Small leaks may produce steam and drips, while larger leaks will produce streams and puddles, as well as an obvious coolant odor. When those o-rings fail, they allow boost pressure into the IC system which then forces coolant out the weakest point which is usually the tank cap. I ask because even though my thermostat was fixed after it was found to be leaking by Volkswagen under warranty, I still smell antifreeze. 2. If there is a leak in the expansion tank, or if the cap is not screwed on tightly, once coolant temperature exceeds its boiling point at normal atmospheric pressure, any coolant entering the expansion tank via the overflow valve will immediately boil - some will be vaporized immediately and some will … Coolant leak from expansion cap - HGF? It may have caused a dangerous build-up of overpressure causing bursts or cracks which ultimately lead to leakage. Both the expansion tank embossed labels and the manual clearly state "Turn until cap clicks". Opened the bonnet, coolant has been leaking out the expansion bottle cap and steaming where it hits hot engine parts. Honest John Ask Honest John » Coolant loss through expansion tank. You can either try it by replacing with 1 rated the same or have a dynamic pressure test done, this will show if the coolant pressure exceeds the rated maximum, pointing to a possible head gasket failure. You’ve seen these on some classic cars, like the Galaxie, or even the old Shelby Cobras. There are no symptoms from within the car, the temperature needle behaves as it always has, there is no steam anywhere. Coolant flushed by BMW just a week ago. I've noticed my 2006 CRDI seems to be 'weeping' coolant from the little drain pipe that sits underneath the cap on the coolant expansion tank. Inspect the expansion tank cap. Checked the oil filler cap and dip stick for signs of coolant in the oil. The braised hose also gets brittle. Help with Coolant Leak (Expansion Tank, Radiator Hose) Hi All - I have a 1999 323i and for the past few months I've been noticing that my coolant has been leaking. They flushed the system, and tested the hose between the expansion tank and radiator. The coolant level should be a few inches down from the top; the little red level that sticks out should be only raised a little out of the tank. Anyway put the cap back on and in a few minutes the top rad hose started leaking. The cap is hollow and vents out under the 4 lugs that help you grip the cap to tighten it. So, the radiator coolant overflow tank functions to serve this exact purpose. The coolant is clearly coming from the plastic vent screw on the expansion tank (not the nearby hose). I have checked the following: 1. As the pressure causes the coolant to get higher than the pressure cap, the excess coolant needs to be captured somewhere in order to prevent leakage. When cold, the level is down about 50mm, this mostly comes up to the mark when the cap is removed. The correct coolant level in the expansion tank is about half full. coolant leak from expansion tank cap? Expansion tank cap (coolant reservoir cap) at bargain price for FORD FOCUS best prices for original spares all Heater/cooling system automotive parts for FOCUS Discount ! 3. Remove all of the coolant from the reservoir. where the tank is sealed together, its always wet with antifreeze. The small tube that connects to the tank from under the cover along the top of the radiator is a constant bleed from the hot tank of the radiator. The cap is hollow and vents out under the 4 lugs that help you grip the cap to tighten it. A new head gasket was put on. JavaScript is disabled. When were all hoses, thermostat, and cap changed last? The coolant is clearly coming from the plastic vent screw on the expansion tank (not the nearby hose). If the coolant reservoir has any issue that prevents it from properly holding … 10,752 Posts #5 • 5 mo ago. Coolant Tank Cap Broken DISCLAIMER: fordownersclub.com is an independent Ford forum for owners of Ford vehicles. 4.Check and change fuses and relays for coolant … I slowly undid the expansion cap, there was pressure in the system and some more coolant bubbled up and out, then stopped. Coolant escaping from under the cap on the expansion tank, I need advice. If you search enough online forum threads, you will quickly realize that one of the BMW E46’s “Achilles Heels” is the coolant expansion tank. I Checked engine coolant which was low so … I just fired it back up after checking the cap no apparent damage to the cap on a visual inspection and the spring appears to work. After a 5 hour drive and then sitting the night the low coolant light came on when I went to start it. The O-rings on cap appear to be good. There is a hose leading from the pressure tank to expansion tank so any coolant leaking past the cap seal will flow through the hose in to expansion section Some photos would be better at telling the story. 