wrljet, do you know what the letters in the diagram stand for? (v=valve?). After all, you made us look at it.

 

From the 1999 introduction of the 996 Carrera.
"The implementation of a special coolant means that the coolant does not have to be changed. It must be ensured that only the coolant prescribe by Porsche is used."

And from Scott Slausen on the PCA website.
"Modern antifreeze is 96-percent ethylene glycol, which provides the freeze protection, and four-percent additives. The antifreeze protection is Lifetime on a sealed system. The breakdown can occur within the additives. Silicate antifreezes tend to breakdown at a faster rate than the OAT's (organic acid technology). You used to tell the difference in the two by the color. The OAT's were red and the Silicates were green. However now many manufactures like Porsche use a Hybrid OAT coolant. These coolants come in many colors , such as red, green and pink. So while they may all be 96-percent the same the other 4-percent makes all the difference.

You should only top off the coolant system with Porsche coolant or distilled water. The only time the coolant would be flushed or changed would be do to contamination or engine replacement..

Scott Slauson - PCA WebSite - 5/13/2004"

 

What if Lifetime to Porsche or any manufacture for that matter means sufficiently past the warranty period to get them in the clear and their dealers more repair business. While keeping their customers reasonably satisfied? I for one change my oil more often than recommended. Much easier than changing engines. Same for coolant.
Since brake fluid is more critical to safety I go by Porsche's recommendation since a law suit is just not worth it to them.

 

Here's an idea on some of it. I made these up, so take it with a grain of salt.
Also, while doing the translations I see the circuit diagram I posted is for a diagonal system. I'm sure somebody in a German speaking country with access to Bosch publications could give us the exact terms.

EVVL - Einlassventilvordlinks - Inlet valve, front, left
EVVR - Einlassventilvordrechts - Inlet valve, front, right
EVHL - Einlassventilhindlinks - Inlet valve, rear, left
EVHR - Einlassventilhindrechts - Inlet valve, rear, right

AVVL - Ablassventilvordlinks - Outlet valve, front, left
AVVR - Ablassventilvordrechts - Outlet valve, front, right
AVHL - Ablassventilhindlinks - Outlet valve, rear, left
AVHR - Ablassventilhindrechts - Outlet valve, rear, right

LV - Ladeventil - Loading valve

SpK - Speicher / Kammer - Accumulator/reserve chamber
sRFP - Selbstandsaugendrueckfahrtpumpe - Self priming return pump
D - Druckspeicher - Pressure accumulator
DDB - ??? pressure limiting/regulator

Bill

 

Loren

So if I decide to replace the coolant you recommend 3 gallons Porsche anti-freeze and 3 gallons distilled water from convinient stores??? Why Renntech.org don't provide instruction for coolant flush???

Thanks

 

I don't know what a convinient store is, but I can't believe that you would even consider putting in "regular" distilled water in your porsche.

My car gets a 50/50 mix of Evian and Dasani.

 

How about:
http://www.gerolsteiner.de/index.php?id=162&flash=1

 

MJBird993

Thanks for the recommendation on Evian, I'll do that!!!!!!!!!!

Bill

 

In all seriousness, be sure to never ever use mineral water that's sold at grocery stores in the same plain jugs as distilled water.

Bill