Coolant leak from engine bay (pictures/video)

[jackf80]

Hi guys. I had a brand new OEM charge cooler fitted a couple weeks ago as the previous one was leaking internally and threw up a drivetrain malfunction. After installing it everything was good, coolant level stayed at max, temps stayed low etc. However this morning I saw a puddle formed on the floor overnight under the front-right side of the engine. When I checked the charge air coolant reservoir it was below the min fill line. Engine coolant level is fine. Does anybody know if this is a common issue on these cars, and what might be causing the leak? Is it likely to be just a loose hose/connector or could the thermostat or radiator need replacing?

Car is a 2017 M3 Competition, just passed 31k miles, stage 1 BM3 tune.

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https://youtube.com/shorts/DmQikZTpuX4

[jaylazy2020]

Might be a long shot but my front right hand side or left hand side if standing in front of car looking under the bonnet main coolant pipe to the large radiator popped off.

I had a coolant flush done and pressure test and all appears ok for the last 6 weeks.

Very hard to know what made it pop off.

I had been running stock up until 3 weeks until came off.

[jaylazy2020]

Sorry. I see from your video that the pipe is connected ok

[AlmondJayRoM3]

Originally Posted by jackf80

Hi guys. I had a brand new OEM charge cooler fitted a couple weeks ago as the previous one was leaking internally and threw up a drivetrain malfunction. After installing it everything was good, coolant level stayed at max, temps stayed low etc. However this morning I saw a puddle formed on the floor overnight under the front-right side of the engine. When I checked the charge air coolant reservoir it was below the min fill line. Engine coolant level is fine. Does anybody know if this is a common issue on these cars, and what might be causing the leak? Is it likely to be just a loose hose/connector or could the thermostat or radiator need replacing?
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Could be any of those. Hoses are a possibility especially after disturbing the o-rings inside the connectors.

Rinse off residual coolant and get some coolant compatible UV dye. You should be able to quickly find the source of the leak with a UV light.

[Groganrocket]

Have you check your windshield washer fluid it may be leaking as my wife was and I thought it was the coolant, but thank God it was just the washer fluid leaking.