Antifreeze Change Over to G05
I am just looking for confirmation that I did an acceptable job of flushing the coolant on my 67 327 before switching to G05--it had Prestone (the green stuff) which was between 2-3 years old, done by the prior owner.
I removed the expansion tank cap, pulled the block drain plugs and opened the radiator petcock and let everything drain out, and with the plugs still removed and petcock opened, ran fresh water from the hose stuck in the expansion tank, until all three openings were running clear water, and let them run for a good 5-10 minutes afterward. Then reinserted block plugs, closed petcock, filled with water and ran engine until themostat opened. Drained, and did the same 2 times before finally adding 2 gallons G05 in the expansion tank, and filled the rest with distilled water.
I initially planned on pulling the heater hoses to back flush the heater core (which like the coolant I replaced is 2 going on three years old). But mine's an AC car with parts installed I wasn't expecting (there's a 3 way T and some form of diaphram close to the inlet of the heater core, and I didn't want to fool with any of those hose connections). Also, there was not a great deal of slack in the heater hoses to make a length-wise slice of 1/2" or so, in order to remove them.
Since the heater hoses and radiator hoses are less than 3 years old, I figured leave the hoses alone and run water through the system as described.
The total fill was a little less than 14 quarts, so there was still roughly two quarts somewhere that did not drain out from the engine block plugs and radiator petcock. As best as my eyes could tell from the 3 drain, refill with water, run car until thermostat opened cycles, everthing was running clear water before I did the final fill with G05 topped off with 1 1/2 gallons of distilled water.
Worst case scenario and there is somehow a residual mixture of the old Prestone/water mix left, I assume I am OK. It's hard to find anything definitive on whether G05 creates any issue if there is some residual green prestone still in the coolant system/hoses.
And I figure for the next coolant flush I will do it in June 2013 (2 years instead of 3-5 years), and then maybe go to 3 years thereafter.
Just wanting a sanity check, while I am still off work this week and have the time for a re-do, if I totally missed something. Am I OK?
By the way, I was expecting the G05 to be yellow (not sure why). It was clear coming out of the gallon jugs. I thought, well that's interesting. Sure makes it tougher to see any drips.
I did install the block drain plugs with some pipe dope, just snug (using my 3/8" ratchet with maybe a quarter turn beyond finger tight), and closed the petcock finger tight. Everything looked good--no stray drips. I was a little apprehensive about using the petcock, as I had read posts about them not closing after being opened. Mine was very clean (Dewitts radiator less than 3 years old), and all of the nasty looking flow came from the engine block drains. So I considered myself fortunate on that score--saved me a trip to the autoparts store for a new petcock.
I removed the expansion tank cap, pulled the block drain plugs and opened the radiator petcock and let everything drain out, and with the plugs still removed and petcock opened, ran fresh water from the hose stuck in the expansion tank, until all three openings were running clear water, and let them run for a good 5-10 minutes afterward. Then reinserted block plugs, closed petcock, filled with water and ran engine until themostat opened. Drained, and did the same 2 times before finally adding 2 gallons G05 in the expansion tank, and filled the rest with distilled water.
I initially planned on pulling the heater hoses to back flush the heater core (which like the coolant I replaced is 2 going on three years old). But mine's an AC car with parts installed I wasn't expecting (there's a 3 way T and some form of diaphram close to the inlet of the heater core, and I didn't want to fool with any of those hose connections). Also, there was not a great deal of slack in the heater hoses to make a length-wise slice of 1/2" or so, in order to remove them.
Since the heater hoses and radiator hoses are less than 3 years old, I figured leave the hoses alone and run water through the system as described.
The total fill was a little less than 14 quarts, so there was still roughly two quarts somewhere that did not drain out from the engine block plugs and radiator petcock. As best as my eyes could tell from the 3 drain, refill with water, run car until thermostat opened cycles, everthing was running clear water before I did the final fill with G05 topped off with 1 1/2 gallons of distilled water.
Worst case scenario and there is somehow a residual mixture of the old Prestone/water mix left, I assume I am OK. It's hard to find anything definitive on whether G05 creates any issue if there is some residual green prestone still in the coolant system/hoses.
And I figure for the next coolant flush I will do it in June 2013 (2 years instead of 3-5 years), and then maybe go to 3 years thereafter.
Just wanting a sanity check, while I am still off work this week and have the time for a re-do, if I totally missed something. Am I OK?
By the way, I was expecting the G05 to be yellow (not sure why). It was clear coming out of the gallon jugs. I thought, well that's interesting. Sure makes it tougher to see any drips.
I did install the block drain plugs with some pipe dope, just snug (using my 3/8" ratchet with maybe a quarter turn beyond finger tight), and closed the petcock finger tight. Everything looked good--no stray drips. I was a little apprehensive about using the petcock, as I had read posts about them not closing after being opened. Mine was very clean (Dewitts radiator less than 3 years old), and all of the nasty looking flow came from the engine block drains. So I considered myself fortunate on that score--saved me a trip to the autoparts store for a new petcock.
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