Help with coolant leak please - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)

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.

Bmw135er · 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 First Lieutenant Drives: E82 Join Date: Jun 2010 Location: Cincinnati, OH Posts: 356 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 Drives: White 135i M-Sport Join Date: Sep 2011 Location: Encinitas Posts: 591 iTrader: (0)	I would just take it to the dealership.

04-01-2012, 08:11 PM	#3
Bmw135er Major Drives: E90 M3 Join Date: May 2011 Location: Colorado Springs Posts: 1,441 iTrader: (9)	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.