98 Toyota Camry Overheating

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Old 08 Apr 2009, 12:03 am   #1 (permalink)
bsmith95610
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Default 98 Toyota Camry Overheating

I have a 98 Toyota Camry that's temperature gage says it's
overheating. When I put the heater on the temperature stays the
same. When I put the air conditioning on the temperature gage goes
back down. It doesn't overheat every time I drive it but does most
of
the time. I have never fully overheated the temperature gage will
just get really high and I have to turn the AC on or stop driving for
a few minutes. I have replaced the thermostat, radiator, water pump,
and temperature sensor. Could it possibly be something to do with
the
fans that are mounted on the radiator? These were not replaced I
took
them off of the old radiator and installed them on the new one. It
appears that the fans are not running when the car is running but
when
I turn on the AC they start up. Is it possible that it is something
with the fans? Any help would be much appreciated.
Thanks,
Brant
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Old 08 Apr 2009, 12:19 am   #2 (permalink)
johngdole@hotmail.com
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Default Re: 98 Toyota Camry Overheating

Turning on AC forces the AC fan to come on. I would first check your
radiator fan (not the AC fan, which sounds like is working).

Both fans should run when you turn on the AC. So let us know if one
isn't.


On Apr 7, 10:03*pm, bsmith95610 <bsmith95...@gmail.com> wrote:
> I have a 98 Toyota Camry that's temperature gage says it's
> overheating. *When I put the heater on the temperature stays the
> same. *When I put the air conditioning on the temperature gage goes
> back down. *It doesn't overheat every time I drive it but does most
> of
> the time. *I have never fully overheated the temperature gage will
> just get really high and I have to turn the AC on or stop driving for
> a few minutes. *I have replaced the thermostat, radiator, water pump,
> and temperature sensor. *Could it possibly be something to do with
> the
> fans that are mounted on the radiator? *These were not replaced I
> took
> them off of the old radiator and installed them on the new one. *It
> appears that the fans are not running when the car is running but
> when
> I turn on the AC they start up. *Is it possible that it is something
> with the fans? *Any help would be much appreciated.
> Thanks,
> Brant


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Old 08 Apr 2009, 08:01 am   #3 (permalink)
ransley
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Default Re: 98 Toyota Camry Overheating

On Apr 8, 12:03*am, bsmith95610 <bsmith95...@gmail.com> wrote:
> I have a 98 Toyota Camry that's temperature gage says it's
> overheating. *When I put the heater on the temperature stays the
> same. *When I put the air conditioning on the temperature gage goes
> back down. *It doesn't overheat every time I drive it but does most
> of
> the time. *I have never fully overheated the temperature gage will
> just get really high and I have to turn the AC on or stop driving for
> a few minutes. *I have replaced the thermostat, radiator, water pump,
> and temperature sensor. *Could it possibly be something to do with
> the
> fans that are mounted on the radiator? *These were not replaced I
> took
> them off of the old radiator and installed them on the new one. *It
> appears that the fans are not running when the car is running but
> when
> I turn on the AC they start up. *Is it possible that it is something
> with the fans? *Any help would be much appreciated.
> Thanks,
> Brant


Do both fans come on with AC on, You dont want to run cars hot, run
near the boiling point and only antifreeze is saving your ass from
boiling and to much pressure. Fans have to kick on at a certain temp
and if they run wilth the ac on and it cools the motor run the AC when
temps rise till you fix it, and leave heat setting to hot. Maybe its
the temp sending unit on the motor. Where are you, where I am its 45f
for a high and my fans will rarely run, is expansion tank full, is
antifreeze no more than 50-50 mix. Id say keep heat on hot and high
and run the ac till you fix it, it doesnt take long for higher
pressures you likely have running hotter to ruin a head gasket. On
mine both fans run with AC, if only one runs it could be several
issues. Running hot also ruins oil, fix it before alot of bad stuff
happens, sludge and a blown head gasket.
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Old 08 Apr 2009, 10:30 am   #4 (permalink)
bsmith95610
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Default Re: 98 Toyota Camry Overheating

Just so I am clear. Is one fan supposed to run pretty much all of the
time then when I turn on the AC that should turn the other fan on? Or
is the first fan only supposed to turn on when the engine is starting
to get hotter?
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Old 08 Apr 2009, 02:54 pm   #5 (permalink)
ransley
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Default Re: 98 Toyota Camry Overheating

On Apr 8, 10:30*am, bsmith95610 <bsmith95...@gmail.com> wrote:
> Just so I am clear. *Is one fan supposed to run pretty much all of the
> time then when I turn on the AC that should turn the other fan on? *Or
> is the first fan only supposed to turn on when the engine is starting
> to get hotter?


