proper engine temp. (was Heater Core Problems on 1989 90)

[Dave Hord]

Hmmm,

And I get sub 130 degrees C year round with 10w30 in the winter and 20w50 in
the summer.  It will track up to 130*C during a track day.  Please note I
haven't had A/C so I can't comment on it's effect on the oil temps.

Oil Temp, imho, should _always_ reach at least 100*C in order to boil off the
condensation and other crap that gets into it...regardless of the season.  If
the H20 cooling system is working correctly, it should be regulating the
temperature year round...and always at the same time. Up here in Canada I've
never experienced lower temps in winter...unless it's minus 30 degrees, or
there is something wrong with my car.

I'm not saying there is anything wrong with your car...but it is curious indeed.

As for whether the gauge is correct, I'd guess no. 10% off wouldn't be an
unfair assumption.

The big question, I suppose, is are you sure your rad-fan is turning on
correctly?  The thermostat is supposed to control engine temperature during
warm-up and while driving. The rad fan controls engine temps while stopped (as
there is no airflow)...but the rad fan ALSO supplements your driving airflow
when needed.

Thinking about the 'problem' further, I could see an argument being made for
speed '1' on your fan not working properly.  It could be possible that your
engine thinks it's switching to speed one, but the fan isn't working...the temp
creeps up and eventually speed two kicks in, evening out the system.  A
possibility, perhaps, but Huw certainly knows electrical better then I do...so
I've copied him on this email.

HTH, or at least gets discussion going!

-Dave


---------------------------------------------------
89 90q  300km+ Rally Conversion...
Roll cage shots available at:
http://home.the-wire.com/~spokes/rollcage/page1.htm


Quoting duandcc_forums at cox.net:

> Interesting. My oil temp according to the digi gauge is running a bit high.
> At sustained highway speeds (75-80 MPH) it will creap up to as high as
> 140-145* C during summer with the AC on. One thing I did notice, and I think
> is attributable to bad grounds is that if I turn on the blower on high or
> press in the cigarette lighter, the temp rises an indicated 10-15* in 10
> seconds. obviously it is not really going up, just a false reading of some
> sort. But the slow creap up worries me. Even in windter it has a tendency to
> creap above 90* C (up to 110 or so). This is running 20w50 dino and an OEM
> filter in my NG... Thoughts?
>
> Dave
> 1987 CGT Special Build
> SE Virginia
> >