overheating

[jim rose]

the cap shouldnt be boiling over.. perhaps that loss of pressure is whats
helping th e car overheat [doesnt water boil at a lower temp at lower
pressure?]

and the car should just not overheatr on the highway. i lost all the coolant
this winter in tahoe [8000'altitude and 30 degrees american - REALLY COLD]
and the needle never moved past about 1/3 the way up. i also dont get how
the head gasket would cause only that problem.. seems a lot of other stuff
would be wrong too.. is the coolant + oil mixing?  if no, then i doubt the
gaskets bad..

i would bet its a bad / intermittent h20 puump, or a screwwy thermostat [i
think the most likely, especially given the recent flushing + stirring up of
all that sediment]]. the fan keeps it from getting too hot when its still,
if its moving it should be fine... at least mine is, my fan hardly ever
comes on on the highwaym even on hot days.

good luck,
jim



>
>Jim,
>Thanks for the loud thinking,
>I guess that I wasn't clear on the original posting, but when the overheat
>alarm went off, by the time I got to the side of the road, the reservoir
>cap
>was boiling over - hence the loss of the coolant
>I'll check the fan speeds, but at 120 km/h with a 30 km/h headwind at about
>3 degrees celsius, I would expect that the fan would have been freely
>spinning its heart out (pinwheeling?) without power.  I suspect that 5th
>gear at 95 km/h would have overheated the car, whereas 3rd gear at 95 km/h
>would not have - would the lower rpm force more exhaust through a failed
>head gasket, or the water pump would not be able to supply enough flow
>through a clogged radiator (3 years old, exposed to at least 2 engine
>flushes) to keep the car cool?
>Thanks,
>Steve
>----- Original Message -----
>From: jim rose <sf5ktq at hotmail.com>
>To: <steve.sears at soil-mat.on.ca>
>Cc: <quattro at audifans.com>
>Sent: Tuesday, April 02, 2002 11:56 AM
>Subject: re: overheating
>
>
> > steve,
> >
> > have you checked/tested the fan switch[es] and connections? perhaps
>theres
> > an intermittent connection? do all your radiator speeds work [easy
>test]?
> > are you sure the gauge is right? perhaps your multi sensor is screwy?
> >
> > or the flushing dislodged all sorts of crud thats now sticking your
>tstat
> > shut? or clogged the rad?
> >
> > im curious as to why you kept topping up the coolant? if its not
>leaking,
>it
> > shouldnt need topping up..
> >
> > thinking outloud.
> > jim
>
>
>




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