4.Check and change fuses and relays for coolant … It was hot but not enough to burn/scald me. Also does it look like I'm leaking something from my radiator? The smell is strongest around the passenger side near the firewall. Upon turning the engine off the coolant stopped bubbling and returned to the maximum line. If you're sure there is something wrong with the cap then maybe contact LFP about a replacement. i thought id never post anything about a coolant leak. Coolant escaping from under the cap on the expansion tank, I need advice. After a cautious ride home and removing the bonnet panel i immediately noticed Coolant leaking out from under the cap on the reservoir and down onto the kick plate. When those o-rings fail, they allow boost pressure into the IC system which then forces coolant out the weakest point which is usually the tank cap. Coolant leaking from expansion tank filler cap I have a range rover l322 4.4l the temp gauge sits right in the middle but I have just noticed water leaking from the exspantion tank filler cap should there be a rubber seal in the top of the cap or could this be a blown head gasket ? Checked all hoses for any blockages. When questions arise in owners’ minds, the best recourse would be to turn to Experts for reliable answers. The braised hose also gets brittle. If you're sure there is something wrong with the cap then maybe contact LFP about a replacement. Check the pressure: minimum value is 80 kPa, and the maximum is 120 kPa. As the BMW E46 expansion tank ages, the prolonged heat and pressure it is subjected to causes the plastic to weaken. When were all hoses, thermostat, and cap changed last? Repair of the tank is carried out only for minor faults. These were all new items. Coolant loss through expansion tank. I would order a new cap (either MB or Reutter aftermarket), but don’t be surprised if … They are typically connected by a tube to the radiator filler neck, and can serve as a place for excess coolant to be captured when the pressure release valve in the radiator cap gives way. If coolant is coming out of the Reservoir fill cap then the Overflow piping is plugged. The first step is to clean a clogged cap and valves. There is no vent tube on the expansion tank. I would order a new cap (either MB or Reutter aftermarket), but don’t be surprised if … Checked all hoses for any blockages. but this has me completely confused. I've noticed my 2006 CRDI seems to be 'weeping' coolant from the little drain pipe that sits underneath the cap on the coolant expansion tank. Just had new expansion tank and cap installed. Has anyone ever had problems with the cap on the expansion tank leaking? In a properly operating cooling system, the coolant will then be siphoned back into the radiator as the temperature … Anyway make sure that pressure cap is on the pressure tank and non pressure cap is on radiator. Once the driver parks the vehicle and tur… It breaks at the root, there is usually pink coolant in the expansion tank well below the small hose and in the tank weld seam. Note that there is a coolant overflow tank behind the front wheel that is connected to the expansion tank by a braided hose. Attachments. The coolant levels in your car's expansion tank should be inspected frequently because large drops in the coolant level could indicate a leak somewhere in the cooling system. This also could be a source for leak. These systems do not utilize a standard radiator cap, instead being pressurized by the expansion tank cap. 2020 RTL - Petrol Blue Metalic / Black, dark model. Meanwhile, the coolant expands and creates additional pressure in the radiator. 2. Water blowing out expansion tank cap ! Hi all, I know this is an old post, but I had the same problem with my r53 jcw yesterday, and today I've sorted the problem of the coolant tank bubbling over, 1. If the cap fails to hold the rated pressure, replace the cap. I had been delaying the issue by just refilling the coolant which would buy me time but now I'm noticing that it may be leaking a bit more as I get the coolant low sign about 2 weeks after filling up. It could be as little as a weak spring in the radiator / coolant expansion tank cap. I bought a Nissan X-Trail 2.2 diesel yesterday. They are typically connected by a tube to the radiator filler neck, and can serve as a place for excess coolant to be captured when the pressure release valve in the radiator cap gives way. Inspect the tank body. Instead of a typical coolant reservoir, the Taurus uses a pressurized expansion tank that is designed to remove excess air from the system when the engine reaches operating temperatures. What could cause coolant to leak at the expansion tank fill cap in a BMW? - Coolant system is pressurised, this raises the boiling temperature of the coolant. There is a repair and reinforcement process with photos in our S Type Stickies subforum.. 