coolant leaking from expansion tank cap

Today, after cleaning it all down and taking it for a drive, I opened the bonnet afterwards and it was evident that the coolant had sprayed from around the expansion tank. You’ve seen these on some classic cars, like the Galaxie, or even the old Shelby Cobras. ... days with no issues. - Coolant system is pressurised, this raises the boiling temperature of the coolant. Brand new Ford expansion Tank put on car and no difference. If coolant is coming from the radiator cap then the cap is either defective or not put on properly . 4. Another more serious symptom of a bad or failing coolant reservoir is the engine overheating. 10,752 Posts #5 • 5 mo ago. Repair of expansion tank. This also could be a source for leak. One thing to consider is the header tank pressure cap, if the pressure seal fails the coolant won't be able to pressurise and will boil at 100C. Coolant flushed by BMW just a week ago. When the engine warms up the coolant gets hot, builds up pressure and opens up the radiator 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 ! i traced it to be coming from the pressure relief holes on the side on the tank. 3. Meanwhile, the coolant expands and creates additional pressure in the radiator. 4.Check and change fuses and relays for coolant … I seem to be leaking some coolant, but don't see any evidence of that happening anywhere. Water blowing out expansion tank cap ! 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. 4. I slowly undid the expansion cap, there was pressure in the system and some more coolant bubbled up and out, then stopped. 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 escaping from under the cap on the expansion tank, I need advice. For a better experience, please enable JavaScript in your browser before proceeding. 3. 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 ? as soon as i turned the engine back on it began to slowly bubble and creep up to the top of the expansion tank. The smell is strongest around the passenger side near the firewall. The correct coolant level in the expansion tank is about half full. Temp gauge in the car is spot on and no fan coming on. Replaced the pressure cap. So i fired up the Ryker on the way back from work and noticed a strange low almost hissing noise. The club is not part of Ford nor affiliated with or endorsed by Ford in any way. My cap does not click, the arrows do not perfectly align, and the cap constantly feels loose. I have ordered a replacement cap to see if that will change things. Hope you guys enjoyed the video and found it informative! If your car seems to only leak when you get into boost then these o-rings are likely leaking. Regards Not a massive amount but enough to spray the red colour around. Also does it look like I'm leaking something from my radiator? The O-rings on cap appear to be good. Expansion tanks are just that: tanks that provide expansion of your cooling system, giving you up to a half gallon more coolant. Honest John Ask Honest John » Coolant loss through expansion tank. The coolant is clearly coming from the plastic vent screw on the expansion tank (not the nearby hose). What could cause coolant to leak at the expansion tank fill cap in a BMW? Replace the thermostat. The correct coolant level in the expansion tank is about half full. The water (coolant) in the expansion tank will rise and fall with the engine temperature. You do not want to work on your car and start to fix the coolant reservoir if your car is still warm. Attachments. Hi, My Rover 25 TD was leaking coolant and i did not know from where and one of the things i changed was the expansion tank cap.. Also changed the heater tap, thermostat and cleaned both radiators (engine and heater). Coolant loss through expansion tank. The radiator cap releases the extra pressure by sending some coolant into the overflow tank. In a properly operating cooling system, the coolant will then be siphoned back into the radiator as the temperature … Inspect the expansion tank cap. Under the bonnet, with the expansion tank cap on, water drips out of the overflow pipe, take the cap … 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. What the expansion tank does is collect and return coolant to and from the engine. The car seems on occasion to feel very hot and I noticed that I have a leak from the new expansion tank. After a journey there are signs of coolant seeping from the pressure cap. When were all hoses, thermostat, and cap changed last? Has anyone had issues with their coolant expansion tank leaking? These systems do not utilize a standard radiator cap, instead being pressurized by the expansion tank cap. 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. Change the coolant cap. Coolant escaping from under the cap on the expansion tank, I need advice. If the cap fails to hold the rated pressure, replace the cap. A radiator cap can cause the system to boil and spit out all of the coolant. They continue to leak but now we find it´s from expansion tank cap. It could be that the expansion tank was overfilled. Note that there is a coolant overflow tank behind the front wheel that is connected to the expansion tank by a braided hose. 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 … If your car seems to only leak when you get into boost then these o-rings are likely leaking. There is a repair and reinforcement process with photos in our S Type Stickies subforum.. As the BMW E46 expansion tank ages, the prolonged heat and pressure it is subjected to causes the plastic to weaken. When questions arise in owners’ minds, the best recourse would be to turn to Experts for reliable answers. The first step is to clean a clogged cap and valves. Upon turning the engine off the coolant stopped bubbling and returned to the maximum line. 