hose. It has a decent drain valve. There also block drain plugs that should be pulled.
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