Re: V8 Running Normal Running Temps

[Ralph Cook <bluesgtar@redrose.net>]

William,
I am experiencing similar high temps. My Audi gurus tell me that they
checked the sensors and the fan but that the control unit which is
...are you ready? ...a part of the instrument cluster! is the source of
my problem. A new instrument cluster? $1,250.00 one from a wreck might
be available but I haven't tried because the car stays stable (95C)with
the A/C on. I will probably be looking for a used insrument cluster this
fall.
Ralph Cook
1990 V8Q The problem car and daily driver.
1993 V8Q ...Ah' keeps it at home 'cept for speshul occasions.

Wilbah@aol.com wrote:
> 
> Something to look at (before checking all of the gauges) is whether the
> electric cooling fan is running independently of the A/C.   I say this
> because the cooling fan in the V8 has four different speeds.  Thus, four
> different relays, fuses etc...etc..etc...   However, the fan automatically
> comes on with the AC (albeit only at the first/slowest speed).   Basically,
> you'll know if the fan is working -turn on the AC and see if she spins.
> After the engine gets hot, turn off the AC, if the fan goes off you'll know
> it's most likely a sensor, or something causing the fan to not get juice.
> 
> My V8 had a problem with the cooling sensor, which was dead.  Basically at
> highway speeds the car ran at just under 100c, but in some traffic, after a
> highway drive, it got dangerously hot.  I ordered the sensor, (and had the
> dealer install it) for a little under $200.
> 
> Some food for thought though................I would find during this period
> that if I shut the engine off for a few minutes the temp at startup would be
> insanely high 120c +.  I figured that like most other Audi's, the cooling fan
> would stay on after you turn the car off. In my '86 4000s the cooling fan
> would stay on for minutes after I shut it down......NOT the case on the V8,
> (or at least not in the '90 V8).  I figured that this was a problem on my
> car, but when I asked the tech at the dealer he told me that the cooling fans
> don't stay on after shut off.......Could this be true?   It just seems a
> little silly to me that with all of the other stuff built into the V8,
> keeping the fan on for a few minutes after a long run would be beneficial.
> Is this something unique to the earlier years, or do they all do this?
> 
> -William