Question about Honda Civic

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My car overheat very high. my reserve tank will over flow and will boil up, and then runs out of coolant. why?

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  • Ned C Cook
    Ned C Cook May 11, 2010

    When does it overheat? Going dow the road at speeds above 35 or low speed and idle?

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Without having too many details, I would say check the thermostat. I had the same problem in my Eclipse. I took the thermostat out and haven't had any problems since.

If you don't change your radiator fluid often, it causes the thermostat to gum up and stick. If it sticks in the closed position then no radiator fluid runs into the engine and then the engine overheats.

Posted on Jun 29, 2009

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When the engine overheats, steam moves to the reserve tank to relieve pressure in the system, and can seem like it is overflowing.

Civic cooling systems always require an auxilliary fan or blower. Have this checked for serviceability. If the aux.fan is working properly, this points to other problems with your cooling system, which may include faulty hoses, water pump failure, and/or water temp. sensor failure.

Hope this helps.

Posted on Jun 29, 2009

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Posted on Jan 02, 2017

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SOURCE: overheating coolant boiling out into reserve tank

you have a blown head gasket.. doesn't have to have coolant in the oil for a blown head gasket... if hoses are rock hard when running then you have exhaust leaking into the coolant via a blown head gasket...

Posted on Jul 14, 2012

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1987 dodge w150 power ram overheats.could this be air in the coolant lines? I parked the truck because it overheated while driving it.the temp Guage went over 220 -230 by the time I shut it off and kept...


If the unit overheated and there was no coolant flowing into the reserve tank, then there is two possible issues that must be addressed immediately. Either (1) There was not enough coolant in the system. This is because when the coolant heats up it expands and will go to the reserve tank. The fact that there was going to the tank indicates that the system is less than full, or (2) The radiator pressure cap is defective.

I would flush the cooling system, clean the reserve tank, replace the radiator cap, and refill the system and retest.

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What is causing antifreeze to come out overflow tank?


Could be a defective radiator cap, or a leaking head gasket.

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2002 freelander land rover coolant boiling in reserve tank


Hi there the common problem found with your car is one thermostat sizes and will not let the water pass threw this in turn will cause boiling in the head and overflow bottle .2nd have a look at water hoses around engine and radiator they leak a bit , if no leaks are found my guess thermostat

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Overheating coolant boiling out into reserve tank


you have a blown head gasket.. doesn't have to have coolant in the oil for a blown head gasket... if hoses are rock hard when running then you have exhaust leaking into the coolant via a blown head gasket...

Jul 14, 2012 | 1998 Plymouth Breeze

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Do not overheat but shoot coolant out the reserved tank


I have found that this happens when I over fill the overflow tank. It should be about one third full to allow redraw of fluid when the car cools. Also check the state of the radiator cap. I would replace it if it looks corroded because if the over flow valve here is no good you would lose coolant back to the overflow tank and quickly run low on coolant, not to mention less cooling at lower pressure.

Dec 14, 2011 | 1996 Cadillac DeVille

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My pontiac grand am 2003 is running hot. the


Change the thermostate, if that doesn't work it might need a new water pump and new hoses. Try getting the radiator flushed.

Jun 30, 2010 | 2003 Pontiac Grand Am

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What is the coolent reserve tank for???? IF broke does it need to be fixed immedatley? Mine is busted and I was wondering if my car is going to overheat now. THANKS


The coolant reserve tank is a medium for the radiator to breathe. Water passes from the radiator to the coolant reserve tank and fort.

The car might not necessarily over-heat if the coolant reserve tank is broken, but it is advisable that you replace it to enable it serve its purpose within the operations of the car engine.

Good luck.

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I have a 2001 chevy Malibu. Have problems with


Due to the complexity of the newer cars on the raod today!! what you are experiencing is Normal!!! since the coolant systems on the newer cars run at such a higher pressure and a high Rpm the reserve tank which has it's on drain hose for excessive overflow from the radiator allows the extra high pressure release from the radiator to back flow to the reserve tank and then out the reserve tank overflow hose on to the raod

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Overheating,reserve coolant tank boiling I have a 2000 Ford Taurus with the similar problem. I had my water pump replaced then this started.


Ford 2000 Taurus

To solve the problem you have the things to do in this order;

) When the engine is cold top off the radiator with fluid. (When the pump was replaced the fluid should have been also)
) Make sure the radiator fluid has anti-freeze in it. This is also anti boil also !
) Add fluid to the overflow reservoir.
) Make sure the drive belt was replaced on the water pump.
) With the engine running, you can add fluid to the radiator for the first minute or so. You want to get air pockets out.
) Replace radiator cap.
) Let car warm up. When it's hot you should get the radiator fan coming on.
) When it get hotter the air-conditioning fan may come on.
) If the fan does not come on, the heat sensor is probably bad.
) If all fans come on, and it overheats, you may have a bad thermostat. Trace the upper radiator hose to where it connects to the engine. That's where it located.

Do not operate the engine when it overheats, You will damage the head gaskets and cause radiator fluid to leak into the cylinders.
If you smell radiator fluid in the exhaust fumes, it may already be leaking.

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