Anyway put the cap back on and in a few minutes the top rad hose started leaking. 04 cobra overheating and leaking coolant out of expansion tank cap Discussion in 'Terminator Talk' started by 50hoes, Sep 13, 2016. check out the. the leak has gotten so bad to where everything under the tank is always wet. They continue to leak but now we find it´s from expansion tank cap. So i fired up the Ryker on the way back from work and noticed a strange low almost hissing noise. Hey guys so in today's video I finally fixed the coolant leak on my car! Note that there is a coolant overflow tank behind the front wheel that is connected to the expansion tank by a braided hose. Just had new expansion tank and cap installed. its still coming out past the pressure relief valve in the cap i guess. There are no symptoms from within the car, the temperature needle behaves as it always has, there is no steam anywhere. 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). The BMW E46 coolant expansion tank is a part that commonly fails in all 1998-2006 3 series cars. 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. Coolant Tank Cap Broken DISCLAIMER: fordownersclub.com is an independent Ford forum for owners of Ford vehicles. So, the radiator coolant overflow tank functions to serve this exact purpose. A coolant reservoir is a dual-purpose component. I Checked engine coolant which was low so … 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). 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. Give a gentle sideways push on the hose when the engine is hot and running, and it might spray more pink coolant. Note that there is a coolant overflow tank behind the front wheel that is connected to the expansion tank by a braided hose. The car seems on occasion to feel very hot and I noticed that I have a leak from the new expansion tank. I have a curious leak on a 1.9D expansion tank pressure cap. I am losing coolant through the expansion tank overflow pipe. S-Type (X200, X202, X204, X206) 1999 - 2008. 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. The only brand of expansion tank and cap to buy is Modine and only Modine! Therefore, I am sure the coolant loss is due to a very small steam leak through the cap seals. If your car seems to only leak when you get into boost then these o-rings are likely leaking. temp is always reading normal when warmed up. When were all hoses, thermostat, and cap changed last? I would order a new cap (either MB or Reutter aftermarket), but don’t be surprised if … Inspect the expansion tank cap. Engine overheating. Has anyone had issues with their coolant expansion tank leaking? but this has me completely confused. Once the driver parks the vehicle and tur… Coolant escaping from under the cap on the expansion tank, I need advice. After a 5 hour drive and then sitting the night the low coolant light came on when I went to start it. There is a repair and reinforcement process with photos in our S Type Stickies subforum.. JavaScript is disabled. Brand new Ford expansion Tank put on car and no difference. This also could be a source for leak. I bought a Nissan X-Trail 2.2 diesel yesterday. - Coolant system is pressurised, this raises the boiling temperature of the coolant. Checked all hoses for any blockages. If coolant is coming out of the Reservoir fill cap then the Overflow piping is plugged. The braised hose also gets brittle. If the coolant reservoir cracks or breaks due to old age or overheating it will leak. Coolant escaping from under the cap on the expansion tank, I need advice. 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 material contained in the forums is submitted by the general public and is NOT endorsed by Ford Motor Company Ltd. Expansion tanks are just that: tanks that provide expansion of your cooling system, giving you up to a half gallon more coolant. Replaced the pressure cap. Under the bonnet, with the expansion tank cap on, water drips out of the overflow pipe, take the cap … The first step is to clean a clogged cap and valves. Change the coolant cap. I slowly undid the expansion cap, there was pressure in the system and some more coolant bubbled up and out, then stopped. Replaced the pump. 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. Honest John Ask Honest John » Coolant loss through expansion tank. 2. Remove all of the coolant from the reservoir. 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). 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. It may not display this or other websites correctly. 4. 3. The excess fluid flows into the overflow tube and goes into the overflow tank. There is no vent tube on the expansion tank. - Over time, the spring weakens and the rubber ring perishes. Or with cap or the gasket? After a journey there are signs of coolant seeping from the pressure cap. After a journey there are signs of coolant seeping from the pressure cap. I have checked the following: 1. Checked all hoses for any blockages. 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. 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. Coolant goes into the reservoir tank as it expands. A coolant expansion tank is a common component found in most automotive applications. I have a curious leak on a 1.9D expansion tank pressure cap. Please help. My cap does not click, the arrows do not perfectly align, and the cap constantly feels loose. 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. It provides the extra coolant the radiator and cooling system need in the event of a leak and prevents overheating. The correct coolant level in the expansion tank is about half full. It could be as little as a weak spring in the radiator / coolant expansion tank cap. The cap is hollow and vents out under the 4 lugs that help you grip the cap to tighten it. My 2003 TD5 D2a is leaking coolant through the expansion tank cap. Change the coolant cap. I have ordered a replacement cap to see if that will change things. 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. If you're sure there is something wrong with the cap then maybe contact LFP about a replacement. This also could be a source for leak. ... days with no issues. 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. When the engine warms up the coolant gets hot, builds up pressure and opens up the radiator cap. 2. 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 leak from expansion cap - HGF? Water blowing out expansion tank cap ! 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). 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. 4. Over time, the coolant expansion tank tends to turn yellow with age, become brittle forming micro fractures and sometimes leak. I noticed the in-car heater was fine at first and then wasn't getting warm. Regards Remember to make sure your work area is clean and protected. Replace the coolant temperature sensor. 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. It could be that the expansion tank was overfilled. 4.Check and change fuses and relays for coolant … Meanwhile, the coolant expands and creates additional pressure in the radiator. Both the expansion tank embossed labels and the manual clearly state "Turn until cap clicks". Has anyone ever had problems with the cap on the expansion tank leaking? 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. As the BMW E46 expansion tank ages, the prolonged heat and pressure it is subjected to causes the plastic to weaken. Replaced the pressure cap. If the cap fails to hold the rated pressure, replace the cap. 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