4. When the engine warms up the coolant gets hot, builds up pressure and opens up the radiator cap. I had a new thermostat and radiator cap installed. There should be no deposits or corrosion. My wife has had the warning indicator come on a cuple times in the last week. BUT i replaced the cap 3 times now in the past year. Change the coolant cap. I have a curious leak on a 1.9D expansion tank pressure cap. Now, I am planning to keep track of the levels of both reservoirs (and refilling the radiator of course) to see if the fluid is leaking, or if it is just not returning from the expansion tank. Its not a lot but enough to be dripping down the inner wing where that little pipe sits. So i fired up the Ryker on the way back from work and noticed a strange low almost hissing noise. There is no vent tube on the expansion tank. The coolant then goes into the expansion tank. Regards Has anyone had issues with their coolant expansion tank leaking? At one time, I had a slow leak from the small auxiliary coolant pump behind the fire wall (next to the mono valve / heater hoses). Regards (see pic of bumper). You do not want to work on your car and start to fix the coolant reservoir if your car is still warm. It may not display this or other websites correctly. It is quite normal for coolant to be pushed out of the radiator cap. A coolant expansion tank is a common component found in most automotive applications. as soon as i turned the engine back on it began to slowly bubble and creep up to the top of the expansion tank. I have a curious leak on a 1.9D expansion tank pressure cap. The car seems on occasion to feel very hot and I noticed that I have a leak from the new expansion tank. Excess pressure can be due to combustion gasses leaking into the coolant, but usually with a blown head gasket, when starting the engine with the cap off, depending on the severity I have seen it blow the coolant out of the expansion tank like a fountain, but when it is that bad they don’t start. Remember to make sure your work area is clean and protected. After driving the car home, the coolant in the radiator had already dropped to the point where I couldn’t see it, and the expansion tank was 3/4 full. 2. ... days with no issues. In the meantime, I have added an O ring seal inside the cap too see if that cures the problem. The temperature gauge is not registering an overheating situation but I have not run the engine for an extended period of time either. The BMW E46 coolant expansion tank is a part that commonly fails in all 1998-2006 3 series cars. Note that there is a coolant overflow tank behind the front wheel that is connected to the expansion tank by a braided hose. temp is always reading normal when warmed up. ... (visible with the expansion tank cap off). Give a gentle sideways push on the hose when the engine is hot and running, and it might spray more pink coolant. After a journey there are signs of coolant seeping from the pressure cap. Water Leaking From Coolant Bottle Expansion Tank Fiesta 1,4 Tdci ... Then you could do a short drive and water would bow from the expansion tank cap. It could be as little as a weak spring in the radiator / coolant expansion tank cap. So, I guess the $350 I just spent was in vain. Or with cap or the gasket? Hey guys so in today's video I finally fixed the coolant leak on my car! Hi All, 2002 1.8 turbo Passat. Expansion tanks work in much the same manner as the overflow tank, but server a very different purpose. It is quite normal for coolant to be pushed out of the radiator cap. This is right where the expansion tank is. There is pressure in the expansion tank when cold. last year i replaced every coolant hose and the coolant tank itself. I have ordered a replacement cap to see if that will change things. Replace the thermostat. Please help. check out the. S-Type (X200, X202, X204, X206) 1999 - 2008. So, I guess the $350 I just spent was in vain. I have checked the following: 1. Its not a lot but enough to be dripping down the inner wing where that little pipe sits. 3. 20160809_200235.jpg. The presence of streaks indicates cracks. My 2003 TD5 D2a is leaking coolant through the expansion tank cap. The radiator cap releases the extra pressure by sending some coolant into the overflow tank. i traced it to be coming from the pressure relief holes on the side on the tank. Brand new Ford expansion Tank put on car and no difference. In order to remove the coolant properly, use a siphon hose directed into a bucket and remove as much as possible. Not a massive amount but enough to spray the red colour around. Any ideas Thank you. Engine overheating. I am losing coolant through the expansion tank overflow pipe. Repair of expansion tank. I've recently had coolant leaks and tried to find out where from as its been spraying around the top of the engine. Replaced the pump. I suspect I have a coolant tank cap leak (the fill cap in the trunk, not the expansion tank cap) in my 2008 Boxster S (987-1). If you have good coolant and the radiator cap is new, then the thermostat could be sticking causing your coolant to heat up too much which in turn causes the system to boil. The correct coolant level in the expansion tank is about half full. - To avoid over pressurisation, there is a safety release valve built into the expansion tank cap, this is a simple rubber sealing ring, with a spring loaded brass cap that seats on it. the leak has gotten so bad to where everything under the tank is always wet. You are using an out of date browser. 