Re: 164LS Temp Readings/Fan

[Alan Lambert <gerard@domain.elided>]

Don't know about your fan, but the way to check operation is first to 
take off the temp switch ( drivers side of radiator, accessed behind a 
plastic cover next to headlight (in front)--then get a thermometer that 
reads to 212 (100C) and an ohm-meter heat up the water with the ohm-meter 
connected to both spade in the two terminal jack--should become 0 ohms at 
around 92C--then connect one ohm-meter wire to the single terminal 
jack--it should become a short at around 96 to 98 C--if the first short 
doesn't happen, then that's why the fan doesn't turn on at the low speed.

As an aside, I did the above, and found the thermo switch shorting at 
94C. When I put things back in the car, when the fan came on the 
temperature gauge was reading arounf 235F--so don't trust the gauge!


On Tue, 6 Jul 1999, Paul Begemann wrote:

> I know that this subject has been somewhat extensively dealt with, but
> with this beastly heat in New England, I seem to be having a problem, or
> maybe not.  First, what is a hot reading (obviously the temp light is
> not on) on the LS?  The temp. gauge is not really accurate to get a
> reading, and there is merely a white mark towards (but not all the way
> to) the 230 mark, which I interpret as around 215 or so.  Is a temp. in
> this range in slow traffic/at idle a problem?
> 
> Second, and the more important question, in the 100 degree heat, when I
> run the car at idle with the temp. gauge in this area, the radiator fan
> is not running at all!!   I know that there are two fan speeds, and once
> I noticed that as the gauge got a little higher the fast speed kicked
> in, but no slow speed.  Is this the problem with the resistors that I
> have read about here?  If so, how do I check it?  I also notice that if
> I engage the a/c, the fan still does not come on.  My past experience
> has been that if I put the a/c on, the fan also kicks on.
> 
> I want to be confident driving the car, and not worry about overheating
> in traffic, so please help.  Thanks.
> 
> 
> 

================================================================================
Regards,
Alan G. Lambert___________________________________<gerard@domain.elided>
           *******Los Altos, California (office)*******

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