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Fluids and Lubricants Motor oil, transmission oil, radiator fluid, power steering fluid, blinker fluid... wait, there is no blinker fluid. Technical discussion and analysis of the different lubricants we use in our cars.

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Old 07-10-2006, 09:59 PM   #1
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is it bad to over fill the coolant reservouir tank?

just as the title says...is it bad to over flow it? I guess I couldn't see the min and max lines very well...and kinda went overboard...what exactly is the purpose of this tank? it looks like it relieves excess pressure from the cooling system or something? cuz when the engine is all warmed up, the tank becomes more filled up with water
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Old 07-11-2006, 03:55 AM   #2
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The only thing that overfilling opens you up to is the tank overflowing when the system is real hot. Since the coolant resevour(sp?) has an overflow tube on it, the worst that happens is it dumps coolant on the ground. Just be careful if you have pets b/c coolant tastes good to them, though it will kill them. Other than that, it won't be a problem for the car.
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Old 07-11-2006, 04:30 AM   #3
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Bingo, the hot liquid expands with heat, so it need the extra space for when it gets extreamly hot.
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Old 07-13-2006, 06:47 PM   #4
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Quote:
Originally Posted by JSutter
Bingo, the hot liquid expands with heat, so it need the extra space for when it gets extreamly hot.
so basically the reservoiur is just there to hold excess coolant? and if i overfilled it with distilled water, there would be no harm done?
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Old 07-13-2006, 07:23 PM   #5
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Suck some out with a turkey baster and dump it down the drain.
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Old 07-13-2006, 08:35 PM   #6
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Quote:
Originally Posted by Bobo
Suck some out with a turkey baster and dump it down the drain.
so it is bad to overfill the coolant reservour? if so, why?
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Old 07-13-2006, 08:54 PM   #7
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As stated above, the fluid might drain out and kill some animals!

Spend less time asking inane questions, and simply take some of the fluid out of the reservoir. Laziness is not a virtue!
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Old 07-13-2006, 08:56 PM   #8
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Quote:
Originally Posted by Bobo
As stated above, the fluid might drain out and kill some animals!

Spend less time asking inane questions, and simply take some of the fluid out of the reservoir. Laziness is not a virtue!
well, besides the fact that i can kill animals...i'm talking about the engine...is there any harm there?
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Old 07-13-2006, 09:15 PM   #9
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no harm to engine at all. Just fill to the maximum marker and call it a day.
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Old 07-14-2006, 07:11 AM   #10
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Quote:
Originally Posted by steven88
well, besides the fact that i can kill animals...i'm talking about the engine...is there any harm there?
I've heard of several instances in other cars (not sure about Maximas) where the engine has seized as a result.

I think it has something to do with the fluid penetrating the walls of the gas tank and the combustion chamber and the resulting mix being lethal!
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Old 07-16-2006, 09:57 AM   #11
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its not bad, and it doesn't hold excess, just as jstutter said. ur coolant expands. when it does that. it might cause smoke too when it overfill the bottle andcomes out the tube.
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Old 07-17-2006, 05:06 AM   #12
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Surprised this thread isn't locked yet. The recovery tank just holds some coolant in reserve in case the radiator coolant became low from a leak or something. If the coolant gets really hot it will overcome the spring pressure on the radiator cap and allow the coolant to enter the tank. If the tank is overfilled the incoming coolant will force the extra coolant out of the overflow tube on the tank. When the engine begins to cool down it will draw coolant from the recovery tank if needed. I would not fill the tank with just water if I were you. I would use antifreeze straight or a 50/50 mixture so you don't dilute the rest of the coolant.
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Old 07-17-2006, 02:52 PM   #13
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I have another issue with this tank I've replaced coolant a year ago with Toyota red stuff the level was stable for some time, I was adding some dist water since there still was some air after replacement. From the time level was stable 3~6 months after replacement it now dropped 1 inch. Do you guys know where it has gone?
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Old 07-18-2006, 08:14 AM   #14
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Quote:
Originally Posted by Nomad
I have another issue with this tank I've replaced coolant a year ago with Toyota red stuff the level was stable for some time, I was adding some dist water since there still was some air after replacement. From the time level was stable 3~6 months after replacement it now dropped 1 inch. Do you guys know where it has gone?

If your radiator is still full it could be there or it could have evaporated.
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Old 07-19-2006, 03:18 AM   #15
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the aliens stole it!
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Old 07-19-2006, 03:18 AM
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