84 4ksq Radiator Fan Question...How High?

[LL - NY]

FWIW, there is no purge valve on a 4KQ. I've gone as far as just running
the car with the reservoir cap loose until the fan kicks in as a method of
bleeding my 4kq. No problems after the bleed.

LL - NY

On 12/4/06, L DC <ldc007usa at yahoo.com> wrote:
>
> To add to Huw's input.
>
> Have flushed and/or refilled the coolant/H2O?
>
> If there is air trapped in the cooling system, liquid
> won't circulate properly and, thus, fan switch,
> located at the bottom of the radiator as Huw
> indicated, won't kick in.
>
> If there is air in the system, purge it. I forget if
> your system (usually on the radiator) has a purging
> valve. Anyway, the way I purge it in my car is by
> leaving the reservoir cap off and let the engine run
> at idle until warm and liquid starts to bearly
> overflow over the neck of the reservoir cap. If liquid
> level falls down as air gets out, fill with liquid
> during thr process.
>
> Put reservoir cap on and turn engine off. Start engine
> again and let it run at idle some more, while watching
> temp gauge as well as to see if fan kicks in.
>
> Let the car cool off and then take reservoir cap off
> again, which should be pressurized and liquid level
> perharps lower.
>
> Top off with coolant/H2O and repeat process as needed
> until fan comes on on its own, provided the fan,
> relay, harness in working order.
>
> The fan itself could be failing.
>
> Both of the above has happened in my car. I now have a
> manual switch, relayed, running to the fan on the high
> speed setting just in case the fan switch fails; I've
> been there also.
>
> -Reagards,
>
> Louis
>
>
>
>
> --- Huw Powell <audi at humanspeakers.com> wrote:
>
> >
> > > I'm beginning to suspect that the radiator fan in
> > my 84 4ksq is not going to
> > > "kick-on" soon enough to avoid blowing the (upper)
> > radiator hose.  All
> > > connections to all fittings appear to be solid…and
> > I even a have a few
> > > relatively recent electrical components in the
> > cooling system.  I'm losing
> > > my nerve relative to sitting in the car watching
> > the temperature gauge and
> > > keeping my fingers crossed that the hose doesn't
> > blow.  I let the gauge go
> > > at least ¾ of the way up.  Should I just stop
> > whimping-out and let it
> > > go?...or is there a quick way to by-pass the rest
> > of the cooling circuit to
> > > check the function of the radiator fan?
> >
> > The sender for the fan is in the bottom rear of the
> > radiator.  Shorting
> > its connector out should make the fan run.
> >
> > The sender does this by turning on relay #2 which
> > sends battery power to
> > the fan.  That relay should also be tested or
> > replaced, and can be
> > jumped to, again, run the fan.
> >
> > You can also run heavy jumpers to the fan motor
> > directly from the
> > battery to see if it runs.
> >
> > While running the engine up to that 3/4 position on
> > the gauge, you can
> > measure the sender's resistance, it should go from
> > infinite to zero at
> > some point.
> >
> > You could remove it and test in a pan of water as
> > you boil it, but then
> > your coolant would pour out of the radiator.  Unless
> > you have a spare
> > sender to screw in its place quickly.
> >
> > --
> > Huw Powell
> >
> > http://www.humanspeakers.com/audi
> >
> > http://www.humanthoughts.org/
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> >
>
>
>
>
>
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