97 Camry 4-Cylinder Overheating

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Old 07 Sep 2006, 02:24 pm   #1 (permalink)
jay
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Default 97 Camry 4-Cylinder Overheating

Previously the 2 electric cooling fans were not turning on even when
the engine was hot. Currently, I have the 2 fans on all the time (by
unplugging two connectors near radiator). Now, overheating only occurs
on hot days when climing hills and is proportional to speed. It is OK
even on hills, if I slow down to 55 mph and have the heater on full
blast. It seems to me that the hot water is not circulating through the
radiator. What is the most likely cause for this? Thx.

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Old 07 Sep 2006, 02:29 pm   #2 (permalink)
Mark
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Default Re: 97 Camry 4-Cylinder Overheating

It's almost 10 years old, radiators tend to get plugged up after a
while. They are not hard to change, and rebuilt ones are not very
expensive.


jay wrote:
> Previously the 2 electric cooling fans were not turning on even when
> the engine was hot. Currently, I have the 2 fans on all the time (by
> unplugging two connectors near radiator). Now, overheating only occurs
> on hot days when climing hills and is proportional to speed. It is OK
> even on hills, if I slow down to 55 mph and have the heater on full
> blast. It seems to me that the hot water is not circulating through the
> radiator. What is the most likely cause for this? Thx.


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Old 07 Sep 2006, 02:31 pm   #3 (permalink)
jay
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Default Re: 97 Camry 4-Cylinder Overheating

> Previously the 2 electric cooling fans were not turning on even when
> the engine was hot. Currently, I have the 2 fans on all the time (by
> unplugging two connectors near radiator). Now, overheating only occurs
> on hot days when climing hills and is proportional to speed. It is OK
> even on hills, if I slow down to 55 mph and have the heater on full
> blast. It seems to me that the hot water is not circulating through the
> radiator. What is the most likely cause for this? Thx.


Forgot to say, the radiator is always full and oveflow resevoir is
always at a level between low and high lines. It doesn't seem to
consuming or venting any coolant.

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Old 07 Sep 2006, 02:34 pm   #4 (permalink)
mack
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Default Re: 97 Camry 4-Cylinder Overheating


"Mark" <bogusmailmark@yahoo.com> wrote in message
news:1157657353.051130.24370@m73g2000cwd.googlegro ups.com...
> It's almost 10 years old, radiators tend to get plugged up after a
> while. They are not hard to change, and rebuilt ones are not very
> expensive.
>

Before getting to the radiator, I'd check the thermostat, and possibly one
of the radiator hoses is (if it's the original) is collapsing, sucking the
hose flat and not allowing the circulation of coolant. and how old is
your coolant?


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Old 07 Sep 2006, 02:35 pm   #5 (permalink)
jay
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Default Re: 97 Camry 4-Cylinder Overheating

> It's almost 10 years old, radiators tend to get plugged up after a
> while. They are not hard to change, and rebuilt ones are not very
> expensive.


Thanks. Is there a valve of some sort which controls flow of coolant
through radiator? If so how could I check it prior to replacing
radiator?

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Old 07 Sep 2006, 02:49 pm   #6 (permalink)
Nobody Important
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Default Re: 97 Camry 4-Cylinder Overheating

jay wrote:
> Thanks. Is there a valve of some sort which controls flow of coolant
> through radiator? If so how could I check it prior to replacing
> radiator?


Yes, there's a valve where the (upper, I think) radiator hose enters the
engine. To test it, you put it in some water and heat it up _gradually_
(i.e. don't dump it into already-hot water) and note how the length
changes. See the manual at http://oregonstate.edu/~tongt/camry/ for
the exact procedure.

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Old 07 Sep 2006, 06:47 pm   #7 (permalink)
m Ransley
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Default Re: 97 Camry 4-Cylinder Overheating

I would flush the system and replace the thermostat, use a Toy, ive had
several defective aftermarket ones, one where the gasket never sealed.
You can see if your radiator has scale built up, lower the water level a
bit. Maybe your hoses are bad also.

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Old 08 Sep 2006, 08:36 am   #8 (permalink)
Jason James
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Default Re: 97 Camry 4-Cylinder Overheating


"jay" <jaym1212@hotmail.com> wrote in message
news:1157657053.498125.60240@h48g2000cwc.googlegro ups.com...
> Previously the 2 electric cooling fans were not turning on even when
> the engine was hot. Currently, I have the 2 fans on all the time (by
> unplugging two connectors near radiator). Now, overheating only occurs
> on hot days when climing hills and is proportional to speed. It is OK
> even on hills, if I slow down to 55 mph and have the heater on full
> blast. It seems to me that the hot water is not circulating through the
> radiator. What is the most likely cause for this? Thx.


If I understand you, you're saying the engine needs both fans on all the
time to ward-off overheating, and the use of the small amount of extra
cooling by using the heater, also improves things. Because your car is not
losing coolant, it points to inadequate radiator performance and/or the
thermostat is opening too late.

If the coolant is either ordinary water or has never been changed, its also
a chance the radiator may have rust and gunk blocking some of its cooling
tubes,...but as I mentioned, as well, the t/stat needs replacing anyway, as
they aren't too expensive. Use a genuine Toyota thermostat.

For good maintenance, you should replace any old hoses, otherwise, any work
you do can be negated by a blown hose further down the road (so to speak).

Jason
>



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Old 08 Sep 2006, 01:05 pm   #9 (permalink)
m Ransley
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Default Re: 97 Camry 4-Cylinder Overheating

Are you using 50% antifreeze, 100% antifreeze and it can overheat.

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Old 09 Sep 2006, 11:16 pm   #10 (permalink)
jay
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Default Re: 97 Camry 4-Cylinder Overheating

> > Previously the 2 electric cooling fans were not turning on even when
> > the engine was hot. Currently, I have the 2 fans on all the time (by
> > unplugging two connectors near radiator). Now, overheating only occurs
> > on hot days when climing hills and is proportional to speed. It is OK
> > even on hills, if I slow down to 55 mph and have the heater on full
> > blast. It seems to me that the hot water is not circulating through the
> > radiator. What is the most likely cause for this? Thx.

>
> If I understand you, you're saying the engine needs both fans on all the
> time to ward-off overheating, and the use of the small amount of extra
> cooling by using the heater, also improves things. Because your car is not
> losing coolant, it points to inadequate radiator performance and/or the
> thermostat is opening too late.
>
> If the coolant is either ordinary water or has never been changed, its also
> a chance the radiator may have rust and gunk blocking some of its cooling
> tubes,...but as I mentioned, as well, the t/stat needs replacing anyway, as
> they aren't too expensive. Use a genuine Toyota thermostat.
>
> For good maintenance, you should replace any old hoses, otherwise, any work
> you do can be negated by a blown hose further down the road (so to speak).


I believe you are on the right track. Today, Goodyear replaced the
thermostat, temperature sensor (with OEM part), temperature switch,
upper and lower hoses, flushed/refilled the coolant. Although the fans
are now turning on, the car still exhibits the same problem. At the end
of the day, the technician said I may yet need to replace the radiator,
pump or possibly the head gasket (in that order). He did say that the
coolant looked quite brown in color. Is there a standard way for a
technician to determine if the radiator is corroded or obstructed?

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