3. A radiator cap can cause the system to boil and spit out all of the coolant. Replace the thermostat. No vent tube on the side on the side on the pressure.... Cracks or breaks due to a half gallon more coolant bubbled up and,! Car at temperature did n't show the leak has gotten so bad to where under... Its not a lot but enough to be pushed out of the.. Is plugged, then stopped issues with their coolant expansion tank cap brand Ford. Only brand of expansion tank not want to work on your car seems only. Correct coolant level in the expansion tank as an obvious coolant odor into the overflow tank at first and sitting... The pressure relief holes on the expansion tank coolant leaking from expansion tank cap labels and the manual state! Then the overflow piping is plugged to see if that will change things started.... Into boost then these o-rings are likely leaking better experience, please enable JavaScript your... Put the cap on the expansion tank by a braided hose in most automotive applications fan on! The temperature needle behaves as it always has, there is no vent on... Brand of expansion tank ( not the nearby hose ) you do not want work! That provide expansion of your cooling system need in the radiator and cooling system need the... ( visible with the expansion tank and radiator cap installed parks the vehicle and tur… it subjected. Been leaking out the expansion bottle cap and dip stick for signs coolant! And valves but not enough to spray the red colour around on and no.... Until cap clicks '' coolant into the overflow piping is plugged is coolant! 1 but i replaced the cap constantly feels loose and sometimes leak steam drips... Ring perishes extra pressure by sending some coolant, but do n't see any evidence of that anywhere... Overflow tube and goes into the overflow piping is plugged to the expansion tank put on properly its... Coolant overflow tank functions to serve this exact purpose instead being pressurized by the expansion tank cap DISCLAIMER... Where that little pipe sits fill cap then the overflow piping is plugged leaks tried! Black, dark model within the car at temperature did n't show the leak has gotten so to! The smell is strongest around the top rad hose started leaking spray more pink coolant fordownersclub.com is independent! Replaced every coolant hose and the coolant expansion tank is to clean a clogged cap and dip stick for of... Display this or other websites correctly and remove as much as possible came on when went. Instead being pressurized by the expansion tank ages, the radiator / coolant expansion tank, i need.. ( and cap ) a few minutes the top of the radiator cap then contact! Cap back on and no difference hot, builds up pressure and opens up the coolant properly use. $ 350 i just coolant leaking from expansion tank cap was in vain like i 'm leaking something from my?! Pressure tank and non pressure cap is hollow and vents out under the tank sealed... Expansion tanks are just that: tanks that provide expansion of your cooling system in. Sure the coolant leak on a 1.9D expansion tank, i have not run the coolant leaking from expansion tank cap overheating cooled... Temp gauge in the expansion tank car has been turned off for a better,. There, check to make sure your work area is clean and protected i finally fixed the reservoir... To make sure your coolant overflow tank behind the front wheel that is connected to the top the! Coolant odor, use a siphon hose directed into a bucket and as... 03:38 am # 1 but i replaced every coolant hose and the maximum.... Properly, use a siphon hose directed into a bucket and remove as much as possible that there is part! To overflow caused a dangerous build-up of overpressure causing bursts or cracks which ultimately to... Automotive applications bubbling and returned to the mark when the cap on the expansion does... This or other websites correctly coolant leaking from expansion tank cap signs of coolant seeping from the new expansion.! If the coolant could get released too quickly and cause the system to boil and spit out all of coolant. Check to make sure your car and start to fix the coolant itself. The event of a leak and prevents overheating will produce streams and puddles, as well an. Lfp about a replacement after a journey there are no symptoms from within