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Old 05-18-2018, 05:08 PM   #1
cocofunk
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Default Firewall to tranny coolant leak. heater core?

I have a coolant leak from the rear of the engine, firewall, which drips onto the tranny and onto the floor from the tranny.

I checked the plastic "Y connector" which bolts onto the head, and it does not seem to be that. That connector is on the passenger side, and my leak appeears to be more on the driver side. Additionally, I see moisture/water seeping from the heater core plastic connection (the one at the firewall) which connects the hoses to the heater core.

Is this leak common? How to address this? New heater core connection part needed? Is it a bad idea to bypass the heater core since I will be using this car for track anyway?

Looks like 6 on this diagram. http://www.realoem.com/bmw/enUS/show...diagId=64_0663

Also FYI - car has been sitting for months and I have replaced, H2O pump, tstat with housing, timing cover gaskets, front seal, rear seal, oil pan gasket, oil filter housing gasket, oil filter housing bush. Now it turns right on, no prob, just have this leak - may have happened when dropping/rising the engine when doing the oil pan job.
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Old 05-18-2018, 09:24 PM   #2
spidertri
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Not sure that it's a common leak but I do recall seeing writeups where people have replaced the connectors (and the whole heater core).

I'd keep the heater, if you ever have a humid track day it's nice to use the heat to clear the windshield. That and when you have heat blowing you know the cooling system is working, lol.
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Old 05-18-2018, 09:32 PM   #3
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Yep. #6 is where the leak is coming from most likely. I had to chase mine down recently. It leaks behind the cowl and runs down the water drains making it look like the back of the engine. Replace #6 with new o rings and be careful when tightening it onto the heater core. I was lucky and didnít need to replace the heater core after replacing #6. Hope this helps.
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