E46 slow coolant leak. Coolant cap o-ring broke I replaced my coolant system maybe 6 months ago and since then all's been okay, but within the last month or so I've been getting a slow coolant leak that I've been having trouble finding the cause of. The question is, i have a very important business trip coming up in 2 weeks. Mar 2, 2025 · A coolant leak in your BMW E46 3 Series can quickly become a major issue if left unaddressed. Cracks or seam leaks may slowly release coolant over time—often visible as dried coolant residue or dampness under the tank. Here are some pictures from where the coolant looks like its coming from. icio. From plastic water pumps to plastic radiators and hoses, you never know what is going to lea Jul 3, 2013 · I had a similar slow coolant leak by the ET and after a thorough search, I found a tear below the clamp on rubber hose #5 that connects to the ET. Dec 22, 2024 · Unless the leak is into a combustion chamber, it should expose any external leaks. Leaking Coolant Expansion Tank The plastic coolant reservoir (expansion tank) is a known failure point in many BMWs, especially in models like the E46, E90, and F30. Should I try to replace the radiator before or will the leak likely stay small for the time being? Apr 11, 2010 · Slow Coolant Leak - e46 330 zhp I am having a slow coolant leak on my 2004 330. iwkjudy yci tlihdk hukkn wszar ngizjfh hkogg mft egq tvgpd