quattro Digest, Vol 16, Issue 50

[Steve Sears]

Vladimir,
The coolant only flows thru that hose when it overflows from the engine.
The flow from the pump is through the large hoses.  I had problems with very
high temps in my 5ktq - it turned out to be a combo of:
1. Blown head gasket - cylinder #5 (by the firewall) had a leak into the
coolant jacket.
2. Blown gasket on radiator - the gasket on the end of the rad that
separates the in and out ports was broken between the two sides.  A large
amount of hot coolant would bypass the rad, and thus keep the temp way high.
For issue 1: Coolant in oil/Oil in coolant check/white residue on sparkplug
checks.  Hold an inspection mirror over the spark plug holes with a warm
engine - where there's fog, there's a coolant leak into the cylinder.
For issue 2: When the car is up to running temp, check to see if the
radiator is uniformly hot.  Mine was super hot where the large hoses came
in, but less so towards the other end.
Cheers!
Steve Sears
1987 Audi 5kTQ
1980 Audi 5k
1962 and '64 Auto Union DKW Junior deLuxes

----- Original Message ----- 
From: vladimir mitic <vladimirmit at gmail.com>
Subject: Re: Please urgent help needed high engine temp!
To: Duncan Thomson <duncan at systemcontrols.co.nz>
Cc: quattro at audifans.com
Message-ID: <b45b21e305021602243774d75a at mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1

I cheked the thermoswitch and it is OK, fan also work fine. I also
changed the termostat (mechanical termo switch) and complete
antifreeze (7 liter). Could it be poor water flow becouse waterpump? I
suspect that becouse no water comes aut of that small hose from top of
the radiator to water container when engine idle. Only when is about
so hot to turn on the fan on, 1 or 2 sec. before water go thru that
hose. Any ideas? I need help becouse that is my only car. How hot your
audis run? In C°? Is there any data from the factory what is normal
working temp?
Thanks.



On Wed, 16 Feb 2005 22:46:05 +1300, Duncan Thomson
<duncan at systemcontrols.co.nz> wrote:
> vladimir mitic wrote:
>
> >What is normal winter temp. on your audis? I like this
> >car very much and I fear to drive it with that engine temp. Please
> >respond, with any help or data!
> >
> >
>
> No, this is not normal, you have a problem. My similar problem turned
> out to be the thermoswitch which runs the fan. Basically then fan was
> only turning on intermittently even at very high temps, and it never ran
> at high speed.
>
> When the car gets hot, check to see if the fan comes on and *stays* on.
> The thermoswitch is located at the bottom of the radiator and will have
> two or three pins. If you short out 2 of the connectors in the wiring
> loom, it should run continuously.
>
> There are plenty of other things that will cause overheating, but this
> is easy to check for, ancd solved it for me.
>
> Hope this helps...
>
> Duncan
> '88 90Q
>
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