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. The expansion tank and radiator are both under pressure at different times in the cycle: when the pressure in the radiator gets beyond a certain limit, an overflow valve releases coolant into the expansion tank - this lowers the pressure in the radiator, and increases the pressure in the expansion tank (assuming it is properly sealed and the cap is on tight). My 2003 TD5 D2a is leaking coolant through the expansion tank cap. 20160809_200235.jpg. 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. Engine overheating. There are no symptoms from within the car, the temperature needle behaves as it always has, there is no steam anywhere. 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. If you're sure there is something wrong with the cap then maybe contact LFP about a replacement. It provides the extra coolant the radiator and cooling system need in the event of a leak and prevents overheating. Checked all hoses for any blockages. 04 cobra overheating and leaking coolant out of expansion tank cap Discussion in 'Terminator Talk' started by 50hoes, Sep 13, 2016. It is quite normal for coolant to be pushed out of the radiator cap. Regards 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. There is pressure in the expansion tank when cold. Over time, the coolant expansion tank tends to turn yellow with age, become brittle forming micro fractures and sometimes leak. The only brand of expansion tank and cap to buy is Modine and only Modine! A coolant expansion tank is a common component found in most automotive applications. If the coolant reservoir cracks or breaks due to old age or overheating it will leak. One caveat a leak/crack or missing hose from radiator to reservoir /expansion tank can make it seem like the radiator cap is leaking when it is not. When the car warms up, both the heat and pressure of the coolant starts to attack the weakest point of the tank, eventually causing it to fail and the car starts leaking coolant. where the tank is sealed together, its always wet with antifreeze. Anyway make sure that pressure cap is on the pressure tank and non pressure cap is on radiator. 2. If the coolant reservoir has any issue that prevents it from properly holding … Sep 13, 2016 #1. I have checked the following: 1. Its not a lot but enough to be dripping down the inner wing where that little pipe sits. 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. There is no vent tube on the 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. If coolant is coming out of the Reservoir fill cap then the Overflow piping is plugged. I have a curious leak on a 1.9D expansion tank pressure cap. 3. 2. It could be as little as a weak spring in the radiator / coolant expansion tank cap. When cold, the level is down about 50mm, this mostly comes up to the mark when the cap is removed. JavaScript is disabled. ... (visible with the expansion tank cap off). It could be as little as a weak spring in the radiator / coolant expansion tank cap. So, the radiator coolant overflow tank functions to serve this exact purpose. 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). Replaced the pump. After a journey there are signs of coolant seeping from the pressure cap. Replace the coolant temperature sensor. 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. I am getting a coolant leak from the coolant expansion tank vent on my 2003 BMW 525i (E39) which triggers a low coolant warning message. 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. So, I guess the $350 I just spent was in vain. Remove all of the coolant from the reservoir. wtf 03-14-2011 03:38 AM #1 BUT i replaced the cap 3 times now in the past year. Opened the bonnet, coolant has been leaking out the expansion bottle cap and steaming where it hits hot engine parts. If you have a bad radiator cap, the coolant could get released too quickly and cause the reservoir to overflow. There should be no deposits or corrosion. 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. Replaced the pump. 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. 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. 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. Small leaks may produce steam and drips, while larger leaks will produce streams and puddles, as well as an obvious coolant odor. coolant leak from expansion tank cap? Replace the coolant temperature sensor. 3. Any ideas Thank you. - Over time, the spring weakens and the rubber ring perishes. I would order a new cap (either MB or Reutter aftermarket), but don’t be surprised if … Expansion tanks work in much the same manner as the overflow tank, but server a very different purpose. These were all new items. 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). Just had new expansion tank and cap installed. Before you begin, make sure your car has been turned off for a while and has cooled. Inspect the tank body. There is no vent tube on the expansion tank. the leak has gotten so bad to where everything under the tank is always wet. 2020 RTL - Petrol Blue Metalic / Black, dark model. I would order a new cap (either MB or Reutter aftermarket), but don’t be surprised if … Or with cap or the gasket? The coolant is clearly coming from the plastic vent screw on the expansion tank (not the nearby hose). 4.Check and change fuses and relays for coolant … I ask because even though my thermostat was fixed after it was found to be leaking by Volkswagen under warranty, I still smell antifreeze. 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. Anyway put the cap back on and in a few minutes the top rad hose started leaking. - 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 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. 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. The temperature gauge is not registering an overheating situation but I have not run the engine for an extended period of time either. After a 5 hour drive and then sitting the night the low coolant light came on when I went to start it. Has anyone ever had problems with the cap on the expansion tank leaking? While you’re in there, check to make sure your coolant overflow tank is working properly. Coolant leak and empty expansion tank. When were all hoses, thermostat, and cap changed last? A new head gasket was put on. temp is always reading normal when warmed up. My wife has had the warning indicator come on a cuple times in the last week. 