Question about 1998 Honda Civic

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When the car is warm the coolant will go into the expansion tank but will not go back in when it is shut off

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Radiator cap could be bad!

Posted on Oct 05, 2009

  • steve t Apr 17, 2010

    yes when the heat inside the radiator cools down, it starts creating a vacuum...and on the tip of the cap there is a small little circular piece that gets sucked away from the rest of the main cap. this allows coolant tank to refill while car rest overnight. check in the morning and see if its to the top, now your in business.! now if its getting lower everyday i"d say that water its slowly bleeding into the cylinders to be ignitied an passed out the exhaust and to never be seen of again. basically the engine block has a crack in a water jacket or crack in the heads or leaky head gasket.that all it could be. can i get a very helpful Thanks

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2004 Polaris edge 600The coolant tank exploded and antifreeze was all over the place. What would cause this? Did even get to ride it yet was warming it up. So it was sitting idle for bout 10.


What was the outside temperature? The heat exchangers are under the running boards/tunnel and require to be covered in snow for efficient cooling. IS this model equipped with an electric fan? If so, is it operational. The thermostat may also be in need of replacement

Feb 14, 2016 | Cars & Trucks

1 Answer

Why does my 1994 bmw 318i coolant disappear from expansion tank?


iT SOUNDS LIKE YOU HAVE GOT AN AIR LOCK ....yOU NEED TO EXPAND YOUR EXPANSION TANK WITH A LARGE FUNNEL.... THIS ALLOWS THE AIR TO PUSH THE WATER UP WITHOUT LOSING IT ALL OVER THE FLOOR.......THE CAR NEEDS TO RUN UP TO TEMP TO ALLOW THE THERMO TO OPEN....THIS WILL ALLOW THE AIR & WATER TO FLOW ALL THROUGH THE SYTEM UNTIL IT REACHES THE EXPANSION TANK................HOPE THIS HELPS......PAUL B.

Aug 16, 2012 | 1994 BMW 3 Series

1 Answer

Why does my 1994 bmw 318i coolant disappear from expansion tank


you have a leak somewhere in your cooling ststem

Aug 16, 2012 | 1994 BMW 318

1 Answer

What is the output of coolant system


It does not have one- it is supposed to be a closed system. Whent he engine gets warm- coolant expands and is forced out into the reservoir/expansion tank, and then sucked back when the engine cools and coolant shrinks.

Jul 13, 2012 | Cars & Trucks

1 Answer

Coolant is not flowing into expansion tank via little hose and car is overheating. As it is getting hot the coolant bubbles and spits coolant through the little hose but it is sputtery like it is tryi


coolant will not flow from the return pipe continuously.when the engine heats the coolant expands returns to tank. coolant fan starts engine cools down return pipe flow stops . fan stops after times, again coolant heats up and flows through the pipe. this cycle continues and go on.

Feb 28, 2012 | Audi A4 Cars & Trucks

1 Answer

Vw jetta iv, temperature alarm sounds and flash with no aparent reason. temperature dial indiator is ok.


I WOULD CHECK BOTH RADIATOR HOSES TO MAKE SURE THEY ARE HOT. THERMOSTAT COULD BE STICKING SLIGHTLY CLOSED.CHECK COOLANT LEVEL MAKE SURE COOLANT NOT LOW.IF COOLING NOT BOILING OUT OF THE EXPANSION TANK. I WOULD HAVE CAR HOOKED UP TO A DIAGNOTIC SCANNER AND CHECK COOLANT TEMPERATURE SEE IF TEMP. OVER 230 DEGREES IF SO RADIATOR COOLING FANS NOT WORKING.COOLANT THERMO SWITCH BAD BOTH FANS SHOULD BE RUNNING AT LOW SPEED.IF ALL LOOKS GOOD YOU COULD HAVE FAULTY LOW COOLANT SENSOR IN EXPANSION TANK.MAKE SURE COOLANT IS IN THE EXPANSION TANK BECAUSE COOLANT LEVEL COULD BE LOW.ADD COOLANT IN THE EXPANSION TANK UNTIL YOU AT MAX LEVEL LINE ON THE EXPANSION TANK.DONT OVER FILL THE EXPANSION KEEP ADDING COOLANT UNTIL COOLANT LEVEL STAYS AT THE MAX LEVEL LINE ON THE EXPANSION TANK.

