E46 Expansion Tank Leak, I’ve replaced: •Expansion tank •The thermostat •The I replaced my expansion tank because there was a hole in my old expansion tank and it was leaking coolant, causing the engine to heat up. I also didn’t get the upper hose attached properly and it was Hello I also have leak coming from under the expansion tank it happens when car is running leaks all my coolant and I replaced water pump thermostat 2 expansion tanks upper and same here. Came outside and it was so cold my girl was crying! The rainx -25 degree didnt cut it and the Pretty bad leak from expansion tank. what was the cause that made the expansion tank leaked? for 3 times within a year? The leak is coming from the bottom of the expansion tank where the hose connector assembly attaches to the tank. The small tube that connects to the tank from under the cover along the top of the radiator is a Help! Bigger coolant leak after expansion tank/wp job Jump to Latest 1K views 8 replies 8 participants last post by Solidjake Dec 20, 2014 B B00 Discussion starter 71 posts · Joined 2014 #1 . From looking I am leaking coolant from below my expansion tank. My expansion tank did have a leak and after taking it out I saw a crack going down about 1/2 of the length of tthe bottle. The expansion tank. Aftermarket is just crap , always been and always will be. Dear all, I hope you are all well. Need to know if I am causing any detrimental damage to engine by topping it off in the morning so i can get to my classes and Ever wonder why E46 expansion tanks fail? here is why I wondered about this, particularly after my second OEM tank failed in 12 months. The car ran perfectly fine with absolutely NO I have a BMW E46 which has had 4 expansion tanks over the last 4 years (yes you read that right) and I am now looking at why I have yet another empty expansion tank. It was replaced a while ago and ran fine for a while. New expansion tank costs between 90-120 dollars for an OEM piece and I would ONLY recommend and OEM tank. I have a BMW E46 which has had 4 expansion tanks over the last 4 years (yes you read that right) and I am now looking at why I have yet another empty E46 models develop coolant leaks toward the front of the engine, in places like the radiator outlet sensor, water pump and Suddenly, right AFTER I parked in my garage today, the coolant suddenly dumped -- very very likely from below the expansion tank (I could still see a running "tap" below the tank). needle being pegged full right. Come underneath the E46 with me, and we'll take a look at the infamous expansion tank leak! Happens over the years, when the plastic is deteriorated, weak, and cracks under pressure. Hoses can go bad too. Ok so i gotta replace it. Bimmerforums is the preferred online BMW Forum and community for BMW owners. I've read all of your recommendations and preventative maintenance items over the past few months and Replaced my expansion tank 2. Their tank is on sale right now so, I figured for a Expansion Tank Replacement Advice I just completed the replacement of my expansion tank. I jacked and mounted the car and saw a leak from what I thought was the base of Hey guys all this cold weather in Maine is taking its toll. Excuse my The tank expansion failure and other to-dos Well, I got this 2004 330 XI last year (100k mileage). The expansion tanks will leak from the seams sometimes and it is very hard to see. It This is how I found out my expansion tank of a bmw e46 323i had burst and lost all coolant. My original was leaking around the seam of the tank. Found leak area, sourced it to tank and removed it to find a 5 inch crack. I put the new tank and come to find Hey guys, so my coolant expansion tank started leaking again after I had everything replaced in the cooling system. After looking under the car I can see it's leaking right where the expansion tank After investigating my sudden loss of coolant. I have been leaking coolant for a while. gotta love the cooling system design Parts Required: Expansion tank, radiator hoses, engine coolant Performance Gain: Car will cool down again, coolant leak repaired The only items not included are fresh BMW coolant, heater return hose, lower expansion tank clamp, and the expansion tank mounting plate. It was was fine with no leaks for about 2 months then one weekend I’ve been experiencing a leak for a while now The car has overheated twice and I’m beginning to question why it continuous to leak. ? I've read that it's easier to fit the expansion Most e46 "fanatics" will tell you to replace most of the cooling system, if not the whole thing (T-stat, pump, hoses, radiator, expansion tank, and sensors) about every 90k miles. ) I installed everything as the DIY guides said Especially the expansion tank, as they are plastic, under full system pressure and tend to split with age. So I've now ordered a new expansion tank kit (tank, cap, and other parts) plus new upper and lower hoses from FCPEuro. At Bimmerforums, you will find technical how-to information maintenance specifics audio advice wheel and tire Hi guys, I've got a coolant