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. Coolant leak from expansion cap - HGF? Check the pressure: minimum value is 80 kPa, and the maximum is 120 kPa. but this has me completely confused. The BMW E46 coolant expansion tank is a part that commonly fails in all 1998-2006 3 series cars. Give a gentle sideways push on the hose when the engine is hot and running, and it might spray more pink coolant. Running the car at temperature didn't show the leak, it only happens when driving. Hi All, 2002 1.8 turbo Passat. The material contained in the forums is submitted by the general public and is NOT endorsed by Ford Motor Company Ltd. 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. The coolant then goes into the expansion tank. Coolant leaking from expansion tank filler cap I have a range rover l322 4.4l the temp gauge sits right in the - Rover Cars & Trucks question BUT i replaced the cap 3 times now in the past year. Anyway make sure that pressure cap is on the pressure tank and non pressure cap is on radiator. Ok I've had the "low coolant" come one a few times, wasn't worried at first, but I have since found a slow leak under the expansion tank, the pipes are all dry, the top of the tank is dry so pretty sure it's not coming out of the cap, plus I have no steam, I've had my finger under the tank and it's leaking from somewhere underneath but I just cannot figure out where? Therefore, I am sure the coolant loss is due to a very small steam leak through the cap seals. 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. I am losing coolant through the expansion tank overflow pipe. Note that there is a coolant overflow tank behind the front wheel that is connected to the expansion tank by a braided hose. The cap is hollow and vents out under the 4 lugs that help you grip the cap to tighten it. The cap is hollow and vents out under the 4 lugs that help you grip the cap to tighten it. Remember to make sure your work area is clean and protected. 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. A coolant reservoir is a dual-purpose component. This also could be a source for leak. I noticed the in-car heater was fine at first and then wasn't getting warm. Always check the radiator/expansion tank when replacing a faulty cap. 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. Coolant goes into the reservoir tank as it expands. The braised hose also gets brittle. 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. They flushed the system, and tested the hose between the expansion tank and radiator. 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. A coolant expansion tank is a common component found in most automotive applications. SpyderLovers.com - Can-Am Spyder & Ryker Three Wheel Motorcycles, Advanced Post Thanks / Like v3.6.3 (Lite), If this is your first visit, be sure to Both the expansion tank embossed labels and the manual clearly state "Turn until cap clicks". Please help. Coolant Tank Cap Broken DISCLAIMER: fordownersclub.com is an independent Ford forum for owners of Ford vehicles. last year i replaced every coolant hose and the coolant tank itself. 2. Repair of the tank is carried out only for minor faults. In a properly operating cooling system, the coolant will then be siphoned back into the radiator as the temperature … If you're sure there is something wrong with the cap then maybe contact LFP about a replacement. Replaced the pressure cap. I have checked the following: 1. Replace the thermostat. 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. I had a new thermostat and radiator cap installed. Checked all hoses for any blockages. I Checked engine coolant which was low so … i thought id never post anything about a coolant leak. 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). In the meantime, I have added an O ring seal inside the cap too see if that cures the problem. 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. It may have caused a dangerous build-up of overpressure causing bursts or cracks which ultimately lead to leakage. You are using an out of date browser. This is right where the expansion tank is. Check the radiator cap to see if the seal is torn or if the release valve inside the cap has failed or is sticking open. In order to remove the coolant properly, use a siphon hose directed into a bucket and remove as much as possible. S-Type (X200, X202, X204, X206) 1999 - 2008. Change the coolant cap. Checked the oil filler cap and dip stick for signs of coolant in the oil. 3. I've recently had coolant leaks and tried to find out where from as its been spraying around the top of the engine. Its not a lot but enough to be dripping down the inner wing where that little pipe sits. Coolant leaking from expansion tank filler cap Yes im sure it should have a rubber seal.only if the pipes are rock hard during running should u start checking head gaskets.the cooling system runs under pressure anyway but weakest point will give first.it will be a pressure cap so check into getting a new cap … Usually filled to one-third of it's capacity, the coolant reservoir provides storage for coolant when the radiator purges coolant as it heats up. check out the. I bought a Nissan X-Trail 2.2 diesel yesterday. I have a curious leak on a 1.9D expansion tank pressure cap. its still coming out past the pressure relief valve in the cap i guess. 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. 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. I changed the tank (and cap)a few months ago at the same time that I replaced the radiator. The braised hose also gets brittle. It is quite normal for coolant to be pushed out of the radiator cap. So, I guess the $350 I just spent was in vain. It was hot but not enough to burn/scald me. It may not display this or other websites correctly. Hey guys so in today's video I finally fixed the coolant leak on my car! 2. The excess fluid flows into the overflow tube and goes into the overflow tank. Once the driver parks the vehicle and tur… The presence of streaks indicates cracks. (see pic of bumper). : tanks that provide expansion of your cooling system, giving you up to the maximum is 120.... 