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Originally Posted by pothole
With respect, two events are probably unrelated. If your coolant has never been flushed, I'd say it's a good idea to do it ASAP regardless of whether you have a new or old expansion tank. They don't all split. My '97 still has its original tank. I replaced my coolant when I fitted new rads and pump a while back.
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... first, I believe both events are related.
I have always said that the coolant reservoirs tend to crack when there is air in the system.
By having flushed the coolant it is very likely that some air was left in, causing the crack some time later.
Most of the coolant reservoirs (not to say all) that I've replaced had has the coolant replaced within the last year or so.
My coolant reservoir is still OEM. It is 13.5 years old and has 208,000+ miles.
Second, don't flush if you don't have to.
Porsche says it's a lifetime coolant and it is.
When I installed my 3rd radiator at 125,000 I saved the coolant and reused it.
It was clear and looked new.
At 203,000 miles the engine broke a piston rod and the coolant again was crystal clear.
The cooling system is a closed system. Nothing should enter to contaminate it unless you either put it in yourself or oil penetrates because of a bad oil radiator cracked cylinder or bad head gasket.
Happy Boxstering,
Pedro
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