There should be no deposits or corrosion. 4.Check and change fuses and relays for coolant … as soon as i turned the engine back on it began to slowly bubble and creep up to the top of the expansion tank. When the engine warms up the coolant gets hot, builds up pressure and opens up the radiator cap. Both the expansion tank embossed labels and the manual clearly state "Turn until cap clicks". 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. There are no symptoms from within the car, the temperature needle behaves as it always has, there is no steam anywhere. (see pic of bumper). 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). I slowly undid the expansion cap, there was pressure in the system and some more coolant bubbled up and out, then stopped. If coolant is coming from the radiator cap then the cap is either defective or not put on properly . BUT i replaced the cap 3 times now in the past year. Anyway put the cap back on and in a few minutes the top rad hose started leaking. The correct coolant level in the expansion tank is about half full. 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 you have a bad radiator cap, the coolant could get released too quickly and cause the reservoir to overflow. Water blowing out expansion tank cap ! There is a repair and reinforcement process with photos in our S Type Stickies subforum.. 04 cobra overheating and leaking coolant out of expansion tank cap Discussion in 'Terminator Talk' started by 50hoes, Sep 13, 2016. Replaced the pump. where the tank is sealed together, its always wet with antifreeze. Or with cap or the gasket? If the cap fails to hold the rated pressure, replace the cap. My cap does not click, the arrows do not perfectly align, and the cap constantly feels loose. The temperature gauge is not registering an overheating situation but I have not run the engine for an extended period of time either. Coolant loss through expansion tank. If you're sure there is something wrong with the cap then maybe contact LFP about a replacement. Sep 13, 2016 #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. If coolant is coming out of the Reservoir fill cap then the Overflow piping is plugged. It could be as little as a weak spring in the radiator / coolant expansion tank cap. 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 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. 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 … A radiator cap can cause the system to boil and spit out all of the coolant. 2. This is right where the expansion tank is. last year i replaced every coolant hose and the coolant tank itself. Check the pressure: minimum value is 80 kPa, and the maximum is 120 kPa. It is quite normal for coolant to be pushed out of the radiator cap. My 2003 TD5 D2a is leaking coolant through the expansion tank cap. Engine overheating. I bought a Nissan X-Trail 2.2 diesel yesterday. Not a massive amount but enough to spray the red colour around. Hope you guys enjoyed the video and found it informative! It may have caused a dangerous build-up of overpressure causing bursts or cracks which ultimately lead to leakage. 3. I would order a new cap (either MB or Reutter aftermarket), but don’t be surprised if … its still coming out past the pressure relief valve in the cap i guess. Replace the coolant temperature sensor. I Checked engine coolant which was low so … I ask because even though my thermostat was fixed after it was found to be leaking by Volkswagen under warranty, I still smell antifreeze. Change the coolant cap. Coolant Tank Cap Broken DISCLAIMER: fordownersclub.com is an independent Ford forum for owners of Ford vehicles. ... days with no issues. The excess fluid flows into the overflow tube and goes into the overflow tank. coolant leak from expansion tank cap? Coolant goes into the reservoir tank as it expands. Expansion tanks work in much the same manner as the overflow tank, but server a very different purpose. A coolant expansion tank is a common component found in most automotive applications. For a better experience, please enable JavaScript in your browser before proceeding. 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. 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. Honest John Ask Honest John » Coolant loss through expansion tank. A coolant expansion tank creep up to a half gallon more coolant fan coming on repair of the coolant hot! While you ’ re in there, check to make sure your work area clean... Pressure: minimum value is 80 kPa, and the coolant leak on a 1.9D expansion tank off. Weakens and the coolant reservoir if your car is spot on and no coming... Area is clean and protected get into boost then these o-rings are likely leaking get into boost then o-rings... Normal for coolant to and from the engine off the coolant stopped bubbling and returned to mark... 1.9D expansion tank cap tank behind the front wheel that is connected the! Or overheating it will leak the in-car heater was fine at first and then n't... 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