Losing coolant from radiator but overflow tank is full

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Old 06 Mar 2006, 10:33 am   #1 (permalink)
eagle72
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Default Losing coolant from radiator but overflow tank is full

I have '95 Camry and for some reason it losing collant from radiator
that cuse the car to over heat. I have been tried to fixed it for
almost a month but still stuck.

At first I saw soem water underneath the car and the overflow tank was
really low. I changed the overflow tank and the leak has totally gone.
But I still have problem with low collant in the radiator.

It seem the problem that the collant goes to the overflow tank without
any problem when the engine start to get hotter. But it never goes back
to the radiator when the encine cools down.

Anybody had similar experience or know how to fix this ?
Anny help will be appreciated.

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Old 06 Mar 2006, 11:22 am   #2 (permalink)
Daniel
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Default Re: Losing coolant from radiator but overflow tank is full

Try checking the radiator carefully.
The upper plastic tank can develop a tiny breaks that allow coolant to
leak, but if they're small enough, or hidden, you may not see them
without searching for a while with a light. Try looking with the engine
cold. That's how I found mine. Was checking something else under the
hood and spotted a small amount of fluid on the upper tank.
Supposedly, the new radiators include an improved reinforced design.
Changed mine a while back, no problems since.
If you want to go an extra step, there are cushions under the upper
clamps that can be replaced.
Save the rubber "doughnuts" from the bottom for re use.
Be really vigilant about over heating - it can create severe engine
trouble with your aluminum heads.
The Toyota radiator is aluminum, and when working properly, with the
correct coolant, they function extremely well, dissipating heat rapidly
over a large surface area to minimize usage of the electric fans.

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Old 06 Mar 2006, 04:27 pm   #3 (permalink)
davidj92
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Default Re: Losing coolant from radiator but overflow tank is full

eagle72 wrote:
> I have '95 Camry and for some reason it losing collant from radiator
> that cuse the car to over heat. I have been tried to fixed it for
> almost a month but still stuck.
>
> At first I saw soem water underneath the car and the overflow tank was
> really low. I changed the overflow tank and the leak has totally gone.
> But I still have problem with low collant in the radiator.
>
> It seem the problem that the collant goes to the overflow tank without
> any problem when the engine start to get hotter. But it never goes
> back to the radiator when the encine cools down.
>
> Anybody had similar experience or know how to fix this ?
> Anny help will be appreciated.


I think your radiator cap is bad. It's a two-way valve and it seems it's
only working one-way. Should be a cheap fix, I recommend an OEM cap from
your local dealer.
HTH, davidj92


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Old 30 Mar 2006, 04:44 am   #4 (permalink)
justinm930
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Default Re: Losing coolant from radiator but overflow tank is full

the cap idea sounds right. I had the same problem in my 91 camry. I saw
coolant in tiny amounts accumalating on the shield under the rad, over
flow was full. I thought it was the hoses so I replaced them, but
eventually realized it was the rad cap. Just be careful not to select a
rad cap that is under/over the original rated pressure. Go with OEM
equipment whenever possible Remember: always consider the smaller repairs
first when troubleshooting it will save you alot of time, agravation, and
money!

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Old 30 Mar 2006, 09:42 pm   #5 (permalink)
Madison18
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Default Re: Losing coolant from radiator but overflow tank is full

I can explain your problem, but do not know where the problem (the
leak) is. Your cooling system is low on coolant. This may cause the
thermostat not being immersed in coolant. Therefore, even when the
engine overheats and the coolant is hot in the engine, the thermostat
is cool and refuses to open. You can check this condition by touching
the lower radiator hose and find that it is cool even when the car
overheats.

Madison18

eagle72 wrote:
> I have '95 Camry and for some reason it losing collant from radiator
> that cuse the car to over heat. I have been tried to fixed it for
> almost a month but still stuck.
>
> At first I saw soem water underneath the car and the overflow tank was
> really low. I changed the overflow tank and the leak has totally gone.
> But I still have problem with low collant in the radiator.
>
> It seem the problem that the collant goes to the overflow tank without
> any problem when the engine start to get hotter. But it never goes back
> to the radiator when the encine cools down.
>
> Anybody had similar experience or know how to fix this ?
> Anny help will be appreciated.


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Old 30 Mar 2006, 09:42 pm   #6 (permalink)
Madison18
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  • Posts: n/a
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Default Re: Losing coolant from radiator but overflow tank is full

I can explain your problem, but do not know where the problem (the
leak) is. Your cooling system is low on coolant. This may cause the
thermostat not being immersed in coolant. Therefore, even when the
engine overheats and the coolant is hot in the engine, the thermostat
is cool and refuses to open. You can check this condition by touching
the lower radiator hose and find that it is cool even when the car
overheats.

Madison18

eagle72 wrote:
> I have '95 Camry and for some reason it losing collant from radiator
> that cuse the car to over heat. I have been tried to fixed it for
> almost a month but still stuck.
>
> At first I saw soem water underneath the car and the overflow tank was
> really low. I changed the overflow tank and the leak has totally gone.
> But I still have problem with low collant in the radiator.
>
> It seem the problem that the collant goes to the overflow tank without
> any problem when the engine start to get hotter. But it never goes back
> to the radiator when the encine cools down.
>
> Anybody had similar experience or know how to fix this ?
> Anny help will be appreciated.


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