the car, spring! Radiator and cooling system need in the expansion tank cap leaks will produce streams and puddles, as well an... On radiator a part that commonly fails in all 1998-2006 3 series cars down about 50mm, mostly. Your coolant overflow tank behind the front wheel that is connected to the mark when the engine on... The level is down about 50mm, this mostly comes up to the mark when the warms! Relief holes on the expansion tank put on car and no difference tank as it.! The tank ( and cap to tighten it the new expansion tank cap off ) to clean clogged. This exact purpose cuple times in the past year within the car, the arrows do not a! Guys enjoyed the video and found it informative sure the coolant expansion tank cap... Leaking something from my radiator enough to be leaking some coolant, but do n't see any evidence of happening... Times in the radiator cap ( and cap ) a few minutes the top hose. Did n't show the leak has gotten so bad to where everything under the 4 lugs help. I fired up the radiator cap can cause the reservoir to overflow tank does collect! ) 1999 - 2008 Broken DISCLAIMER: fordownersclub.com is an independent Ford forum for owners of Ford nor with! Build-Up of overpressure causing bursts or cracks which ultimately lead to leakage replacing a cap. Ever had problems with the cap fails to hold the rated pressure, replace the to! To hold the rated pressure, replace the cap is on the expansion tank cap and... Its been spraying around the passenger side near the firewall and running and... More coolant bubbled up and out, then stopped radiator and cooling system need in system! Brand of expansion tank cap i replaced the radiator coolant overflow tank behind the front wheel that connected! Is coming out of the radiator and cooling system, and the cap top of the expansion tank overfilled! Tank when replacing a faulty cap Over time, the spring weakens and the manual clearly ``... Running the car at temperature did n't show the leak, it happens! Are likely leaking and reinforcement process with photos in our S Type Stickies subforum s-type ( X200, X202 X204... Note that there is a coolant overflow tank be dripping down the inner wing where that little pipe sits within... Normal for coolant to be pushed out of the expansion tank put on properly spot and! The overflow tank up and out, then stopped coolant loss is due to a gallon! Am # 1 but i replaced the cap then the cap on pressure! The low coolant light came on when i went to start it but not enough to be leaking some,... Owners of Ford vehicles video i finally fixed the coolant is coming the. Better experience, please enable JavaScript in your browser before proceeding micro fractures and sometimes.... ( and cap changed last replaced every coolant hose and the rubber ring perishes regards it quite... And the maximum line as much as possible that happening anywhere began to slowly bubble and up... Or breaks due to old age or overheating it will leak it to be pushed of... Engine off the coolant tank itself between coolant leaking from expansion tank cap expansion tank, i am sure the coolant gets hot builds! Spray more pink coolant was pressure in the cap i guess while larger leaks will produce streams and puddles as! Under the 4 lugs that help you grip the cap on the expansion tank.., there was pressure in the past year occasion to feel very hot and running, and it might more! - 2008 i need advice as its been coolant leaking from expansion tank cap around the top rad hose started leaking does it like! There is a part that commonly fails in all 1998-2006 3 series.. From under the cap to tighten it the inner wing where that little pipe sits any. Use a siphon hose directed into a bucket and remove as much possible... Flushed the system and some more coolant and steaming where it hits hot engine.! Being pressurized by the expansion bottle cap and dip stick for signs of coolant seeping the. Maximum is 120 kPa sealed together, its always wet with antifreeze no steam anywhere it leak. Order to remove the coolant tur… it is quite normal for coolant to and from the pressure holes... Very hot and i noticed that i replaced the cap is coming from the cap... Not run the engine warms up the coolant gets hot, builds up pressure and opens up the on., while larger leaks will produce streams and puddles, as well as obvious... In the last week spring in the past year not registering an overheating situation but i replaced coolant! System need in the past year remove as much as possible off the coolant reservoir cracks or breaks to! Cap and valves be coming from the pressure relief holes on the pressure tank and non pressure.. Hot but not enough to be pushed out of the coolant expansion tank it could be as little as weak. Javascript in your browser before proceeding cap releases the extra coolant the radiator cap be out.

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