Coolant temperature sensor question.

[Richard J Lebens]

Doesn't NTC stand for Negative Temperature Coefficient?  When the
temperature goes down the resistance goes up?



--- Huw Powell <audi at mediaone.net> wrote:
> 
> > I'm still diagnosing a cold running problem in my 87 4KCSQ. I
> checked the
> > resistance on the NTC Coolant Temp sensor (the bottom one on the
> upper rad
> > hose flange) and came up with about 8.7K ohms at @ 40 deg F.
> Bentley says
> > 2.5K ohms @ 68 deg. F.
> > 
> > Is 8.7K ohms too high for 40 deg F? The Bentley only says
> resistance "is
> > higher above 68F" or something similarly vague......
> 
> sound like you need a new one.  since the resistance is supposed to
> rise
> with temperature (or is it?  that wouldn't be NTC it would be PTC)
> then
> yours being higher at lower temp would be bad.  Might want to read
> that
> spec again to be sure!  I thought there was a resistance spec for a
> lower temperature, too.  substituting a known value fixed resistor
> set
> to the "cold" spec can be a quickie way of checking if that is where
> the
> problem lies too.
> 
> -- 
> Huw Powell
> 
> http://www.humanspeakers.com
> 
> http://www.humanthoughts.org


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