Question about 1993 Mazda 323

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Radiator coolant or reservoir tank always full

I fill my radiator to the brim. after 2 or 3 days the radiator is only one half full but the overflow/reservoir is filled to the brim. this happens always. what seems to be the problem?

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Relax, there is no problem.

When the water / coolant gets hot (inside of radiator/engine) it starts to boil, ofcourse when it boils, it expands, so the fluid in the radiator has to go somewhere, thats why there is the overflow reservoir. So, when the fluid boils, some moves to the reservoir to avoid any potential problems with the radiator, such as it blowing up, or not being able to cool off all of the fluid running through the engine.

But relax, its normal.

Posted on Jul 13, 2009

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You are going to need to check everything on the engine for signs of a leak. also check underneath after being parked for an extended period of time to see if anything is going on the ground. If nothing is coming out that you can see then likely you have an internal problem and coolant is either going into the engine oil or out the tailpipe. A shop can do a hydrocarbon test and a compression test to verify this. One fact remains...if you are loosing coolant, it is going somewhere...You need to find where and fix the problem.

Posted on Jul 13, 2009

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Posted on Jan 02, 2017

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The only thing I can think of that would cause this is if the antifreeze is old or weak or diluted down with too much water. Try the following:prev.gif next.gif DRAIN & REFILL Fig. 1: Remove and drain the reservoir recovery tank 91161p06.gif
Fig. 2: Location of the radiator draincock 91163p27.gif
Fig. 3: Use your hand to unscrew the plastic draincock 91163p28.gif
Fig. 4: To refill the recovery tank, twist the cap . . . 91161p09.gif
Fig. 5: . . . then pull up to remove it from the tank 91161p10.gif
Fig. 6: Adding coolant to the reservoir bottle 91161p30.gif
Fig. 7: Always check the condition of the radiator cap gasket and seal. Place a light coating of coolant on the seal and gasket when installing tccs1079.gif
CAUTION
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prev.gif next.gif

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