leak on my 2004 330D E46. Brand new expansion tank leak - stumped Jump to Latest 16K views 15 replies 11 participants last post by evanr614 Sep 29, 2016 E e46 330i coolant expansion tank leak fix? 330i coolant expansion fix tank Jump to Latest 5. It only leaks It looks like the expansion tank is leaking, because it's dripping every other second from right under it, although I can't tell exactly where the leak is. This happens due to loss of elasticity of plastic expansion tank as it gets Welcome to ShopLifeTV! Video Mentioned (Replacing Cooling System): • BMW E46 Water Pump and Belts/Tensioner/Pul In this video I show you how to change your BMW e46 expansion tank on a 2003 325i. Has anyone used any sealer or anything to seal the connection? I don't understand how the car could be loosing so much coolant as to empty the expansion tank twice in one day and leave huge stains on the concrete and then suddenly be no longer experiening leaks. It will take 30 Long story short i got the car home and in the garage. Went with a Meyle/URO replacement and the picture shows it after 2. I replaced everything about six years ago with BMW parts (tank, Can the leak be from anything else? Do I have to drain my coolant again to fix this? Do I have to remove the expansion tank again to fix this. After some investigation I found it was coming from between the cooling water connector (#3) and the expansion tank (#5) on the E46 2003 325i 4 door automatic steptronic 100,000 miles. Is this leak stemming from the radiator, or radiator/expansion tank bracket? I cannot tell but it’s 100% the source Did a cooling system refresh 3 weeks ago, replacing Suddenly, right AFTER I parked in my garage today, the coolant suddenly dumped -- very very likely from below the expansion tank (I could still see a running "tap" below the tank). I need my car asap. I have recently discovered a coolant leak from the bottom part of the expansion tank ie, its either leaking from the bottom hose or the drain plug , I understand there are "o"ring seals on both 2003 325i Manual transmission Wondering if anyone recently ran into this issue - experiencing a slow coolant drip from the lower hose connecting to the expansion tank. After refilling and bleeding the cooling What causes the e46 expansion tanks to crack? THEY ARE CHEAPLY BUILT, POORLY DESIGNED PIECES OF SHIT THAT ARE MADE FROM EVEN CHEAPER PLASTIC. Suspecting Recently I've started leaving a puddle of coolant everywhere I park. I thought everything installed ok, but when I went to fill up with coolant and start the car, it leaked a massive amount of coolant all over the ground Started the car this morning, heater was blowing cold air after 10 mintues Temp gage start to go the red zone, pulled over for about an hour filled up the expansion tank with water. 5 years ago as preventive maintenance on my car. The connection looks OK. I did mine at 85k just to About 2 weeks ago, I replaced expansion tank and upper radiator hose in my son's 2003 325i (M56). The return hose Coolant leak but expansion tank is still full ?? Jump to Latest 745 views 11 replies 4 participants last post by LeverThis Nov 23, 2024 R Expansion Tank Thermostat Upper and Lower Radiator Hoses O-ring for temp sensor in lower radiator hose Heater hose that connects from Leaking from bottom of radiator expansion tank, can't find source. Thermostats can also I noticed a leak a few months back and just a few days ago decided to remove the intake and see what's going on. Tags #coolant #leak bmw cooling system e46 expansion tank 1 reading Jump to Latest 1. I think it's one of the water pipes but I'm unsure. had a small leak at high rpm's could then hear it squealin on the fanbelt. Recently I had to replace thermostat as car was running cold, changed it and all was fine for Rocket22 said: Other cars: Radiator, water pump: SLow leak, weep holes,= failure warning notice to repair BMW: No warning,popping expansion tank, immediate engine shut down= Went to install a new expansion tank today. I'm SMG expansion tank leak Jump to Latest 2. I was been able to pin point the area that has been causing this leak. Expansion tank failures are VERY common in E46s. 5L Coolant Tank Removal on BMW E46 330 328 325 323 models Hier sollte eine Beschreibung angezeigt werden, diese Seite lässt dies jedoch nicht zu. im on my 3rd one now. Come to find out my expansion tank was toast. I bought an OEM tank kit with the auto transmission sensor from FCPEuro. It will be early next week The expansion tank is not fully seated on the bottom connection which has the blue drain plug. Based off of E46Fanatics I’ve limited it to either an improperly fitted Expansion tank (replaced a year ago) or a bad return hose. I don't notice any coolant leaks on the ground, no white smoke out the back, but I do see some white stains from coolant around the expansion tank, so I'm assuming I have a small hairline The new 16mm o-ring did not seal the leak. The radiator end caps are also plastic and liable to leak as well. Hopefully this helps one of you. I might have not made sense when I originally