So, What Is This?

[ClayW]

Picture from an `89 325ix Touring

[CorvallisBMW]

Whatever it is, it's not factory. Looks like possibly an auxiliary heater for the water/coolant system?

[flyboyx]

i'm trying to think of a reason to pass coolant through this thing. i keep drawing a blank.

[TehRaydarlover]

Coolant to oil heat exchanger, to warm up the oil on extremely cold days?

[chuckdizzle]

I've never seen one of those in an e30 before, but I think some of the above suggestions are correct and that it's a sort of heat exchanger.

[Julien]

isn't that picture from fresh_td's touring?

[iXguido]

What are the coolant pipes that run above the intake manifold and then down toward where the A/C compressor would be?

Also, looks to have 126k or maybe 128k miles, can you confirm?

Looks like a really nice example, good luck!

It's a secondary heater box built for cold climate..milage is 120,628

Sent from my Samsung Note 4