Help with coolant leak please

trickcruiser · 03-31-2012, 04:38 PM

I am in the middle of installing the AA intercooler and noticed that I am leaking a very trace amount of coolant. I HAVE NO IDEA what this unit is but it is just behind the radiator, lower driver side. It appears that perhaps the connector might be leaking?

Any ideas on what this is and then what I should do to fix it???

For starters, I am going to finish butting up the intercooler and then let it run to see if it seals itself once pressurized.

Any advice would be great.

Regards,

John Dempsey · 04-01-2012, 07:45 PM

I would just take it to the dealership.

MilehighM3 · 04-01-2012, 08:11 PM

Tough to tell by those pictures, but that aluminum piece is the year exchanger for the transmission. It's either the o rings that seal it to the radiator, or it's the radiator itself leaking from above the heat exchanger. I've seen quite a few radiators leak in that area. A pressure test and some slight disassembly to gain access to it visually will tell.

03-31-2012, 04:38 PM	#1
trickcruiser Lieutenant 99 Rep 508 Posts Drives: F80 Join Date: Jun 2010 Location: Cincinnati, OH iTrader: (1)	Help with coolant leak please I am in the middle of installing the AA intercooler and noticed that I am leaking a very trace amount of coolant. I HAVE NO IDEA what this unit is but it is just behind the radiator, lower driver side. It appears that perhaps the connector might be leaking? Any ideas on what this is and then what I should do to fix it??? For starters, I am going to finish butting up the intercooler and then let it run to see if it seals itself once pressurized. Any advice would be great. Regards,
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04-01-2012, 07:45 PM	#2
John Dempsey Banned 31 Rep 588 Posts Drives: White 135i M-Sport Join Date: Sep 2011 Location: Encinitas iTrader: (0)	I would just take it to the dealership.
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04-01-2012, 08:11 PM	#3
MilehighM3 Brigadier General 915 Rep 3,456 Posts Drives: Harrop E90 M3 Join Date: May 2011 Location: Colorado Springs iTrader: (14) Garage List 2009 E90 M3 [6.50]	Tough to tell by those pictures, but that aluminum piece is the year exchanger for the transmission. It's either the o rings that seal it to the radiator, or it's the radiator itself leaking from above the heat exchanger. I've seen quite a few radiators leak in that area. A pressure test and some slight disassembly to gain access to it visually will tell.
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