Expansion tank leaking - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
![BMW E46 Cooling System Leak Test | BMW 325i (2001-2005), BMW 325Xi (2001-2005), BMW 325Ci (2001-2006), BMW 325ti (2001-2004) | Pelican Parts Technical Article BMW E46 Cooling System Leak Test | BMW 325i (2001-2005), BMW 325Xi (2001-2005), BMW 325Ci (2001-2006), BMW 325ti (2001-2004) | Pelican Parts Technical Article](https://cdn4.pelicanparts.com/BMW/techarticles/BMW-3-Series-E46/111-WATER-Cooling_System_Leak_Test/images_large/pic03.jpg)
BMW E46 Cooling System Leak Test | BMW 325i (2001-2005), BMW 325Xi (2001-2005), BMW 325Ci (2001-2006), BMW 325ti (2001-2004) | Pelican Parts Technical Article
![Determining root cause for cracked BMW coolant reservoir? - Motor Vehicle Maintenance & Repair Stack Exchange Determining root cause for cracked BMW coolant reservoir? - Motor Vehicle Maintenance & Repair Stack Exchange](https://i.stack.imgur.com/sACRi.jpg)
Determining root cause for cracked BMW coolant reservoir? - Motor Vehicle Maintenance & Repair Stack Exchange
![Amazon.com: Coolant Recovery Reservoir Expansion Tank with Cap and Sensor Replacement for BMW X3 X5 320i 325i 328i 330i : Automotive Amazon.com: Coolant Recovery Reservoir Expansion Tank with Cap and Sensor Replacement for BMW X3 X5 320i 325i 328i 330i : Automotive](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/61ha40eMkCS._AC_UF894,1000_QL80_.jpg)
Amazon.com: Coolant Recovery Reservoir Expansion Tank with Cap and Sensor Replacement for BMW X3 X5 320i 325i 328i 330i : Automotive
![Coolant Recovery Reservoir Expansion Tank with Cap and Sensor Replacement for BMW X3 X5 320i 325i 328i 330i : Automotive - Amazon.com Coolant Recovery Reservoir Expansion Tank with Cap and Sensor Replacement for BMW X3 X5 320i 325i 328i 330i : Automotive - Amazon.com](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/61-SVFLm34S._AC_UF350,350_QL50_.jpg)
Coolant Recovery Reservoir Expansion Tank with Cap and Sensor Replacement for BMW X3 X5 320i 325i 328i 330i : Automotive - Amazon.com
![Why is it steaming and how do I fix it? Just changed expansion tank and radiator in my 2000 E46 323ci. : r/BmwTech Why is it steaming and how do I fix it? Just changed expansion tank and radiator in my 2000 E46 323ci. : r/BmwTech](https://preview.redd.it/why-is-it-steaming-and-how-do-i-fix-it-just-changed-v0-jw1i24umn7la1.jpg?auto=webp&s=e51a422816ec9d995087553ef61ca82a1d5739ea)
Why is it steaming and how do I fix it? Just changed expansion tank and radiator in my 2000 E46 323ci. : r/BmwTech
![Coolant leak from the top of my expansion tank. I think it's the cap. Is this a common issue? What could fail on this part? - BMW E46 318i M43TUB19 1998 : r/MechanicAdvice Coolant leak from the top of my expansion tank. I think it's the cap. Is this a common issue? What could fail on this part? - BMW E46 318i M43TUB19 1998 : r/MechanicAdvice](https://preview.redd.it/fh3225fm3re71.jpg?width=640&crop=smart&auto=webp&s=f93c19ac7597aea0a31a3c072c9b44a376484359)
Coolant leak from the top of my expansion tank. I think it's the cap. Is this a common issue? What could fail on this part? - BMW E46 318i M43TUB19 1998 : r/MechanicAdvice
![BMW E46 Coolant Expansion Tank Replacement - BMW 325i (2001-2005), BMW 325Xi (2001-2005), BMW 325Ci (2001-2006), BMW 325ti (2001-2004) | Pelican Parts Technical Article BMW E46 Coolant Expansion Tank Replacement - BMW 325i (2001-2005), BMW 325Xi (2001-2005), BMW 325Ci (2001-2006), BMW 325ti (2001-2004) | Pelican Parts Technical Article](https://cdn4.pelicanparts.com/BMW/techarticles/BMW-3-Series-E46/33-WATER-Coolant_Expansion_Tank_Replacement/images_large/pic06.jpg)
BMW E46 Coolant Expansion Tank Replacement - BMW 325i (2001-2005), BMW 325Xi (2001-2005), BMW 325Ci (2001-2006), BMW 325ti (2001-2004) | Pelican Parts Technical Article
![Coolant leak: can not pinpoint where the leak is from, is it the expansion tank or something with the radiator? Car is losing coolant slowly and I can see drops of coolant Coolant leak: can not pinpoint where the leak is from, is it the expansion tank or something with the radiator? Car is losing coolant slowly and I can see drops of coolant](https://i.redd.it/do8exmzl9pj41.jpg)