Help! Heater Hose Part Number

[DigitalRelay]

I noticed that hose 16 part numbers don't match from the 525i to the 540i. However, on the 525i, both hose 3 and 16 are the same part number and description - "HOSE F ENGINE INLET AND ADDIT.WATER PUMP".

If you follow the coolant flow, it comes from the Engine Inlet and goes into the horizontal inlet of the Additional Water Pump (#1). Then out of the top of the Additional Water Pump into the Water Valve (15) through Hose 2. Hose 3 says it goes from the Engine Inlet to the Additional Water Pump. Hose 16 for the 540i says it goes from the Engine Inlet directly to the Water Valve, which doesn't make sense. If you have the Additional Water Pump (which I do), you need a hose going in (3) and going out (2).

[DigitalRelay]

let yo click on something that your car doesn't use. Thats why 3 doesn't come up for you.

Bill,

That certainly makes sense, however, since they list the Additional Water Pump (1) and the Hose (2) that goes from the Additional Water Pump to the Water Valve, there must be a hose that goes from the Engine Inlet to the Additional Water Pump, right?

I can only reach two conclusions from this: 1) Hose 3 is required to go from the Engine Inlet to the Additional Water Pump, or 2) the Hose 16 description and location depicted in the diagram are incorrect - "HOSE F ENGINE INLET AND WATER VALV".

Frankly, I believe from looking at the diagrams and the photos that either one of those would likely be able to work.

Again, I appreciate the help.

[Ferret]

Gut instinct here is to go to the dealer, get the definitive part number (beat them with the original pipe if they say it doesnt exist for that car) and then see if you can order it from realoem.

[DigitalRelay]

Well, I ordered and recieved Hose 3 for a 525i. It is definitely not the correct hose, however, I was able to make it work by cutting a few inches off. If I had to do it again, I'd order Hose 16 for the 540i, even though the description and diagram are confusing.