Tiny coolant leak 09 e93 m3 plz help

KubieSnacks · 03-24-2022, 12:41 AM

Hey recently got a 09 e93 m3. I have developed a coolant leak that’s only a couple drops that happens only overnight. I do no leak coolant while car is on or driving just after I park in my garage for the night. Anyways I see some dried up coolant right next to my oil filter housing. Any ideas what it is? Coolant overflow line? Temp sensor o ring? Pictures will be attached.

drrust · 03-25-2022, 05:50 PM

Check your water pump, if you take a flashlight you maybe able to see the area below the pump. There's a small weep hole there. When I had a leak I was able to see a small amount there. Also look at the thin lines coming from the expansion tank.

I recently had a leak at the back of the thermostat housing, but that was dripping into the vee. For a while I could only smell the leak.

03-24-2022, 12:41 AM	#1
KubieSnacks Registered 0 Rep 1 Posts Drives: 2009 E93 M3 Join Date: Mar 2022 Location: Cali iTrader: (0)	Tiny coolant leak 09 e93 m3 plz help Hey recently got a 09 e93 m3. I have developed a coolant leak that’s only a couple drops that happens only overnight. I do no leak coolant while car is on or driving just after I park in my garage for the night. Anyways I see some dried up coolant right next to my oil filter housing. Any ideas what it is? Coolant overflow line? Temp sensor o ring? Pictures will be attached. Attached Images
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03-25-2022, 05:50 PM	#2
drrust Captain 336 Rep 724 Posts Drives: E90 M3 DCT Sedan Join Date: Jun 2016 Location: Cincinnati iTrader: (0)	Check your water pump, if you take a flashlight you maybe able to see the area below the pump. There's a small weep hole there. When I had a leak I was able to see a small amount there. Also look at the thin lines coming from the expansion tank. I recently had a leak at the back of the thermostat housing, but that was dripping into the vee. For a while I could only smell the leak.
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