Bleeding coolant system

[fahrvergnugen at cox.net (David Utley)]

Ed,

  The best way I have foudn to bleed the system is first to top it off as
much as it will take.  Next, keep the cap off of the bottle, and start the
car.  Run it at 3.5K until the fan cycles.  At some point, the coolant will
drop (when the T-stat opens) and you should have to top it off again.  The
reason you run it at 3.5K is that the pump often will not make enough
pressure at low RPM to displace the air, esp. in the 16V motor.

Try that and let us know what happens...

David
----- Original Message ----- 
From: "Edward Effinger" <Eeffinger@conestogac.on.ca>
To: <scirocco-l@scirocco.org>
Sent: Wednesday, February 01, 2006 9:07 AM
Subject: Bleeding coolant system


Greetings.
Put on the new water pump last night, put some antifreeze in the rad and
started the car.
No leaks, just waiting for the motor to warm up and then continue to top up
the rad.

The lower rad hose never got warm, so suspecting a sticky thermostat, put in
a new one.

Same thing!

The rad would heat up and start steaming but the lower hose was cold.

Put the cap on, ran it till warm and everything worked fine.

The old thermostat was a 92C, the new one is 180F.

Why did the system need pressure to open the thermostat?

Thanks
Ed

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