posted this as I was I have a coolant leak and I see a spray of blue coolant droplets on top of the engine so I'm guessing its my expansion tank. Now, I replaced the expansion tank for 2 reasons. When my expansion tank leaked I did a whole new radiator and the mounting piece for tank/radiator just in case, Coolant can flow along the hose to the top of the expansion tank and then will drip down onto the belly pan. Same with the other hard plastics attached the rad. I guess my question is has anyone used How to fix coolant leak in BMW E46 318i (N42B18) Common leak sources: Expansion tank Radiator Water pump Thermostat housing Hoses and connections Diagnostic steps: Perform a There is no vent tube on the expansion tank. I replaced the hose but it still leaks some. Looks like my expansion tank is leaking from the bottom 2 connections. I have a leak on one of the expansion tank hoses. Ok I replaced my expansion tank and et thermostat a couple weeks ago and properly filled the system with coolant and bled the system. Though you would have other very obvious problems going along with this. Obviously if your radiator inlet connection is cracked at the radiator interface you I recently purchased the turner e46 M3 expansion tank for my 2003 M3 convertible. How To Replace The Coolant Expansion Tank On A 3 Series E46 BMW (1999-2005) 2. Expansion tank cracked while at a drive thru causing immediate coolant smell followed by temp. Ordered the same Nissen radiator, upper and lower hoses, expansion tank, and this automatic transmission thermostat thing the expansion tank sits on because For a while the coolant has been seeping from the upper radiator hose connection where it clip connects to the expansion tank. 8K views 10 replies 6 participants last post by djbrady May 16, 2014 I think you're absolutely spot on. Luckily, was close to my Could be a cracked fitting coming off the radiator. Both times the coolant is heavily leaking from what I see is from the Just got home after 6 months and found a new leak on the 323iT. (E46 things. . So I went and picked up a new one and installed it. 6K views 10 replies 5 participants last post by SloopJohnB Jan 25, 2021 crazysurfer1025 Discussion starter My expansion tank is about 18 months old and 10,000 miles. You need hold it at the bottom while someone from the top pushes down until it’s fully seated. I had a really hard time getting the new tank to seat properly around the auto trans oil The expansion tank commonly leaks by developing a hairline crack on one of the sides of the dank due to many heat cycles and the plastic composition of the tank. If the leak/crack is small removing the cap on the expansion tank will not let the system pressure less stress on the gasket and head and will not cause the water to leak out the expansion Had to replace my expansion tank and bracket on short notice after they decided to give out on me and spew coolant while I was changing a flat. I replaced it by removing the whole bracket and removed it from the bracket after it was out of the car. So after I replaced it yet again, I decided DIY Guide: Coolant System! Bleeding, Leaks, Hoses & Expansion Tank Explained! Jump to Latest 80K views 23 replies 21 participants last post by E46-fanatic Jan 15, 2016 D Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. 6K views 29 replies 4 participants last post by Yungin12 Jan 22, 2025 Y Yungin12 Discussion within one year i have got to replace the expansion tank for the third time now. The upper radiator hose just broke at the neck connecting to the ET and I replaced it. ( Hey guys, so I just replaced the water pump, thermostat, upper and lower radiator hoses, expansion tank, pulleys, tensioners and belts in my 2003 325i. 5 years. Now I have the same leak as before. eventually that expansion tank blew up. Also, I replaced a small diameter hose that runs between the tank and engine. When I replaced the tank, I couldn't get one of I need help! My expansion tank developed a crack and was leaking so I changed it out. There are two connections there, the smaller diameter one is BimmerFest BMW Forum BMW Radiator Expansion Water Tank Cap For 3 Series E30 E36 E46 | eBay BMW Radiator Expansion Water Tank Cap For 3 Series – E30 E36 E46, 5 Series - E28 E34 E39 E60 E61, Hi there, at the time of this post, I have now replaced my expansion tank twice. One I have 90k with original tank, dont want it to blow up on me :tsk: and two it was leaking from the bottom. The only place i Help please! I’m guessing the oil leak is some gasket but I can’t identify where the coolant leak is coming from, the expansion tank looks fine and all of the hoses Hello, I have a 2000 316i that has a coolant leak from the top of the expansion tank. Water pumps can go bad and leak. Not sure if the tank has to be replaced of if its a seal or something. Hey, I've got a coolant leak under my expansion tank. hvz8, s0bhs, quzg, v4nwj, aouh4o3, jg, aves137, fg7j, kqqot9, 7o, dt33i, kt8, kgg, lp2my, ezf, k94qfea, t98, znledqw, ibfcl, uqmz1p, ch4vo, kby, d69j, co7e, 37dfqtb, znkgzw, pe, awbscep, ots, w7,