Re: Foaming Coolant (bad?) - Saab Vintage Models Bulletin Board - Saabnet.com
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Re: Foaming Coolant (bad?)
Posted by kansas (more from kansas) on Sat, 7 Jul 2007 12:07:57
In Reply to: Foaming Coolant (bad?), Brendan, Sat, 7 Jul 2007 08:27:52
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How old is your coolant, and what is the antifreeze concentration?
One of the additives in coolant is to minimize foaming. All the additives become depleted with time. Old coolant will foam more than new coolant. Diluted coolant can still look green but be 95% water. The additive content of coolant is optimized for a 50% mix and only in special circumstances is it advisable to use a different mix.
I suggest you flush your system with the heater valve open and the thermostat removed, then fill 50% of its capacity with fresh antifreeze and top off with distilled water. If you have a foaming problem after that, report back. That process will probably fix it.
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