Engine Coolant bleeding

zappiros · 07-20-2009, 02:15 AM

Hello to everyone !!! Long time no see

I need help from somebody.....I don't remember me the correct Steps to bleed the coolant from a 996 engine as they appear on the Porsche Service Manual, (My manual was lost and I just change a cracked expansion tank...)

It was something like:..... keep the expansion tank open until car gets into operating temperature, then open the valve from tank close the cap, bypass radiator vents, rev's every minute to 4000 rps for 30 secs...bla bla bla.... I don;t quite remember how the manual says....

Anyway....if somebody have it, I realy apprecciated, regards to all !!!

It is also very strange that, this instructions are not posted as DIY on renntech...?

zappiros

Paul 996 · 07-20-2009, 10:51 AM

Below is for when you add a center radiator up front but still the same procedure for bleeding the system of air.

Here are steps given in the service manual for bleeding the air from the coolant system:

1. Consider covering the trunk with plastic in case of a coolant overflow.
2. Remove the radiator cap, oil filler cap, and dipstick.
3. Pop the cover trim plate off the filler access area. This reveals the bleeder valve. If you remove the little screw above the trim plate to do this, be extremely careful to not drop the screw into any of the filler necks.
4. Flip the bleeder valve locking clip up to release it.
5. If you have an automatic transmission, remove fuse B1 (the ATF cooler valve).
6. Fill with coolant up to the bottom edge of the filler neck.
7. With the engine idling, occasionally revving the engine, fill up with coolant until there's no more room when the engine is revved. (Revving may raise the level a bit.)
8. Replace radiator cap.
9. Warm up engine until you are sure the thermostat is open. 10 minutes at 2500 RPM should do it, and you should hear the radiator fans come on.
10. Run 5 more minutes at 2500 RPM, revving to 5000 RPM every 30 seconds.
11. Carefully open the radiator cap, and top up the coolant.
12. Replace the radiator cap.
13. Run 5 more minutes at 2500 RPM, revving to 5000 RPM every 30 seconds.
14. Idle until the radiator fans cycle on and off once.
15. Carefully open the radiator cap, and top up the coolant.
16. Put everything back the way it was.

07-20-2009, 02:15 AM	#1
zappiros User Join Date: Apr 2004 Location: Venezuela Posts: 48	Engine Coolant bleeding Hello to everyone !!! Long time no see I need help from somebody.....I don't remember me the correct Steps to bleed the coolant from a 996 engine as they appear on the Porsche Service Manual, (My manual was lost and I just change a cracked expansion tank...) It was something like:..... keep the expansion tank open until car gets into operating temperature, then open the valve from tank close the cap, bypass radiator vents, rev's every minute to 4000 rps for 30 secs...bla bla bla.... I don;t quite remember how the manual says.... Anyway....if somebody have it, I realy apprecciated, regards to all !!! It is also very strange that, this instructions are not posted as DIY on renntech...? zappiros

07-20-2009, 10:51 AM	#2
Paul 996 Addict Rennlist Member Join Date: May 2006 Location: Northern Virginia Posts: 1,499	Below is for when you add a center radiator up front but still the same procedure for bleeding the system of air. Here are steps given in the service manual for bleeding the air from the coolant system: 1. Consider covering the trunk with plastic in case of a coolant overflow. 2. Remove the radiator cap, oil filler cap, and dipstick. 3. Pop the cover trim plate off the filler access area. This reveals the bleeder valve. If you remove the little screw above the trim plate to do this, be extremely careful to not drop the screw into any of the filler necks. 4. Flip the bleeder valve locking clip up to release it. 5. If you have an automatic transmission, remove fuse B1 (the ATF cooler valve). 6. Fill with coolant up to the bottom edge of the filler neck. 7. With the engine idling, occasionally revving the engine, fill up with coolant until there's no more room when the engine is revved. (Revving may raise the level a bit.) 8. Replace radiator cap. 9. Warm up engine until you are sure the thermostat is open. 10 minutes at 2500 RPM should do it, and you should hear the radiator fans come on. 10. Run 5 more minutes at 2500 RPM, revving to 5000 RPM every 30 seconds. 11. Carefully open the radiator cap, and top up the coolant. 12. Replace the radiator cap. 13. Run 5 more minutes at 2500 RPM, revving to 5000 RPM every 30 seconds. 14. Idle until the radiator fans cycle on and off once. 15. Carefully open the radiator cap, and top up the coolant. 16. Put everything back the way it was.