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Discussion Starter #1
We have a BMW 320i SE Touring 2007.
The blowers work fine and the AC works well too but we just can't get any heat from the blowers. I have purchased a Diagnostic Kit and have an error for the Auxiliary Water Pump. I'm a complete novice when it comes to this wort of thing but could this be the issue? Is there anything else I should be looking at first before purchasing a new AWP?

Any help would be appreciated.

Thank you in advance.
 

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Nuclear engineer
02/2012 X5 35d M57Y CPO 99K miles NOKIAN WR G3 12K miles
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Hot-water Control Valve internal plastic seals come apart and block the orifices.
 

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3/2007 328xi E91
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...320i SE Touring 2007. The blowers work fine and the AC works well too but we just can't get any heat from the blowers. I have purchased a Diagnostic Kit and have an error for the Auxiliary Water Pump. I'm a complete novice when it comes to this sort of thing but could this be the issue? Is there anything else I should be looking at first before purchasing a new AWP?
Not sure what exactly you are describing as "a Diagnostic Kit" but INPA can diagnose Auxiliary Water Pump (Zusatzwasserpumpe) and Water Valve (Wasserventil) using Activations (Stuern). You connect to the JBE Module (JBBF) and select F6 (Steuern), and then F4 Aux.Water Pump / Valve. Using INPA, you can either turn on the pump for 30 seconds, or open the valve for 30 seconds to test operation of either, just by connecting to the OBD II Socket and making the appropriate entries on your laptop keyboard.

As you see from the schematics linked below, BOTH the Pump & Valve are wired to, and controlled by, the JBE (Junction Box Electronics) Module (A4010a), AKA the "JBBF" in INPA nomenclature. So if you don't have INPA, you need to test the pump & valve the old-fashioned way, by disconnecting the connectors: X122 for Pump & X85 for Valve and applying voltage per the schematic. Here is a "Connector View" for X122 (X85 should be same):
https://www.newtis.info/tisv2/a/en/e91-320i-tou/HRKmwxEh

If you don't have INPA, you could always test electrical function of either using the following TIS circuit diagram, and "Installation Location" showing Auxiliary Pump (M37) and Water Valve (Y4a):
https://www.newtis.info/tisv2/a/en/...nditioning-functions/air-distribution/xFLI7GJ
https://www.newtis.info/tisv2/a/en/e91-320i-tou/1VnbhPr7F8

If that is NOT the correct schematic for your 2007 320i E91, go to this TIS home page and enter the last 7 characters of your VIN:
https://www.newtis.info/tisv2/a/en/

TIS circuit diagrams are interactive, so you can click on any BLUE component ID#, such as M37 or Y4a and get more information, such as "Installation Location" or "Connector View." If you have any questions about interpreting the TIS circuit, or how to test, please let us know. Unfortunately, E9x models sold in the US do NOT have either the Auxiliary Water Pump or Water Valve, AFAIK, and I do NOT have any personal experience with either.

Please let us know what you find,
George
 

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Discussion Starter #4
Thank you so much for your reply. I think I'll need to pass on these details to a friend of mine who will know more about this sort of thing in this level of detail. If I find out what the issue is I'll post my findings here.
Thank you, your help is really appreciated!
 
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