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Purging air from cooling system

my996
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my996 Member

my996

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I will be replacing the overflow coolant tank in my 99 999 C4. I was comfortable using the method described in a thread on the board that describes the process - using the relief value and purging air by a combination of opening the value and letting and cool, etc. etc. However, when I had my car at the shop to replace the alternator the other day, porsche mechanic said the only way to purge the air is to use a pressure system. I think he just wants me to pay him to do it but just in case - Loren, or anyone who might know, what is the correct way to remove the air from the cooling system once I have reinstalled the expansion coolant tank? Thanks

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Loren Member

Loren

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Well if the whole system has been emptied then the best way is to use a vacuum (pull) to fill the system and eliminate air.

If you just added a 3rd radiator or replaced the coolant tank then you should not have lost much coolant - in that case I have found the driving with the purge valve open works fine.

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my996 Member

my996

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Well if the whole system has been emptied then the best way is to use a vacuum (pull) to fill the system and eliminate air.

If you just added a 3rd radiator or replaced the coolant tank then you should not have lost much coolant - in that case I have found the driving with the purge valve open works fine.

anyway to tell if there is air in the system? - also, if I wanted to be anal about this, where can I can a vacuum pump that will help me do this? Any cost ideas?

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