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Old 09-10-2014, 02:39 PM   #1
KrasivataSabine
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Bleeding the Cooling System - Engine on or off?

Hi all,

As you all know, various DIYs suggest running your engine while bleeding the cooling system, while others say just having the HVAC set at 91deg with the fan running is enough. Members on other forums explicitly say this (not running the engine) is enough - I wonder if they have done a full cooling system swap or just an ET replacement. On the other hand, not even Mango's thread mentions starting the engine to bleed the cooling system.

In my case, I have replaced the expansion tank, water pump, and radiator hoses.

Any definitive answers on this? MUST the engine be running to properly bleed the system, or does it depend on which parts you've changed, and from which areas of the system you've drained coolant?

Much appreciated,
Happy mototing
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Old 09-10-2014, 02:43 PM   #2
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I've said it before and I'll say it again. At no time should the engine be running during the bleed procedure. It is not necessary. I've done this 50-80 times on various cars with 100% success rate. First time, every time.
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Old 09-10-2014, 02:45 PM   #3
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Quote:
Originally Posted by Mango View Post
I've said it before and I'll say it again. At no time should the engine be running during the bleed procedure. It is not necessary. I've done this 50-80 times on various cars with 100% success rate. First time, every time.
Needed that definitive answer. Thanks!
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Old 09-10-2014, 03:25 PM   #4
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Always done it as per manual says (attached), engine off at first, then startup to let it warmup
Venting Cooling System.pdf

Draining and adding coolant.pdf
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