Heat exchanger leaking after water pump replacement
 

Getting ready to put the fan clutch +shroud bak on and notice a very slow leak coming from oil heat exchanger.
Anyone replaced this before? I just wonder about oil inlet/oulet hose(item 1 & 2), do you need special tools to unhook them from the exchanger?

I wonder if I wiggled the thermostat housing a little too much. here is the picture (item 11)

Are you leaking antifreeze?
 

If you are leaking anti freeze, it might be the thermostat.(not water pump thermo)

RealOEM.com BMW E53 X5 4.4i RADIATOR/EXPANSION TANK/FRAME

part 15

Not sure your specs though.

Mine starting leaking after rad replacement, and then stopped after a few weeks.

Yes anti-freeze leaks, very slow about one drop every 15/20 sec.

This is not the rediator, it's behind it on the passenger side. Some people had the leak so bad it actuallu mix the auto-trans fluid with coolant (not good). My concern is getting the oil lines of the core (in my picture).

I'll check how much the indy/dealer change to replace it I guess.
Thanks.

I think part 15 is leaking.
 

It drips down the line and collects at part 11 (oil cooling pipe).

At least on my truck, that was the problem. Here is a good look at the part.

Image Gallery(ES:37560): Thermostat

Mine was leaking around the metal clip. I guess the seal was made lose when I was replacing the big radiator. Mine was leaking exactly like yours.

I don't think the oil cooling pipe inlet is the problem, but I really can't tell since I am not there.

I ordered the part to replace it, but it stopped leaking on its own. I guess the seal formed back somehow.

Good luck

Luke,
mine is for sure the heat exchanger itself is leaking. I see no coolant in the connectors or hose.

My concern is taking the oil inlet/oulet from the heat exchanger in the process of replacing the exchanger. Not sure if special tool is required, hope Weasel can chime in, right now I can drive my car but if I mess with the oil lines and it leaks than I am screwed (I'll be loosing auto trans oil).

heater exchange
 

ok.

If your heater exchange it cracked, that will do it.

I wrapped a paper towel around the thermostat (part 15)and ran the truck for a little. No drips.

The then took off the paper towel and is was wet with antifreeze, then the drip started on the heater exchange again.

Hope you get it sorted out.