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I am not sure if it the water pump, but we are losing water and there does not seem to be any leak in the coolant reservoir.

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A water pump would not likely cause loss of water,mainly overheating problems.First fill the radiator full and the overflow full,you can use water to do this,it is not necessary to waste antifreeze.You do not need a 100% mix of antifreeze.During winter where it gets below freezing,you really only need about 70% antifreeze to prevent freeze.Maybe a little more if you are 1 or 2 states from Canada.If you open the hood and let the car run,watch the tubes and the radiator and the hoses,follow anything hooked up to the radiator.If you end up getting a big leak or puddle,dilute it down with tons of water.Birds for some reason like the taste of antifreeze however it kills them.Good luck! Greg

Posted on Aug 29, 2010

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1 Answer

Loses water from resevoir but not from radiator


So the level keeps dropping in the reservoir? If you have to keep adding coolant to the reservoir, the system is leaking or losing coolant somewhere. Have the system pressure tested to find the leak. Is the reservoir itself leaking? When the level gets low enough, first the reservoir will go dry, then the radiator level will start to drop.
Here's how the reservoir works: coolant is under pressure from the radiator cap seal. As coolant heats up from hot engine, it expands, and pressure forces the radiator cap seal up, coolant is forced into the reservoir-remember the hot mark on the reservoir? When car is shut off, coolant contracts, creating a vacuum in top of radiator. This vacuum works to suction coolant back from reservoir into the radiator, keeping the radiator topped up, and coolant should now be at the lower cold mark on the reservoir. It is a closed, sealed system. The only loss of coolant will be a very small amount of evaporation from the reservoir. If coolant level keeps dropping, there is a leak somewhere.

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9_20_2012_11_32_33_pm.jpg

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