Thermostat

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Old 11 Jan 2005, 03:38 pm   #1 (permalink)
RD
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Default Thermostat

When do you know when its time to change out the thermostat on a 98 Camry 4
cyl.?


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Old 11 Jan 2005, 07:46 pm   #2 (permalink)
hachiroku
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Default Re: Thermostat

On Tue, 11 Jan 2005 15:38:51 -0600, RD wrote:

> When do you know when its time to change out the thermostat on a 98 Camry 4
> cyl.?


When the temp guage starts acting weird. It may go high and stay there, it
may go high and then come back down, it may stay low, or it may fluctuate.
There is no set time to replace the thermostat; I have had one car go
255,000 miles before having to put in a new one. If you're the nervous
type, replace it when you replace the timing belt, or every other timing
belt change.
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Old 11 Jan 2005, 08:06 pm   #3 (permalink)
qslim
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Default Re: Thermostat

Change it when you change the water pump & tbelt

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Old 11 Jan 2005, 09:19 pm   #4 (permalink)
Horatio
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Default Re: Thermostat

RD wrote:
|| When do you know when its time to change out the thermostat on a 98
|| Camry 4 cyl.?

When it stops working.


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Old 11 Jan 2005, 10:49 pm   #5 (permalink)
jjjsan
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Default Re: Thermostat

When replacing water pump, coolant is drained from system.
Good insurance to replace, for the extra few dollars and alittle more
labor. Don't forget to check the major hoses.



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Old 11 Jan 2005, 11:01 pm   #6 (permalink)
Jason James
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Default Re: Thermostat


"RD" <dosvader2061NOSPAM@hotmail.com> wrote in message
news:cs1h1b$cuf$1@tribune.usask.ca...
> When do you know when its time to change out the thermostat on a 98 Camry

4
> cyl.?


The bulb type t/stats use the expansion of wax as it turns to liquid from
solid to force the valve open against the tension of a spring. If the wax
leaks out because of a broken bellow (which is part of the t/stat) the
return spring will cause the valve to shut, which inturn causes a near
instantaneous overheat.

I'd do it every 100,000ks or so.

Jason


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Old 12 Jan 2005, 12:17 am   #7 (permalink)
Viperkiller
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Default Re: Thermostat

On Tue, 11 Jan 2005 15:38:51 -0600, "RD"
<dosvader2061NOSPAM@hotmail.com> wrote:

>When do you know when its time to change out the thermostat on a 98 Camry 4
>cyl.?
>

As other replies have given you when it's suggested to change it, I'm
guessing that you're asking how one knows if the thermostat has
failed. Acting in that principle, I've found that factory Toyota
thermostats fail by staying open. This then results in a weak heater
during winter time as the car won't, or has a very hard time, reaching
operating temperature.

More simply put: if your temperature needle is lower in the winter
time than summer time, your thermostat is broken.
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Old 12 Jan 2005, 08:20 am   #8 (permalink)
RD
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Default Re: Thermostat

Thanks for all replies. Viperkiller nailed my dilemma though. I have no
history on summer vs. winter as I just bought the car. I am in a northern
climate though and it does seem to be slow to warm up and after it does I do
not get a lot of heat out. Of course it could also be cab heating coil or a
host of other things but thermostat failure would be easiest to fix, which
is why I was looking there first.

rd

"Viperkiller" <nothing@nunya.net> wrote in message
news:fvf9u0197r894mcvjuq2o09a6rpebk3rd3@4ax.com...
> On Tue, 11 Jan 2005 15:38:51 -0600, "RD"
> <dosvader2061NOSPAM@hotmail.com> wrote:
>
> >When do you know when its time to change out the thermostat on a 98 Camry

4
> >cyl.?
> >

> As other replies have given you when it's suggested to change it, I'm
> guessing that you're asking how one knows if the thermostat has
> failed. Acting in that principle, I've found that factory Toyota
> thermostats fail by staying open. This then results in a weak heater
> during winter time as the car won't, or has a very hard time, reaching
> operating temperature.
>
> More simply put: if your temperature needle is lower in the winter
> time than summer time, your thermostat is broken.



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Old 12 Jan 2005, 01:55 pm   #9 (permalink)
Jason James
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Default Re: Thermostat


"Viperkiller" <nothing@nunya.net> wrote in message
news:fvf9u0197r894mcvjuq2o09a6rpebk3rd3@4ax.com...
> On Tue, 11 Jan 2005 15:38:51 -0600, "RD"
> <dosvader2061NOSPAM@hotmail.com> wrote:
>
> >When do you know when its time to change out the thermostat on a 98 Camry

4
> >cyl.?
> >

> As other replies have given you when it's suggested to change it, I'm
> guessing that you're asking how one knows if the thermostat has
> failed. Acting in that principle, I've found that factory Toyota
> thermostats fail by staying open. This then results in a weak heater
> during winter time as the car won't, or has a very hard time, reaching
> operating temperature.
>
> More simply put: if your temperature needle is lower in the winter
> time than summer time, your thermostat is broken.


I haven't seen a Totyota thermostat and find it interesting they stay open
when failed. They must use another principle than the 'wax-pellet' design ?

Jason


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Old 12 Jan 2005, 05:56 pm   #10 (permalink)
Philip
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Default Re: Thermostat

Jason James wrote:
> I haven't seen a Totyota thermostat and find it interesting they stay
> open when failed. They must use another principle than the
> 'wax-pellet' design ?
>
> Jason



http://www.autosite.com/garage/repairqa/ques018.asp
"THERMOSTAT FAILURE

The thermostat is pretty simple and rarely causes problems, but when it
fails the results can be disastrous. The worst case scenario is when the
thermostat sticks shut, which can happen if the wax element has been damaged
by previous overheating, corrosion or age. If it sticks shut, it will block
the circulation of coolant between the engine and radiator causing the
engine to overheat.

If the thermostat fails to *close*, which can happen if the sensing element
binds up, the return spring breaks or a piece of rust or debris jams it
open, the constant flow of coolant through the thermostat will prevent the
engine from reaching normal operating temperature. This can cause poor
driveability in cold weather, a sharp increase in fuel consumption, little
or no heater output, and accelerated blowby and ring and cylinder wear. "


--

~Philip.




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