Im not positive, but I think both run with a hot motor and AC or even
just AC. jump power to the fan that doesnt run to see if it works.
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Old 08 Apr 2009, 06:09 pm   #6 (permalink)
Leftie
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Default Re: 98 Toyota Camry Overheating

bsmith95610 wrote:
> I have a 98 Toyota Camry that's temperature gage says it's
> overheating. When I put the heater on the temperature stays the
> same. When I put the air conditioning on the temperature gage goes
> back down. It doesn't overheat every time I drive it but does most
> of
> the time. I have never fully overheated the temperature gage will
> just get really high and I have to turn the AC on or stop driving for
> a few minutes. I have replaced the thermostat, radiator, water pump,
> and temperature sensor. Could it possibly be something to do with
> the
> fans that are mounted on the radiator? These were not replaced I
> took
> them off of the old radiator and installed them on the new one. It
> appears that the fans are not running when the car is running but
> when
> I turn on the AC they start up. Is it possible that it is something
> with the fans? Any help would be much appreciated.
> Thanks,
> Brant



The two most likely possibilities are a gauge that isn't reading
correctly, and just gets affected by change in current when you switch
on the A/C, or it's those fans running only with the A/C - you may have
bad temp switches (switch?) for the fans. Still, those fans shouldn't be
needed at all on the highway...
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Old 09 Apr 2009, 02:14 am   #7 (permalink)
johngdole@hotmail.com
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Default Re: 98 Toyota Camry Overheating

In general, the "radiator fan" runs when the engine coolant
temperature switch (ECT) got to a certain threshold, say about 200
degF. There are other sensors that begin with "engine coolant
temperature", but this "switch" basically switches on/off the radiator
fan if the coolant is above the threshold. (See Autozone.com free
repair guide for details, I think now you have to set up a free
account too).

When you turn on the AC, both fans should run at slow speeds. (by 1998
I think all are). When the condenser got too warm from dumping all the
heat, then both fans will run at high speeds.

So sounds like your radiator fan is not working. As to why it's not
working you have to verify: fuses, ECT switch (you may have two), and
fan motor (easy, by jumpering 12V if you're electrically inclined).
Good luck.


On Apr 8, 8:30*am, bsmith95610 <bsmith95...@gmail.com> wrote:
> Just so I am clear. *Is one fan supposed to run pretty much all of the
> time then when I turn on the AC that should turn the other fan on? *Or
> is the first fan only supposed to turn on when the engine is starting
> to get hotter?


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Old 09 Apr 2009, 06:42 am   #8 (permalink)
ransley
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Default Re: 98 Toyota Camry Overheating

On Apr 9, 2:14*am, johngd...@hotmail.com wrote:
> In general, the "radiator fan" runs when the engine coolant
> temperature switch (ECT) got to a certain threshold, say about 200
> degF. There are other sensors that begin with "engine coolant
> temperature", but this "switch" basically switches on/off the radiator
> fan if the coolant is above the threshold. (See Autozone.com free
> repair guide for details, I think now you have to set up a free
> account too).
>
> When you turn on the AC, both fans should run at slow speeds. (by 1998
> I think all are). When the condenser got too warm from dumping all the
> heat, then both fans will run at high speeds.
>
> So sounds like your radiator fan is not working. As to why it's not
> working you have to verify: fuses, ECT switch (you may have two), and
> fan motor (easy, by jumpering 12V if you're electrically inclined).
> Good luck.
>
> On Apr 8, 8:30*am, bsmith95610 <bsmith95...@gmail.com> wrote:
>
>
>
> > Just so I am clear. *Is one fan supposed to run pretty much all of the
> > time then when I turn on the AC that should turn the other fan on? *Or
> > is the first fan only supposed to turn on when the engine is starting
> > to get hotter?- Hide quoted text -

>
> - Show quoted text -


Yes it could be a fuse or maybe relay? My relays can be reset.
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