Re: 1969 Camaro Coolant Flush/Replacement
Some more tips:
remove/replace with petcocks, the drain pligs just above the oil pan rail, 9/16 inch hex, I think.
Use an impact socket on removing them as GM hired a gorilla in tightening them.
Replace, your choice, with petcock for later draining.
If you replace thermostat, drill a couple 1/8 inch diameter holes in the flange allowing escaping of air when filling.
By design, and no EPA then, GM did not include an expansion tank. As the coolant heated up, coolant was forced out and if leak free, maintained a level about 1-1/2 to two inches below the filler cap.
Also, while thermostat is out and drain plugs removed, one would take a garden hose and direct flow to either side of block for removing sediment in the lower water jackets.
Also,, remove a hjeater hose and shove water through it through the heater core as this action flushes the core.
Once done flushing, reconnect all items removed, and pour in a 50/50 mix, distilled water is good the use, and let engine run for opening the t/stat and continue filling.
The next day, after she has cooled overnight, remove rad cap and add appropriately new coolant.
the hoses usually get replaced at this time. No twisting of hoses from heater core as this action may damage the core, then it will need repair. Repair old core is suggested.
Use X-Acto knife carefully, no scratching the nipples as this will create a leak, for splitting hose and smear petro jelly on inside of new hose for good slipage onto and off nipples, housing, and radiator later in life.
Some replace fan belt also and adjust belt after a couple hours running, as they do stretch.
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