Identify That Part! Cooling System...

[Golgade]

Does anyone know what the black part(at least on my car it is black and I think it is plastic but its raining and I dont want to check!) that bolts into the water pump and connects to the radiator hose that goes to the top of the radiator. I have developed a nice coolant leak and I notice a nice crack on that black thing and some leaking is coming from the bottom. So I need a new one of those, is that going to be a dealer part or does would schucks or Napa going to have something like that? And what coolant am I going to need for replacement?
Thanks
Dan Lafley
95 530i

[Dave M]

Its never raining at realoem

I can't see anything but a water pump and coolant hoses, no intermediate black plastic connection bit. Have a look at the diagram and keep in mind that I don't have a 530.

Dave

[DaveVoorhis]

Sounds like the thermostat cover. In the UK, these are available from some aftermarket suppliers such as eurocarparts.com.

[Dave M]

............unless you're talking about the thermostat housing, which appears to connect to the lower rad hose.

diagram

Heres one at BMA for $15

Dave

[yaofeng]

This is the best picture I have. There is nothing connected to the coolant hose to the radiator other than the inlet and the outlet.

[Tiger]

Sounds exactly like the thermostat housing. The plastic one will leak as it age. Get the metal one.

[Golgade]

Thats it, the black coupling thing, but I suppose calling it a thermostat housing would make it easier to find.
Thanks!!!
Dan

[Golgade]

Oh I forgot, I am going to change the coolant too, What kind of coolant am I "supposed" to use, and where is the drain plug.
Thanks!
Dan

[Golgade]

I probably need to buy a new Thermostat and the housing I would imagine, but anything else? I hope I dont need a new water pump.
Dan Lafley
95 530i

[Tiger]

Just make sure the thermostat comes with new gasket. Easiest coolant to get is the Zerex G05... get the premixed one and you don't have to worry about water. Also get new clamps.