Glad to hear this DIY continues to be useful. Re flushing product, I don't really see the need unless you have oil coolant intermix.
Distilled water is good enough and fresh coolant will provide the corrosion protection the engine needs.

 

I use the uview vacuum tool for both refilling as well as evacuating coolant. The Uview comes with rubber adaptors to fit onto the coolant bottle perfectly, then I just use the air compressor to evacuate coolant for the entire system. Mu 997.2 holds about qts of coolant and was able to purge 7 qts without having to remove any hoses. To me, evacuating 7 qts is good enough. Great writeup on the process through.

 

Absolutely. I saw where you were highly regarded for technical advice. Everything I have seen from you supports this 100%. Thank you.

Makes sense on the flush product. There is no evidence of intermix. Flushing with heated water should be just the ticket.

 

If the coolant you're removing is considering a lifetime coolant and you're replacing it with a Porsche approved coolant, what do you expect to gain by flushing it? The only thing left is a bit of older coolant that your engine was just fine with before you drained it. It's a closed system. If the coolant you removed was contaminated it would be a good idea but otherwise why bother?

 

Wow, nice to know it even works on a 997.2! I have not worked on one and have not studied its cooling system yet. Sounds like it's very similar to 996 then.

Thanks! Always fun to exchange knowledge with fellow enthusiasts

 

Not sure if you are directing this at me. I'll field it anyway...

Define "lifetime". The additives break down over time. Plus debris from any number of sources may be introduced.

Personally, I won't be taking a chance on it. I have no knowledge of what was in the car when I bought it. I could test it - but why not start with a clean slate, knowing full well what is going in and at what concentration? Again it can, and will, be tested periodically. If one is opening the system to replace components (waterpump, thermostat, etc.) - wouldn't one want to put a little more investment into it to be safe and provide additional confidence?

I guess that's why I'd bother.

 

^^The smart and safe thing to do, I did too!

 

I'm not suggesting reusing old coolant. I just replaced my water and used the recommended Porsche coolant. As far as I know the coolant was 14 years old. I was wondering more about flushing the system. I'm a terrible writer.

 

I think I got that from your post. In my case, I have no idea if the coolant has ever been changed. The car is 18 years old, with 123k miles. I found a little "salt" on the waterpump. I believe that flushing it will do no harm, and may actually be beneficial. There may be aluminum scale or other impurities in the system that I would like removed. I've got a few things to do before I will start driving the car. This is not holding that up. Why not do it?

 

Great write up! I have used it on my 2001 C2 and it worked perfectly!
I have a third radiator so it took all of 6 gallons of mixed coolant to fully fill mine!!!

If I remember correctly someone mentioned that a name brand fabric softener was a "cheater" product used to flush the oil out of the cooling system when you have oil in it!?
Does anyone know what it was? I think the logic was that the product would not harm the block, heads, lines or fittings unlike some other cleaning products made to flush out your cooling system... but it did a number to the stuck on oil?

 

Warm water and "Shout", IIRC.

 

 

 

 

BTW, you don't need Porsche's coolant with 300% markup. They don;t make coolants and I use Zerex G40 which is 100% .