[urq] "Burping" Cooling System?

[Brandon Rogers]

Hey Steve.  I've always just released any pressure (carefully unscrewing the
reservoir cap) after the first few drives after refilling the system.  But
you've had the car running for a while, correct?  Not sure why air would
suddenly make itself known.

I think I would check the t-stat, make sure the water pump is okay, and test
the fan.

Of course what I would do and what you _should_ do may very well be two
different things!

Brandon 

-----Original Message-----
From: urq-bounces at audifans.com [mailto:urq-bounces at audifans.com] On Behalf
Of k1drbar
Sent: Thursday, February 05, 2009 11:29 PM
To: urq at audifans.com
Subject: [urq] "Burping" Cooling System?


The other day old qtc222 started overheating on me.  I hadn't had a chance
to look at it, but yesterday I took it for a neighborhood errand . yes, I
did have a *little* fun, but cooled down the last couple miles . but the
pressure relief on the coolant cap blew a little when I shut it down.  I
spent a few minutes with it tonight . I think I've got air in the system
somewhere.  I opened the system up at the high points and routed the small
hoses intended to bleed air so that they had no dips; it isn't clear that it
made any difference . I drove around keeping the manifold pressure at 1 bar
or less.  The car normally sits nose high in the driveway, tonight I backed
it in to allow the reservoir to be the guaranteed highest point.  It seemed
that both radiators were getting hot, so I'd think there was flow, but I
don't know how to be sure that any air has been worked out.  In all my years
I have to say I've never had an issue with air in the cooling system before
. 

 

I was thinking the problem might have been the thermostat, but it seems I've
got flow into the radiators, so I think I've absolved that.  I might pull
the cover just to make sure the bleed hole is oriented correctly (if it has
one).  I think I'll flush the coolant system out this weekend . the coolant
was clean before, but after the messing around I did today there's a bit of
a rusty tinge now.  

 

Steve B

San Jose, CA (USA)

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