Question about 2004 Honda CBR 125 R

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Had a small leak in the radiator of my CBR 125. How do I refill the radiator? Through the Radaitor Cap or via the expansion tank?

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Take ya left fairings off ( Ball ache) then theres a small screw on the radiator cap undo that and fill it from there. if its been leaking id suggest i little bit of k seal or rad weld in it just to be safe. and top up your reserve tank. thats under your seat. just pop the back seat n its a screw in the back to get it up

Posted on May 11, 2011

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Posted on Jan 02, 2017

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1 Answer

Why coolant level in refill tank drops with no apparent leak?


Hi Ayaz
if there no leak detected that means the radiator cap is not holding the pressure, that cause the coolant to travel to the expansion tank and flood out, then when engine cool down, it will suck the coolant back to the radiator and leave the refill tank empty.
Replace the Radiator Cap

Good luck

Nov 22, 2015 | 2006 Toyota Previa 2.4

2 Answers

What is the best way to refill a sealed radiator unit for 1998 ford f150


When engine cold, Unscrew the radiator cap on the expansion bottle and top up the coolant level to the minimum level marker, then replace the radiator cap.

Nov 22, 2015 | 1998 Ford Contour

1 Answer

Water flowing out of radiator when idling 93 nissan terrano v6 petrol auto trans


If the coolant was hot when you noticed water coming out the radiator, that is normal from the heat expansion of the coolant. That is why there are coolant overflow tanks-also called coolant expansion tanks.
When refilling coolant, always top up the radiator, and fill the overflow tank to at least the cold mark level (about half-way up on the tank). With cap off, run engine till the thermostat opens- upper radiator hose will become hot-then shut off engine, add coolant to radiator as needed, replace cap. This method of filling will help to expel any trapped air in the system. Oh, and remember to set your heater controls on high when filling coolant, so the heater core and lines also circulate and expel air.
Check the seal on the radiator cap that it is still good. The cap seal is important to seal the coolant system, as it is a closed system under about 15 psi of pressure. The reason to pressurize the system is that the pressure will raise the boiling point of the coolant by about 10 degrees- important when you consider how hot the coolant has to be when running. OK, enough tutorial-I don't think you have a problem with the water pump! G'd luck, reeve.

Nov 22, 2012 | 1993 Nissan Pathfinder

2 Answers

Hi i have a 2000 ford focus it seems that the water is bubbling over and then i have to refill the water every time i go on a journey what is the problem


Does it overheat on you ??? If not,, try replacing the radiater cap..Make sure the vehicle is cold before removing the cap..If that doesnt do it,,and the vehicle not overheating,,you may have a small combustion leak..Like a head gasket..But first try the cap..

Sep 25, 2011 | 2000 Ford Focus

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

1 Answer

Motorcycle, Honda VT1100 Series 1995-2007: Can you refill a dry radiator throught the overflow tank or do you have to remove the gas tank to get to the main fill cap?


Hi allways fill the radiator on closed cooling systems the small expansion tank is just there for a bit of extra capacity if needed if you can get to an upper coolant hose instead fill it from there but ideally at the radiator cap the start the engine and at idle let it warm up until the thermostat opens and the top hose gets hot topping up the whole time it needs it then put the cap back on and fill the expansion tank to the correct level let it cool down and recheck the level when cold top up if needed

Mar 01, 2011 | Honda VT 1100 C Shadow Spirit Motorcycles

1 Answer

Where is the radiator cap located on 2001 Saturn SW2?


Your system does not have a cap on the radiator. It is a 'sealed system' with the reservoir holding pressure. This is not so much an 'overflow' tank like some systems, but an expansion tank.

You can add the stop leak directly into the tank.

Feb 06, 2010 | 2001 Saturn SW

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

Apr 03, 2009 | 1992 BMW 3 Series

1 Answer

Symbol lit up


there can be a yellow light in the cluster that looks like a small radiator or box with waves inside of it to indicate water. This light means that the coolant level sensor has detected a low coolant level. Typically the expansion tanks inside of these cars will crack from heat and age. A simple diagnosis is to check your coolant level and top it off. Do not forget to bleed it by unscrewing the bleeder screw found on the upper radiator hose while filling up the reservoir found on the right hand side of the radiator. once the coolant has been filled, tighten the bleeder screw back down but be careful not to over tighten. and finally screw on the expansion tank cap. run the vehicle to operating temperature and use a flashlight to inspect the engine bay for leaks. If there is a leak, it will need to be repaired. possible leaks are a cracked expansion tank, leaking radiator hoses, or a leaking water pump or thermostat.

Oct 29, 2008 | 2001 BMW 325

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