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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Tue, Jun-19-2018, 12:27:13 AM   #1
lcrain
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Default Help with leak diagnosis

I recently overhauled my cooling system and power steering system so have been monitoring for leaks. Took the car out for a drive last night and noticed a trail of fluid. Not oil, so likely coolant. It is dripping from the rear of the transmission, but isn't transmission fluid.



I did find a thread that mentioned a similar issue and the thought was heater control valve. The climate control works both heating and cooling. Any advice would be appreciated.

Unrelated question, what is part number for the below circled piece?



Thanks guys!


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Old Tue, Jun-19-2018, 12:34:53 AM   #2
jayjaya29
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Default Re: Help with leak diagnosis

Did you taste the water? Does it taste like coolant?
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Old Tue, Jun-19-2018, 12:37:43 AM   #3
lcrain
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Default Re: Help with leak diagnosis

Tastes like water...It should be noted that my coolant/water ratio when I refilled the system was roughly 40/60.


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Old Tue, Jun-19-2018, 01:02:39 AM   #4
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Default Re: Help with leak diagnosis

Probably just condensation dripping out of the AC vent. I wouldn't worry.
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Old Tue, Jun-19-2018, 03:21:27 AM   #5
Texaz3
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Default Re: Help with leak diagnosis

A/C condensation. Coolant has a chemical smell and tastes like shit.
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Old Tue, Jun-19-2018, 03:39:40 AM   #6
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Default Re: Help with leak diagnosis

The part number is right there on the piece in question. You won’t like the price though.
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Old Tue, Jun-19-2018, 04:54:53 AM   #7
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Default Re: Help with leak diagnosis

Actually, glycol based coolant tastes quite sweet.
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Old Tue, Jun-19-2018, 05:43:52 AM   #8
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Default Re: Help with leak diagnosis

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Originally Posted by M3AN View Post
Actually, glycol based coolant tastes quite sweet.
Not if it has bitterant in it. They do this to keep animals from drinking it.
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Old Tue, Jun-19-2018, 01:40:44 PM   #9
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Default Re: Help with leak diagnosis

Would AC condensation start dripping within 30 seconds of startup? The first test drive after the work it was fine, no drips and I drove it somewhat hard. The second time it started to drip almost immediately when I backed out.

Appreciate all the input and thoughts.


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Old Tue, Jun-19-2018, 02:20:00 PM   #10
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Default Re: Help with leak diagnosis

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Originally Posted by lcrain View Post
Would AC condensation start dripping within 30 seconds of startup? The first test drive after the work it was fine, no drips and I drove it somewhat hard. The second time it started to drip almost immediately when I backed out.

Appreciate all the input and thoughts.


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Yes, it all depends on the moisture in the air. After you drive the car, water sometimes pools in plastic underpanels, and starts dripping right when you re-start the car. I honestly wouldn't worry about it, it does not look like any liquid that is inside any of the drivetrain internals - it is clearly A/C condensation.
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Discussing Help with leak diagnosis in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)