[urq] general overheating question

Fri Aug 16 13:53:16 PDT 2013

Check Rockauto.com, there should be a water pump with a steel impeller
versus the plastic one.

On Fri, Aug 16, 2013 at 4:51 PM, Patrick Carlier <p.carlier at pandora.be>wrote:

> So now they use friggin plastic impellors do they .
> Looks like the "german tech guy's "  don't learn .
> On the contrary .
>
> Reminds me of the crappy distributor gears used on the 3B and 7A engines .
> Plastic would desintegrate , distrubutor would lose sync , engine failed
> .
> No spare parts obtaniable , only the entire dizzy , at top prices
> naturally .
>
>
> Lucky you found the problem , and even more lucky you're able to repair it
> yourself .
>
> Pat
>
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> ----- Original Message ----- From: "Keith" <spotatashleys at hotmail.com>
> To: <urq at audifans.com>
> Sent: Friday, August 16, 2013 10:09 PM
> Subject: Re: [urq] general overheating question
>
>
>  Many thanks for all the suggestions and advice. Following day one
>> (henceforth regarded as a "clutching at straws day") when I made the
>> posting seeking your help and guidance, I continued to investigate and
>> discovered the following: -
>> Fitted brand new reservoir cap
>> Ran car up to 90c and over.
>> Coolant reservoir contents remained cold. (opened this with engine stopped
>> and dipped finger but whilst gauge showing car to be overheating )
>> Top hose was hot.
>> Hose from coolant reservoir down to bottom of rad/bottom hose was cold.
>> Radiator felt cold
>> Water hoses to oil cooler were hot.
>> No coolant loss during these tests.
>> No water returning to the reservoir via the small bore pipe.
>> Still no heat at all from heater/climate control.
>>
>> Then following much research on the net which only sought to confuse
>> because of conflicting opinions on symptoms/causes and the fact that many
>> helpful videos are for the A4 with the 1.8T or the A6 with V6's or V8s none
>> for the A6 with the 1.8T, I gave up, weeded the garden and mulled it all
>> over.
>> Today I dived in and started with the thermostat...took out the old one
>> (which is less than a year old), tested it in a saucepan. It opened as it
>> should at 87C. But as luck would have it, if you have a long enough fingers
>> you can feel the water pump impellor through the thermostat aperture (after
>> having removed the thermostat). If you can turn or move the impellor it is
>> kaput. Mine felt as though it has fallen to pieces. So at least I now know
>> what the problem is. I hope it has not seriously broken up and sent bits
>> around the motor.
>> I've been and bought a new water pump, this time with a metal rather than
>> plastic impellor) and timing belt kit (tensioner and idler etc) and have
>> started to make my way in towards the water pump. Nothing has given itself
>> up easily so far. I never thought I'd say this but in comparison, I now see
>> the urq is a joy to work on. In many ways "progress" in cleverly packaging
>> engine bay components has become inverted. I guess all is fine as long as
>> nothing goes wrong.
>>
>> Thanks again for the help. I really appreciate it.
>> All the best
>>
>> Keith
>>
>> '87 WR  which has been great in getting to the motor factors for the A6
>> bits.....sunny day, shades, fast car, Fabulous Thunderbirds on the
>> player.... not so bad after all eh? Time for a beer.
>>
>>
>>
>> -----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).
>> 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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