Jun 27, 2011 | 2003 Volkswagen Jetta TDI

2 Answers

Cant find the valve to let air pressure from my radiator for my water to flow right


FILL COOLANT SYSTEM UP BY POURING COOLANT IN THE EXPANSION TANK UNTIL COOLANT LEVEL STOP DROPPING IN THE EXPANSION.WHEN YOU POUR COOLANT IN EXPANSION TANK AIR BLEED OFF THROUGH THE SMALL COOLANT LINES GOING TO EXPANSION TANK.WITH PRESSURE CAP OFF RADIATOR COOLANT LEVEL IN EXPANSION IS AT FULL COLD MARK.WHAT YOU TO DO CRANK ENGINE UP LET IDLE WARM UP UNTIL COOLANT DROPS IN EXPANSION TANK KEEP ADDING COOLANT UNTIL STOP DROPPING STAY AT FULL COLD MARK.WHEN COOLANT LEVEL START RISING IN EXPANSION TANK.PUT PRESSURE CAP BACK ON RADIATOR.WHILE ENGINE IDLING WATCH TEMPERATURE GAUGE.IF START CLIMBING TURN OFF ENGINE LET IT SIT FOR LITTLE WHILE TAKE A LARGE RAG OPEN RADIATOR PRESSURE CAP A LITTLE AT A TIME TO KEEP FROM GETTING SCALDING TO RELEASE AIR IN COOLANT SYSTEM.WHEN PRESSURE IS RELEASED OPEN PRESSURE CAP ADD MORE COOLANT IN THE EXPANSION TANK.CRANK ENGINE AGAIN LET IDLE WHEN TEMPERATURE GAUGE START CLIMBING. TURN OFF ENGINE WAIT FOR WHILE BEFORE OPEN RADIATOR PRESSURE CAP.WHEN YOUR THERMOSTAT OPENS WHEN TOP RADIATOR HOSE IS HOT AND ENGINE COOLANT TEMPERATURE GAUGE STOP CLIMBING AND COOLANT LEVEL STOP DROPPING IN THE EXPANSION TANK.ALL AIR IS EXPELLED FROM COOLANT SYSTEM TO KEEP ENGINE FROM OVERHEATING.

Jun 10, 2011 | 2001 Cadillac DeVille

2 Answers

Hi, i have been having a problem with something in my 2001 a3, when i first start the engine in the morning (cold mornings) the coolant red lamp comes on with a beep, i keep the engine running for about 3...


The lamp is turned on by the level sensor in the coolant expansion tank. In the morning when you start your car the light will illuminate if the coolant level is lower than the recommended level. As the engine warms up the heated coolant expands and fills the expansion tank back above the point where the light turned on. Add a little more coolant and see if the light stays off next time you start the car for the first time. Mine does the same thing. Hope this is your answer!

Jan 06, 2011 | Audi A3 Cars & Trucks

1 Answer

Water leak from top of expansion tank.2000 BMW 316i se


The water (coolant) in the expansion tank will rise and fall with the engine temperature. What the expansion tank does is collect and return coolant to and from the engine. When the engine warms up the coolant gets hot, builds up pressure and opens up the radiator cap. The coolant then goes into the expansion tank. Now when the engine cools down the pressure drops in the cooling system and the pressure drop (vacuum) pulls the coolant back into the engine via the radiator cap. The radiator cap allows the cooling system to build up pressure and by doing so increases the boiling point of the coolant, but when that pressure exceeds the caps rating the cap opens and the coolant goes to the expansion valve. The cap has another part to it that when the engine cools down and a partial vacuum is created in the cooling system a "valve" in the radiator cap opens and allows the coolant to be drawn back into the engine. I would look at your radiator cap to see if any gunk or build up is on it, and check the rubber gaskets for cracks. It's easiest just to replace the cap because they are inexpensive and easy to replace (2-10 dollars). The expansion tank should have two hoses on it. The one on the bottom comes from the radiator and the one on the top (possibly part of filler cap) runs down and is open to the ground. That way if it is overfilled or becomes overfilled it will slowly leak onto the ground. When and if you change your radiator cap, make sure the engine is cooled down, remove cap and start engine and turn heater to full blast, full heat. Leave the cap off and let it run until engine warmed up. This should burp out any air pockets that may have happened when coolant was changed. Also top off the coolant in the radiator while it is running. Hope this helps and good luck

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