[s-cars] overheating dilemma

[Jerry Scott]

You may not be getting full water circulation through the radiator and 
some of the channels may be blocked. It may need a good cleaning or 
replacement.  Thats my guess. Try a used radiator.  Some radiator repair 
shops sometimes inadvertently block off some of the core with solder.  
It doesn't leak but it also doesn't transfer enough heat.
It also could be the air flow through the radiator core being blocked by 
bug juice.

Another idea: The impeller on the water pump may not be connected to the 
shaft and is slipping at high rpm.  I have seen this a few times and it 
slows down the circulation of water.

Just a few ideas that I'm sure that you have already considered.
Jerry

Tony Guttmann wrote:

>At the risk of abusing the list with a non-Scar question, my daughter's
>Audi 80 2.6litre V6 quattro is overheating, and we don't know why! The
>radiator, the water pump and the thermostat have all been removed and
>checked. The head gasket has been tested two different ways, and seems to 
>be sound. No water in the oil. No leaks evident in the hoses, cooling system holds
>pressure. Fan sensor has been replaced, and fans seem to kick in appropriately.
>Ambient temperatures here (Australia) are no more than 30C at present (86F), 
>and the situation manifests itself in stop-start city driving.
>
>My mechanic is running out of ideas! Any inspiration from the collective
>brotherhood (naturally, this is used ultra-collectively to include any sisters
>out there)?
>
>Many thanks in advance for any suggetions!
>
>Tony Guttmann
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