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E36 (1991 - 1999)
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Old 03-03-2020, 02:49 AM
99323ti 99323ti is offline
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E36 heater and throttle body bypass questions

Hello everyone,

I got an 99 E36 323ti w M52B25 engine. I did check every hose and cooling system component when I bought the car. It has a new radiator, water pump, thermostat/housing, main thermostat/radiator hoses, coolant flush etc.

As I live in Brazil w a pretty warm weather, I decided to bypass the heater core and throttle body when doing this cooling system overhaul. I decided to do that just to be on the safe side, as I donít use it, its old and would probably give issues in the future.

So hereís the first diagram of what I did. It had a leak pointed in red there after bypassing, which I was able to fix with a new hose (the bypassed hose that go through the throttle body).


I have been running like this for 7 months now, various road trips etc and car is perfect, but what started to happen now is a new leak at the bottom of the radiator reservoir, very small buts there, and itís a brand new radiator.

So I am wondering if those bypassed hoses are the cause of the leak points, maybe the system is building too much pressure somehow? That bypassed hose is pretty large and it usually stays closed when not using heater core so I am thinking to just cap them following this second diagram:


What do you guys think? Does it has any correlation w the leaks or I am jut overthinking it?
Also, would capping those cause any issues in the coolant flow whatsoever?

Thanks
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Old 03-08-2020, 02:51 PM
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hornhospital hornhospital is offline
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Welcome to Bimmerfest!

Your modification has nothing to do with the leak. It's old German plastic. It's eventually going to fail. Change the reservoir.
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Old 03-10-2020, 03:19 PM
99323ti 99323ti is offline
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Originally Posted by hornhospital View Post
Welcome to Bimmerfest!

Your modification has nothing to do with the leak. It's old German plastic. It's eventually going to fail. Change the reservoir.
Thanks! well this is what I initially thought too, until it started to leak

Its not old, it is a brand new radiator and was bleed properly. I just don't wanna spend money replacing it again to end w the same leak, so I am wondering what can be wrong...
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Old 03-10-2020, 03:47 PM
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hornhospital hornhospital is offline
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Pressure test the system to find precisely where the leak is. It could be something as simple as a loose or misapplied hose clamp.
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1993 325is M3 clone"Ashlyn"; 1993 325is "Elvira"; 1985 635CSi "Katja"; 1984 633CSi "Sylvia"; 1987 325is "Odette";1995 318is"Bebe "; 1985 325e "Hazel Ann"
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