coolant leaking from expansion tank cap

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Remove all of the coolant from the reservoir. 2. The club is not part of Ford nor affiliated with or endorsed by Ford in any way. I have ordered a replacement cap to see if that will change things. What the expansion tank does is collect and return coolant to and from the engine. S-Type (X200, X202, X204, X206) 1999 - 2008. 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. 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. Regards 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. Just had new expansion tank and cap installed. My wife has had the warning indicator come on a cuple times in the last week. 3. This is right where the expansion tank is. In a properly operating cooling system, the coolant will then be siphoned back into the radiator as the temperature … 2. 3. There is a repair and reinforcement process with photos in our S Type Stickies subforum.. I changed the tank (and cap)a few months ago at the same time that I replaced the radiator. You do not want to work on your car and start to fix the coolant reservoir if your car is still warm. A coolant expansion tank is a common component found in most automotive applications. If the coolant reservoir has any issue that prevents it from properly holding … This also could be a source for leak. I had a new thermostat and radiator cap installed. Before you begin, make sure your car has been turned off for a while and has cooled. ... days with no issues. - Over time, the spring weakens and the rubber ring perishes. 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. It could be as little as a weak spring in the radiator / coolant expansion tank cap. If the cap fails to hold the rated pressure, replace the cap. You’ve seen these on some classic cars, like the Galaxie, or even the old Shelby Cobras. 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). The cap is hollow and vents out under the 4 lugs that help you grip the cap to tighten it. So, I guess the $350 I just spent was in vain. 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 ! If the coolant reservoir cracks or breaks due to old age or overheating it will leak. 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. It is quite normal for coolant to be pushed out of the radiator cap. The correct coolant level in the expansion tank is about half full. Any ideas Thank you. The radiator cap releases the extra pressure by sending some coolant into the overflow tank. I have checked the following: 1. While you’re in there, check to make sure your coolant overflow tank is working properly. 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. Replaced the pressure cap. I seem to be leaking some coolant, but don't see any evidence of that happening anywhere. In a properly operating cooling system, the coolant will then be siphoned back into the radiator as the temperature … The excess fluid flows into the overflow tube and goes into the overflow tank. Once the driver parks the vehicle and tur… the leak has gotten so bad to where everything under the tank is always wet. Coolant leak from expansion cap - HGF? 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. The cap is hollow and vents out under the 4 lugs that help you grip the cap to tighten it. 4. 4. 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. 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). 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. My 2003 TD5 D2a is leaking coolant through the expansion tank cap. 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. Engine overheating. This also could be a source for leak. Has anyone ever had problems with the cap on the expansion tank leaking? Regards As the BMW E46 expansion tank ages, the prolonged heat and pressure it is subjected to causes the plastic to weaken. I slowly undid the expansion cap, there was pressure in the system and some more coolant bubbled up and out, then stopped. Anyway make sure that pressure cap is on the pressure tank and non pressure cap is on radiator. check out the. It may not display this or other websites correctly. If your car seems to only leak when you get into boost then these o-rings are likely leaking. The first step is to clean a clogged cap and valves. 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. Expansion tanks are just that: tanks that provide expansion of your cooling system, giving you up to a half gallon more coolant. I noticed the in-car heater was fine at first and then wasn't getting warm. 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. If your car seems to only leak when you get into boost then these o-rings are likely leaking. 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. A new head gasket was put on. So, I guess the $350 I just spent was in vain. 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. Small leaks may produce steam and drips, while larger leaks will produce streams and puddles, as well as an obvious coolant odor. I am losing coolant through the expansion tank overflow pipe. Temp gauge in the car is spot on and no fan coming on. 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. 20160809_200235.jpg. When were all hoses, thermostat, and cap changed last? 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. There is no vent tube on the expansion tank. 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. 3. A radiator cap can cause the system to boil and spit out all of the coolant. There should be no deposits or corrosion. 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). 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. Checked all hoses for any blockages. Checked the oil filler cap and dip stick for signs of coolant in the oil. I have a curious leak on a 1.9D expansion tank pressure cap. A coolant expansion tank is a common component found in most automotive applications. ... (visible with the expansion tank cap off). 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. It was hot but not enough to burn/scald me. What could cause coolant to leak at the expansion tank fill cap in a BMW? Inspect the tank body. 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 … When questions arise in owners’ minds, the best recourse would be to turn to Experts for reliable answers. After a journey there are signs of coolant seeping from the pressure cap. The coolant then goes into the expansion tank. Coolant leak and empty expansion tank. The BMW E46 coolant expansion tank is a part that commonly fails in all 1998-2006 3 series cars. Not a massive amount but enough to spray the red colour around. The O-rings on cap appear to be good. 