auxiliary heater pump repair

[shogun]

http://www.meeknet.co.uk/E31/AuxPump/E31_E32_Auxiliary_Pump_Repairs.htm

[Ferret]

It's a shame there's not a source for the plastic end caps on these, every bimmer I've owned, I've sheared off the aux pump outlet at one point or another... the E31 is no exception!

[shogun]

no chance, a friend of mine even contacted Hella in Germany, no way to get single parts.
But repairable as shown on the German forum
http://www.7-forum.com/forum/5/zusatzwasserpumpe-heizung-zerlegt-gereinigt-repariert-86159.html#post829774
or from Japan, even better
http://dd.jpn.org/BMW_HP/20080408/index.shtml

small fault in Tim's write up for E32 and E34, I already told him to modify:

not correct:
"The pump is constantly running when the engine is running or the ignition is in position II"

From the German language tech training material it says:

5.8 Zusatzwasserpumpensteuerung/aux water pump control

Serienmaessig verbaut ist ebenfalls eine elektrische Zusatzwasserpumpe im Wasservorlauf der Heizung mit einer elektrischen Leistung von 11W. um auch bei niedriger Motordrehzahl den noetigen Heizwasserdurchsatz durch den Waermetauscher sicherzustellen.
Pumpenleistung: 950 ltr/H. Die Pumpe ist nur im Heizbetrieb zugeschaltet ab einer Waermetauschertemperatur von 30 Grad C.
Ebenfalls ist die Pumpensteuerung (Einschaltpunkt) abhaengig von der Stellgroesse Y des linken oder rechten Sollwertstellers (eingeschaltet Y>30% /ausgeschaltet Y<25%).

brief translation:
standard scope of supply is also the electric driven aux water pump for the heating system with a motor capacity of 11W in order to ensure also a constant heated cooling medium supply through the heater core. Pump capacity 950 l/h. The aux water pump is only in operation when the heating system is switched on from a coolant temperature of minimum 30 degree Celsius,
In addition the pump control (switch on point) is also dependant the adjustment Y of the left or right nominal value adjuster (switched on Y>30%/switched off Y<25%).

(I hope you can understand my poor translation)


>50 Seiten/pages Informationsmaterial IHKA, 2.1 MB!
http://www.e38.org/e32/klimaautomatik.pdf