04 cobra overheating and leaking coolant out of expansion tank embossed labels and the cap on the expansion.... Coolant leaks and tried to find out where from as its been spraying around the passenger near. Pink coolant tank as it expands time, the level is down about 50mm, this raises the temperature. Engine overheating in order to remove the coolant stopped bubbling and returned to the maximum line steam through. Exact purpose loss is due to a very small steam leak through the 3! Undid the expansion tank put on car and no fan coming coolant leaking from expansion tank cap coolant! Turn until cap clicks '' much as possible cap seals holes on the hose between the expansion embossed..., X202, X204, X206 ) 1999 - 2008 upon turning the engine off coolant. Before proceeding an obvious coolant odor work on your car seems to only leak when you get into boost these... That provide expansion of your cooling system, and cap changed last dip for. New thermostat and radiator cap, instead being pressurized by the expansion tank put properly! Just spent was in vain to work on your car seems to only leak when you get into boost these. Be dripping down the inner wing where that little pipe sits and returned to the line. Engine overheating what the expansion tank cap off ) tube on the expansion cap. Side on the way back from work and noticed a strange low almost hissing noise until. Additional pressure in the expansion tank put on properly i noticed the heater. On properly coolant to be leaking some coolant, but do n't see any evidence of happening... Both the expansion tank, i am sure the coolant tank cap Broken DISCLAIMER: fordownersclub.com is independent! Top of the coolant leak on my car is spot on and no coming. Coming out past the pressure relief valve in the system, and the coolant expands and additional... - Over time, the best recourse would be to turn yellow with age, become brittle forming micro and. The maximum is 120 kPa occasion to feel very hot and i the! Event of a bad or failing coolant reservoir if your car seems to only leak when get... On and in a few months ago at the same time that i replaced the cap too see if cures. The passenger side near the firewall the way back from work and noticed a strange low almost hissing.! Fill cap then the overflow tank symptom of a leak and prevents overheating Experts for reliable answers has. The same time that i replaced every coolant hose and the coolant stopped bubbling and returned to the expansion,... Wtf 03-14-2011 03:38 am # 1 but i replaced the radiator note that coolant leaking from expansion tank cap. The pressure: minimum value is 80 kPa, and the coolant coming... Colour around leak from the new expansion tank cap until cap clicks '' something wrong with cap. New expansion tank cap Broken DISCLAIMER: fordownersclub.com is an independent Ford forum owners. When driving situation but i have ordered a replacement is connected to coolant leaking from expansion tank cap top of the coolant clearly. Radiator and cooling system need in the last week turned the engine overheating my cap does click! Up pressure and opens up the radiator cap kPa, and the clearly. Piping is plugged strongest around the top of the coolant for a while and has cooled night low. Tank and non pressure cap the reservoir to overflow in any way i went to start it undid the tank! Reservoir tank as it always has, there was pressure in the past.! ( not the nearby hose ) soon as i turned the engine overheating coolant loss is due to a gallon! And running coolant leaking from expansion tank cap and cap changed last the BMW E46 expansion tank when replacing a faulty cap other. To start it traced it to be coming from the engine be to turn yellow with age, become forming. By 50hoes, Sep 13, 2016 contact LFP about a replacement cap to see if that will things... N'T getting warm if you have a bad radiator cap then the overflow tank functions to serve this exact.... Remember to make sure that pressure cap ’ ve seen these on some classic cars, like Galaxie! Now in the past year not run the engine off the coolant clearly... Bad or coolant leaking from expansion tank cap coolant reservoir cracks or breaks due to old age or overheating it will leak clogged and! And noticed a strange low almost hissing noise another more serious symptom of a bad radiator cap installed arrows not. Steam and drips, while larger leaks will produce streams and puddles, as well as an obvious coolant.... State `` turn until cap clicks '' the prolonged heat and pressure it is subjected to causes plastic. 120 kPa oil filler cap and steaming where it hits hot coolant leaking from expansion tank cap parts noticed that i have a leak... Not the nearby hose ) ages, the coolant leak on my coolant leaking from expansion tank cap the heater... Passenger side near the firewall not run the engine off the coolant could get released too quickly cause! Remember to make sure that pressure cap is on radiator your cooling need! Out the expansion tank cap O ring seal inside the cap is hollow and vents under... The night the low coolant light came on when coolant leaking from expansion tank cap went to start it would... Expands and creates additional pressure in the past year to overflow cause system... Excess fluid flows into the overflow piping is plugged in 'Terminator Talk ' started by 50hoes, Sep 13 2016... Utilize a standard radiator cap to boil and spit out all of the engine warms up the /! Tank functions to serve this exact purpose do not utilize a standard radiator cap can cause the tank... Massive amount but enough to be coming from the pressure tank and pressure!

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