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for some reason my overflo tank keeps coming up to high if no at the top.i replaced the themastat,water pump,and flushed the radiator out and it was good.has anyone had this problem before.i just cant seem to figure this one out

 
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Is it at high when the car is on or off? When driving does your temp gauge bounce?

 
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Does your car overheat? If it does chances are you have a bad headgasket

 
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no it hasnt over heated at all yet,when im driving on the freeway going 80 plus por smashing the resevoir goes almost to the top and when i turn the car off and let it cool down the level still stays high

 
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Sounds like the thermostat to me.. but not for sure. I know that that the coolant flows through the system when the thermostat reaches a certain temp othewise it stays closed and only runs in the engine. I think you said you fixed the problem.. but you can test the thermostat by taking it out and putting in a pot of water and boiling it with a thermometer in it to see what temp it begins to open and what temp it starts to close... you'd have to find out what the specs on the thermostat are.. I never tried it but my professor (ASE master tech) taught my class that. Anyways good luck

 
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yes i just replaced the thermistat to a 170 temp about 200 miles ago.that is supposed to be stock temp.just got back from a 50 mile freeway run driving 70 or 80 ,and the overflow tank was over the max level, just a few inches from the top but not over flowed and no over heating. befor i left i put the level low.

 
Rep Power: 388

I think you got air in your system. To get it out, do this..

Park on a level surface and when the car is cool, I mean completely cool, take the rad cap off. Fill up your reservoir so its at the halfway point between low and max. Turn the car on and let it idle till there arent any bubbles coming out of the rad, about 10 mins or so. Then turn car off, add coolant to the rad so its up near the top and turn it back on so any other bubbles come out. Repeat this till the coolant level doesnt drop. All air should be outta your system at this point.

 
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ok ill try that in the morning when i wake up ill get back to say how it went

 
Rep Power: 388

Make sure your using Honda brand coolant, type 2 in your car. Dont use the prestone autozone stuff or whatever other brand- use strictly honda coolant.

 
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dont overfill ur resivior either.

 
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i like to keep a lil extra in there just in case. its got a long neck lol

 
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You may have a bad radiator cap. Replace with new. Make sure you get Honda cap. Bring your VIN # when you purchase the cap because the civic had two radiator manufacturers (at least the 2001 model did) and you want to match up the correct cap. Make sure your radiator fans are working. They are turned on when the temp sensor located in the T'stat housing detects a pre determined temp. The fans should come on while reving the engine just above idle speed/rpm and the engine is at normal operating temp. The fans will come on and go off after a few seconds. More than likely you have a blown head gasket and you are getting exhaust gases in your cooling system. The gases fill the radiator/coolant system and force the coolant out into the resevoir. Eventually the resevoir fills up and coolant burps out making a mess of the engine compartment. Eventually enough coolant will be lost and you will overheat. There is a test method for this issue. You can rent an exhaust/combustion gas tester from Autozone. It uses a glass tube and suction bulb to pull gases from the radiator. When the gases pass thru a blue liquid chemical it changes from blue to yellow if exhaust gases are present. If this is the problem the head must be removed, milled and new head gasket installed. The reason i know all of this is because i have just completed such a repair last weekend. I am currently monitoring the level of coolant in the resevoir and so far so good. I did have to replace one of the upper radiator hose clamps because it was leaking a little. Those spring ring type clamps suck.