[s-cars] Re: Heater Control Temp vs Temp Gauge
jhlk99 at yahoo.com
Fri Dec 13 12:52:20 EST 2002
--- Bob Rossato <bob.rossato at att.net> wrote: > > What
I observed yesterday was that the climate
> > controller reported the coolant temperature to be
> > after a restart (the car had been driven a short
> > distance and also idled while the coolant was
> > up) about 15 minutes after I completed the
> > change. It stayed at 50C for a couple of miles
> > proceeding towards 87C.
> That appears to be normal. Mine did the same thing
> (holding at 50C). What
> was odd was that I decided to check it first thing
> in the morning with
> ignition on but engine not running and the
> temperature would continually
> increase. When I accessed channel 51 it was around
> 10C and I watched it
> increase to 37C with the engine still off before I
> went ahead and started it
> up. At that point it continued at the same rate and
> then held at 50C.
> While it was rising with the engine off the fan
> would react to different
> temp points. The only thing I can figure is that
> the sensor has a
> pre-heater built in like the O2 sensor and it stops
> at 50C. Why I don't
> know and haven't checked it see how many wires are
> going to it. Just
> another of those funky things.
Hmmm, that would be why the climate controller always
displays a temperature higher than ambient whenever I
start the car in the evening after work.
The increase is probably due to resistive heating. The
sensor is a resistor and it is read by applying a
voltage across it. That would start heating it up.
Do You Yahoo!?
Everything you'll ever need on one web page
from News and Sport to Email and Music Charts
More information about the S-car-list