[urq] Fw: general overheating question

[Keith]

Well, I've fixed my A6 water pump problem - all done and back together. It 
just won't start now.
The timing marks are spot on. It turns over and there is fuel getting to the 
plugs. It just won't fire.
I have access to a fault code reader but not a VAG-COM. I had a fault code 
for low battery which was because I disconnected it to do the work. I have 
cleared this code and it has not recurred.
I have no other fault codes. I can't understand it.
It always starts as soon as the key is turned. Now it doesn't even sound 
like it is trying to start.
All that was disconnected electrically to do this job were: fog lights, 
horns, throttle body and battery.
Any suggestions to resolve this desperate situation gratefully received.
Regards

Keith

'87 WR

p.s. the pump was a picture. Impellor had broken through all the blades and 
in two halves. I was expecting it to have come off the spindle but the 
centre of the impellor was still on the spindle, the blades had cracked off 
in to two halves. All there apart from one smallish piece which I guess is 
somewhere in the system which is a worry but I can't do much about it. 
Nevertheless a good reason not to buy water pumps with plastic impellors 
when changing pumps.

-----Original Message----- 
From: Keith
Sent: Thursday, August 15, 2013 6:20 PM
To: urq at audifans.com
Subject: [urq] general overheating question

Evening All

Apologies for this being a bit off (urq) topic but I could really do with a
bit of general diagnostic help with an overheating issue on our Audi A6 1.8t
(2001). Engine code AWT
The symptoms are:
Sudden overheating issue.
No steam
No bursts
The coolant level had dropped a little but there were no obvious leaks
although there was some coolant on the lip of the coolant reservoir
suggesting that this might have blown out past cap through overheating. The
low coolant level alarm sounded when this all occurred which drew my
attention to the temp gauge. Got towed home to hopefully now fix it.
The oil seemed to have got hotter than normal too.
Bought new filler cap to rule this out.
Then.....
Starting from cold, it rises very quickly to 90c (normal operating temp),
hangs there for a bit and then goes on rising.
Viscous fan and electric fan both working fine and when they are supposed
to.
Heater just blows cold air even when overheating.
Whipped plugs out – all normal colour.
Tops of pistons look normal – no evidence of steam washing.
No obvious evidence of oil in water or water in oil.
Engine starts fine and runs as smooth as normal.
Thermostat is less than 12 months old. Changed when previously car was not
getting warm!

My two main suspects are thermostat despite it being almost new and water
pump.
Have I overlooked anything simple and blindingly obvious?
Before I start taking it all apart though, what can I do to narrow this down
to the the definite culprit?
I really need to fix this by Monday when I have to use it for work (no
pressure eh?) so any suggestions of next steps will be greatly appreciated
(as always).
Cheers folks. Will look forward to hearing from you.

Keith
‘87 WR


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