[DeTomaso] cooling noises

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I'm back from the PCNC tech session, processing  photos and I guess I'm
ready for another WAG diagnosis...

I believe what you are hearing is boiling at "hot spots".  I think it
happens when there is a little air in the system.

I've heard it before on my car, soon after the coolant system was opened up.
Even though I thought I
purged the system completely.  My overflow bottle (the hose between the two
bottles) has a good seal.
So I let the system work out the bubbles.  Hot coolant expands, and pushes
excess into the second bottle.

When it cools and contracts, it will suck coolant back.  As long as you have
no leaks, it 'may' eventually work it self out.
(Otherwise it sucks back air and you perpetuate the problem.)

But the next time my system was opened, I jack up the rear higher (I also
have a slopped driveway) and REALLY
purged.  Note you need to run the engine until the thermostat opens to get
the air trapped behind it.

So if it is not much air bubbling, it MAY work itself out.

Good excuse to drive it regularly!  Hey honey I have to work out the
bubbles!

Chuck


-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com]On
Behalf Of dyogi
Sent: Saturday, April 21, 2007 8:17 PM
To: detomaso at realbig.com
Subject: [DeTomaso] cooling noises

I finally got the '73 on the road after the cam/head swap. All seems to be
running well, temp runs cool as it always has, good power etc. My one
problem that I have is a strange noise coming from the water pump. It's a
boiling/percolating noise that starts after the motor has warmed up. The
noise continues after the motor is turned off until it cools and settles.
The water pump is an aluminum high flow anti cavitation model and is brand
new. As I said, the car is running cool (185-190 degrees) Is this air
trapped in the water pump area? I've tried purging the system but the noise
persists. Thanks in advance.


Aloha from Hawaii,

Dennis
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