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Old 11-24-2005, 21:01   #1 (permalink)
VJC
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Temp Guage Fluctuation - 98 Explorer

When I start my 98 and allow it to come to running temp (~1/3 full
scale on temp guage), when i turn my heater fan on with temp set to hot
the temp guage drops to "C". Any suggestions as what the problem might
be? My first guess is the coolant temp sensor.

Thanks, VJC

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Old 11-24-2005, 22:01   #2 (permalink)
Jim Warman
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Re: Temp Guage Fluctuation - 98 Explorer

You'll have to pardon me if I get a bit "like that"... It's ben one of
"those days" in a week full of "those days" that is actually been a month
full of "those weeks"... all with no let up in sight....

I am going to assume that coolant level and condition has been checked....I
can't recall if the 98 has a degas bottle system or a closed rad with
reservoir system.... If it is the latter, the fluid level in the rad will
need to be checked. I don't know where you live (like climate ever
mattered, right?), so coolant condition and strength is important.

Your engine temp guage fluctuations are an effect of whatever the concern
may be.... Faulty senders don't, as a rule, "cycle". Bad is bad and that is
that.

Low coolant level IS cyclic... depending on where the air gets pushed. Bad
thermostats can be (but not always) cyclic.

Word to the wise... whenever a warning device is telling us something is
bad.... believe the warming device first. To assume that the warning device
is bad and to continue to operate the vehicle only sets us up to spend more
money than we needed to.

"VJC" <vincentcapponi@yahoo.com> wrote in message
news:1132892863.578441.47270@f14g2000cwb.googlegroups.com...
> When I start my 98 and allow it to come to running temp (~1/3 full
> scale on temp guage), when i turn my heater fan on with temp set to hot
> the temp guage drops to "C". Any suggestions as what the problem might
> be? My first guess is the coolant temp sensor.
>
> Thanks, VJC
>



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Old 11-26-2005, 11:01   #3 (permalink)
VJC
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Re: Temp Guage Fluctuation - 98 Explorer

Jim,

Thanks so much for the input. Checked radiator coolant level (open
system) and it is full. Coolant resivoir tank is low, right at fill
line so I do need to add more coolant. The weather here in East Coast
has been in 20's, no too cold (I lived in MN for 4 yrs so this nearly
spring weather). At this point the better part of valor may be to take
it in, I do not work on cars much,. I thought possibly the symptom I
described was a sensor issue but as you said when sensors fail they
usually fail not intermittent or cyclic.

Thanks again for the input.

VJC

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Old 11-26-2005, 13:01   #4 (permalink)
Jim Warman
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Re: Temp Guage Fluctuation - 98 Explorer

One thing I did forget to mention was the thermostat... for some reason, the
4.0 (especially the cam in block or OHV design) seems to be hard on
thermostats. Relatively easy for most DIYers. A 10mm swivel socket helps
ease the pain and, since the bolts are small, a little care must be taken to
avoid twisting them off.

While a normally functioning thermostat will "seek" a midpoint, faulty
thermostats can fluctuate giving the guage a fluctuation.

HTH

"VJC" <vincentcapponi@yahoo.com> wrote in message
news:1133029280.431448.184540@g47g2000cwa.googlegroups.com...
> Jim,
>
> Thanks so much for the input. Checked radiator coolant level (open
> system) and it is full. Coolant resivoir tank is low, right at fill
> line so I do need to add more coolant. The weather here in East Coast
> has been in 20's, no too cold (I lived in MN for 4 yrs so this nearly
> spring weather). At this point the better part of valor may be to take
> it in, I do not work on cars much,. I thought possibly the symptom I
> described was a sensor issue but as you said when sensors fail they
> usually fail not intermittent or cyclic.
>
> Thanks again for the input.
>
> VJC
>



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Old 11-26-2005, 23:01   #5 (permalink)
Just_Steve
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Re: Temp Guage Fluctuation - 98 Explorer

I agree with Jim. My '96 OHV was notorious for needing a new thermostat
every couple of years. After using the OEMs for years, I finally replaced
it with a Stant "SuperStat". According to Stant, "...SuperStats are
manufactured with a patented v-notch, non-linear valve design which reduces
cycling, brings your car to the proper operating temperature more
quickly,improves engine efficiency and fuel economy and prolongs engine
life." I can attest that it does keep a more even temperature than the OEMs
ever did (temp gauge usually goes to it's normal range and doesn't move much
after that), but can't really confirm that it warms up any faster or not.
Have had this one in going on 4 years now, and it still seems to be working
fine, which is longer than any of my previous ones lasted.

Steve


"Jim Warman" <mechanic@tenalpsulet.net> wrote in message
news:Ip2if.175444$Io.92693@clgrps13...
> One thing I did forget to mention was the thermostat... for some reason,

the
> 4.0 (especially the cam in block or OHV design) seems to be hard on
> thermostats. Relatively easy for most DIYers. A 10mm swivel socket helps
> ease the pain and, since the bolts are small, a little care must be taken

to
> avoid twisting them off.
>
> While a normally functioning thermostat will "seek" a midpoint, faulty
> thermostats can fluctuate giving the guage a fluctuation.
>
> HTH
>
> "VJC" <vincentcapponi@yahoo.com> wrote in message
> news:1133029280.431448.184540@g47g2000cwa.googlegroups.com...
> > Jim,
> >
> > Thanks so much for the input. Checked radiator coolant level (open
> > system) and it is full. Coolant resivoir tank is low, right at fill
> > line so I do need to add more coolant. The weather here in East Coast
> > has been in 20's, no too cold (I lived in MN for 4 yrs so this nearly
> > spring weather). At this point the better part of valor may be to take
> > it in, I do not work on cars much,. I thought possibly the symptom I
> > described was a sensor issue but as you said when sensors fail they
> > usually fail not intermittent or cyclic.
> >
> > Thanks again for the input.
> >
> > VJC
> >

>
>



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Old 11-27-2005, 09:01   #6 (permalink)
carbide@egine.com
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Re: Temp Guage Fluctuation - 98 Explorer


Just_Steve wrote:
> I agree with Jim. My '96 OHV was notorious for needing a new thermostat
> every couple of years. After using the OEMs for years, I finally replaced
> it with a Stant "SuperStat". According to Stant, "...SuperStats are
> manufactured with a patented v-notch, non-linear valve design which reduces
> cycling, brings your car to the proper operating temperature more
> quickly,improves engine efficiency and fuel economy and prolongs engine
> life."


I tried to buy one when I recently replaced my thermostat, but couldn't
find one. I even tried a local outlet that advertised them on their
national website. I finally gave up and put in what I was offered. It
works great, so I'm happy.
-Paul

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