temperature gauge

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Old 13 Jan 2009, 07:43 pm   #1 (permalink)
badgolferman
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Default temperature gauge

My 1997 4-cylinder Camry's temperature doesn't reach the middle of the
gauge anymore. Should I assume the thermostat needs to be replaced?
If so how difficult is that procedure?
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Old 13 Jan 2009, 10:15 pm   #2 (permalink)
johngdole@hotmail.com
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Default Re: temperature gauge

Look on Autozone's free repair guide and see if you can find
diagnostic procedures for temperature gauge, gauge sender (one wire).

If you put an ohmmeter on the ECT sensor (2 wires) at operating temp,
it should be close to 100 ohms or something like that (resistance high
like 1 Kohm when cool for instance). Check Autozone's free loaner tool
program near you to see if they have these tools for you
..
You need to verify that the engine is indeed running cool before
starting to change the thermostat or gauge or sender, etc.



On Jan 13, 5:43*pm, "badgolferman" <REMOVETHISbadgolfer...@gmail.com>
wrote:
> My 1997 4-cylinder Camry's temperature doesn't reach the middle of the
> gauge anymore. *Should I assume the thermostat needs to be replaced?
> If so how difficult is that procedure?


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Old 13 Jan 2009, 11:50 pm   #3 (permalink)
Ray O
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Default Re: temperature gauge


"badgolferman" <REMOVETHISbadgolferman@gmail.com> wrote in message
news:xn0g54kfk5z3nqz003@news.albasani.net...
> My 1997 4-cylinder Camry's temperature doesn't reach the middle of the
> gauge anymore. Should I assume the thermostat needs to be replaced?
> If so how difficult is that procedure?


As johngdole suggested, check the coolant temperature sender with a
multi-meter before you start taking stuff apart. There should also be a
procedure at autozone's web site for checking the thermostat.

That said, if the thermostat is original, it is more likely to be bad than
the sender or the gauge. if you decide to replace

When the temp gauge reaches its peak, check to make sure that the electric
cooling fans behind the radiator are not running.

Replacing the thermostat is not that difficult, although it is time
consuming. You'll need a pair of pliers to open the drain petcock at the
bottom of the radiator, wrenches to remove the bolts that hold the
thermostat housing in place (my guess is 12 mm), a gasket scraper, fresh
coolant (Toyota red Long Life is the preferred if that is what you have been
using all along), and a bucket to drain the old coolant into. Basically,
you drain the old coolant through the drain petcock at the bottom of the
radiator, close the petcock, remove the 2 bolts on the thermostat housing,
remove the old thermostat, paying close attention to the orientation of the
spring and jiggler valve, scrape off the old gasket from the block and
thermostat housing, install the new gasket and thermostat the same way the
old one came out, re-install the housing, and fill the radiator. Start the
engine and let it idle and warm up, set the heater temp control to full hot,
and wait for the coolant level in the radiator to drop, gradually topping
off until the level doesn't drop any more. Fill the overflow reservoir to
the max hot level, replace the radiator cap, and top off the overflow bottle
if the level drops some more.
--

Ray O
(correct punctuation to reply)


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Old 14 Jan 2009, 08:20 am   #4 (permalink)
ransley
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Default Re: temperature gauge

On Jan 13, 7:43*pm, "badgolferman" <REMOVETHISbadgolfer...@gmail.com>
wrote:
> My 1997 4-cylinder Camry's temperature doesn't reach the middle of the
> gauge anymore. *Should I assume the thermostat needs to be replaced?
> If so how difficult is that procedure?


A bad thermostat will take longer to warm up the motor, in the city it
may never warm up in winter but on the highway it will, the heat wont
feel hot. The gauge can also go up and down with a good stat it realy
should not move once its warmed up, does your car have these issues.
Is it much lower on the gauge. If you do it flush the cooling system,
its time.
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