[s-cars] overheating dilemma -- the saga continues

[djdawson2 at aol.com]

I would check for good flow accross the radiator.  The easiest way to do this is to jump the electric fan so that it is running full tilt (this is done after the car is starting to overheat).  Once the fan has provided a few minutes of strong airflow, feel the radiator.  If the whole thing is hot, you have good flow, but some other issue is causing your problem.  If one side of the radiator is cool, but the other side is hot, you have a flow problem.  I would narrow that down first.
 
Dave
 
-----Original Message-----
From: Tony Guttmann <T.Guttmann at ms.unimelb.edu.au>
To: s-car-list at audifans.com
Sent: Sat, 25 Feb 2006 12:07:45 +1100
Subject: [s-cars] overheating dilemma -- the saga continues


Thanks for all the suggestions as to possible causes of the overheating
of my daughter's Audi 80 2.6litre V6 quattro as posted last weekend. As
I kind of expected, my mechanic was aware of, and had tried to rectify,
all those possibilities.

After somewhere between 30-40 hours of labour (which happily he largely won't
charge for), he is convinced that the fault lies inside the engine, either a
blocked water path somewhere in a head or the block, or possibly even a cracked
block, though there is no other evidence of the latter. Rather than do an engine
strip down, he is testing a thermostat bypass system with a temperature sensor
that will kick in when the water temperature gets above 90C or so, and turn on 
the
electric fans. Any insights, or good ideas as to how to deal with this 
situation?

To add to our woes, the increased pressure in the system has damaged the core of
the heater, which involves 6-7 hours labour puling the dash apart to get to the 
heater
core! Fortunately it's summer here, so that task can be delayed!

TIA as usual.

Tony Guttmann

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