[V8] Overheating, loss of electric fan 92 V8 4.2

[Dag Bøsterud]

I have now replaced my radiator (OEM), flushed the system (once more) and replaced both temp senders,
the temp sender in the radiator is disconnected. The A/C is turned off.

The car still runs hot!!! At least according to the gauge. There is no change as to before.
I did a 340 mile-trip this weekend, and the temperature varied from 210 to 220 F when driving at speeds
from 45 to 75 mph. Only when going quite fast (80-90 mph) would the temperature drop to about 190-195 F.
Setting the heater to "HI" will also produce a massive temperature drop - down to about 190-195 F.

...but as I wrote earlier, this is just according to the gauge. Is it common that they are faulty?

The car uses no coolant or no oil, so I have no reason to suspect that there's something wrong
with the engine. When I have parked the car for a short period of time after I've driven it, and I start
it up again, the temperature will probably be at about 230 F. It goes right down to 210 in a matter of seconds,
even if I just idle.

It's not a big problem now, we've had a cold summer here in Norway. But what if we get a hot summer
next year (about 85-90 F), I'm using the A/C, and have to stop at some intersection? Will I have a meltdown? :)

/Dag Bøsterud
Norway

92 Audi V8 4.2

  ----- Original Message ----- 
  From: QSHIPQ at aol.com 
  To: dag.boesterud at consulgranada.net ; cobram at juno.com 
  Cc: V8 at audifans.com 
  Sent: Wednesday, July 18, 2007 1:53 AM
  Subject: Re: [V8] Overheating, loss of electric fan 92 V8 4.2


  Just a data point.  Before I determined the gauge was bad, I could turn on the heater and get an indication of a reduced temp as well.  Hence my misdiagnosis of a bad rad.  Again, ck the temps with an IR gun.  The best success is to zap the head right where the temp sender is (front of head on drivers side, 2 pin connector).  After that test, I would do a pressure test (for heater core leak).

  Right now, my head temps will rise to 210 (3rd speed fan comes on normally) gauge shows beyond 3/4 hot, and the clue to me was the overtemp shutdown of the A/C never came about.

  My .02

  Scott J


  In a message dated 7/17/2007 5:06:04 P.M. Central Daylight Time, dag.boesterud at consulgranada.net writes:
    I feel that things are THAT hot. It might be my imagination, but I feel that 
    it shouldn't be that hot from just driving 1,5 miles..

    I've added added a bottle of cooling system flush, and the color of the 
    coolant has started to go from red to grey... maybe there is some clogging 
    after all?

    /Dag



    ----- Original Message ----- 
    From: <cobram at juno.com>
    To: <dag.boesterud at consulgranada.net>
    Cc: <V8 at audifans.com>
    Sent: Tuesday, July 17, 2007 10:39 PM
    Subject: Re: [V8] Overheating, loss of electric fan 92 V8 4.2


    > <dag.boesterud at consulgranada.net> writes:
    >
    >> What I have noticed is that when the temperature gauge starts to move
    >> in to  the 220-230 F-range, if I put the
    >> climate control to "HI", the gauge quite rapidly drops to about 210
    >> F.
    >
    >> That's another reason to suspect a clogged radiator... or am I
    >> wrong?
    >
    > You could be right, or not.  What you're doing by turning the heat on HI
    > is using the heater core as an auxiliary radiator.  Doesn't really tell
    > you much about why you may be running hot.  It does help determine that
    > the water pump is OK.






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