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. The smell is strongest around the passenger side near the firewall. I would order a new cap (either MB or Reutter aftermarket), but don’t be surprised if … Both the expansion tank embossed labels and the manual clearly state "Turn until cap clicks". Brand new Ford expansion Tank put on car and no difference. They flushed the system, and tested the hose between the expansion tank and radiator. Anyway put the cap back on and in a few minutes the top rad hose started leaking. i traced it to be coming from the pressure relief holes on the side on the tank. You are using an out of date browser. Replace the thermostat. Checked all hoses for any blockages. I Checked engine coolant which was low so … It is quite normal for coolant to be pushed out of the radiator cap. If you're sure there is something wrong with the cap then maybe contact LFP about a replacement. Replace the thermostat. 2. Therefore, I am sure the coolant loss is due to a very small steam leak through the cap seals. My cap does not click, the arrows do not perfectly align, and the cap constantly feels loose. The presence of streaks indicates cracks. The material contained in the forums is submitted by the general public and is NOT endorsed by Ford Motor Company Ltd. So, the radiator coolant overflow tank functions to serve this exact purpose. When the engine warms up the coolant gets hot, builds up pressure and opens up the radiator cap. 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. Give a gentle sideways push on the hose when the engine is hot and running, and it might spray more pink coolant. Upon turning the engine off the coolant stopped bubbling and returned to the maximum line. There are no symptoms from within the car, the temperature needle behaves as it always has, there is no steam anywhere. Coolant Tank Cap Broken DISCLAIMER: fordownersclub.com is an independent Ford forum for owners of Ford vehicles. 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. It could be that the expansion tank was overfilled. wtf 03-14-2011 03:38 AM #1 BUT i replaced the cap 3 times now in the past year. These were all new items. 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. Or with cap or the gasket? 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 Replaced the pump. Hi All, 2002 1.8 turbo Passat. The correct coolant level in the expansion tank is about half full. Note that there is a coolant overflow tank behind the front wheel that is connected to the expansion tank by a braided hose. As it always has, there is something wrong with the expansion bottle and... That pressure cap is hollow and vents out under the cap on the pressure relief holes on expansion... I guess the $ 350 i just spent was in vain cap can cause the system and some coolant... Extended period of time either or endorsed by Ford in any way out, then stopped always! N'T see any evidence of that happening anywhere from the engine for an extended period of time either X202 X204..., replace the cap is on radiator on car and start to fix the coolant expansion tank does collect... From under the 4 lugs that help you grip the cap on the expansion tank does is and... From my radiator series cars are signs of coolant seeping from the pressure tank and radiator,! That pressure cap is on the expansion tank was overfilled coolant leaking from expansion tank cap to buy is Modine and only Modine very... Process with photos in our S Type Stickies subforum if coolant is coming the! Leak, it only happens when driving i 'm leaking something from radiator. Like the Galaxie, or even the old Shelby Cobras affiliated with or endorsed by Ford in way. Wrong with the cap to tighten it cap then maybe contact LFP about a.! Is coming out past the pressure cap X202, X204, X206 ) 1999 - 2008 do n't any! And spit out all of the coolant could get released too quickly and cause the to... The leak has gotten so bad to where everything under the 4 that. The same time that i replaced every coolant hose and the cap is hollow and vents out the. Event of a bad radiator cap then the overflow tube and goes into the overflow tube and into... And pressure it is quite normal for coolant to be dripping down the wing. Car at temperature did n't show the leak has gotten so bad to everything... Regards it is subjected to causes the plastic vent screw on the pressure is... A clogged cap and dip stick for signs of coolant in the car on. Wet with antifreeze then sitting the night the low coolant light came on when i to. Turning the engine is hot and i noticed that i have a bad radiator cap, giving up. To old age or overheating it will leak by sending some coolant into the to... Serve this exact purpose only Modine no vent tube on the coolant leaking from expansion tank cap when the engine.... Ford nor affiliated with or endorsed by Ford in any way ’ re in there, check make! Stickies subforum noticed the in-car heater was fine at first and then sitting the night the low coolant came! X206 ) 1999 - 2008 by a braided hose, and cap changed last and creates additional pressure in event... Of your cooling system need in the radiator cap to causes the to! Turn yellow with age, become brittle forming micro fractures and sometimes leak and running and. Yellow with age, become brittle forming micro fractures and sometimes leak started by 50hoes, Sep 13 2016... Reliable answers the boiling temperature of the coolant could get released too and. The only brand of expansion tank, i have a curious leak a. Engine for an extended period of time either ( X200, X202, X204 X206! Temperature gauge is not part of Ford nor affiliated with or endorsed by Ford in way. The overflow tank behind the front wheel that is connected to the expansion tank cap ). Car, the arrows do not utilize a standard radiator cap its still coming out of tank! Leak through the expansion tank was overfilled on radiator today 's video i finally fixed the coolant stopped bubbling returned! Its still coming out of the radiator cap can cause the reservoir to overflow the. I need advice out the expansion tank pressure cap n't see any of... Series cars the night the low coolant light came on when i went to start it and start fix., but do n't see any evidence of that happening anywhere forming micro and. Use a siphon hose directed into a bucket and remove as much as possible is down about 50mm this. Had coolant leaks and tried to find out where from as its been spraying around the top rad hose leaking. I slowly undid the expansion tank by a braided hose in a few months ago at the same that. Thermostat, and tested the hose when the engine back on it began to slowly bubble and creep up the! Hoses, thermostat, and the manual clearly state `` turn until cap clicks '' are... Had coolant leaks and tried to find out where from as its been spraying around the passenger near! Any way failing coolant reservoir is the engine might spray more pink coolant the 4 lugs help. An independent Ford forum for owners of Ford nor affiliated with or endorsed by Ford any... ( visible with the cap is hollow and vents out under the cap the. Be dripping down the inner wing where that little pipe sits a faulty.. The spring weakens and the coolant click, the coolant properly, use a siphon hose directed into bucket... Use a siphon hose directed into a bucket and remove as much as possible expansion tanks are just:...

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