Operating temp Question

[Kevin Grover]

Most of the gauges in the newer cars aren't linear.  I recall reading an
article about the corvette in particular where a customer complained that it
was overheating because the gauge got into the upper range.  The scan tool
said that the temp was only like 200 where the gauge was closer to 260.
They move faster in the middle.  That mark might really be 200 or 205.
----- Original Message -----
From: "Bob Wooten" <r71chevy at earthlink.net>
To: <diy_efi at diy-efi.org>
Sent: Thursday, December 13, 2001 10:53 PM
Subject: Operating temp Question


> I have a 98 Grand Prix, 3.8L NA motor.  I was noticing that it appears to
> run cold.  how hot is it supposed to run?
>
> the gauge looks like this.  the "--->" is where the temp sits most of the
> time.
>
> 260 ------
>        ---
>        ---
>        ---
>        ---
>        ---
>      -----
>        ---
>        ---
>        ---
>        ---
>        ---
> 210  -----
>        ---
>        ---
>        ---
>        ---
>        ---
> -->  -----
>        ---
>        ---
>        ---
>        ---
>        ---
> 160  -----
>
>
> If I take (210-160)/2 + 160 this indicates that the motor is running @
185.
> this seems to be pretty darn cold considering that this is a 98 model car.
> my 71 came with a 185 stat, I would think that this car would tend to want
> to run warmer, maybe 210 or so where the middle of the gauge is.
> unfortunately I don't have a scanner for the car, so I don't know what the
> ECM thinks the temp is, but it seems to be quite happy.
>
> it also appears that that the ECM controls the voltage to the cooling
fans.
> when it gets up @ just above this 185 point both of the fans come on, but
> they only draw a small amount of air.  I cant imagine that this is all
these
> fans can pull, so I am guessing that it has a DAC or something that it
> outputs to the fans to control how much air they pull. am I way off base
or
> what?
>
> Boy, these new fangled cars gots all kind O stuff in dem.
>
> Bob Wooten
> r71chevy at earthlink.net
> www.r71camaro.homestead.com
>
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