Bypass aux water pump- anyone have pics?

[632 Regal]

aux heater pump and valve comes as a single unit and is around 100 new. Just plug all 3 hoses and drive it where you can work on it. 690... sheesh my god there is NO WAY I would pay anything close to that. part # 64118391417

[EricV]

Huge thanks! OK, don't shoot me here, but in looking at that diagram it appears to me the following:

1.) the aux pump I am after is #1, with two hoses on it.
2.) the heater valve is #15, w/ 3 hoses on it.

I thought my goal was to leave the heater valve on, and remove the aux pump (#1) and just connect those 2 aux pump coolant hoses together.

If the heater valve also comes off then I have 5 hoses and God knows what I connect to what then.

My real goal is to bypass the aux pump only so that I can drive it a few days (short distances, to get through the week until the parts come and until I can do the replacement over the weekend.)

[Rus]

Connect hose 3 to hose 23. That's it.

[EricV]

Connecting 3 to 2 wouldn't do it? Seems simpler. If 3 to 23 then that would in fact require a T connector.

Sorry guys- didn't realize this would get confusing.

[Rus]

No, plugging 3 and 23 won't require a T-connector.
Hose functions are as follows:
3 - Main coolant delivery hose to auxilary pump
2 - Hose connecting auxilary pump to distribution valve unit
21 - Right heater core coolant supply from valve
22 - Left heater core coolant supply from valve
23 - Unified coolant return hose for both cores.

Connecting 3 to 23 will make coolant completely bypass the auxilary pump and the valve unit. Connecting hose 3 to spigot for hose 2 on the valve unit or to hose 2 where it is disconnected on the pump end will bypass the pump. You can do it either way. HTH

[EricV]

Good deal. It sounds like the less fussy route may indeed be to connect 2 to 3 then and hope that gets me through the week. I only have to drive about 2 miles each way (to pick up my daughter after school) so I may be able to limp through the week this way.

I really appreciate the time you guys have taken.

[Rus]

No problem. I could take pics, but all my hoses are connected in a stock configuration so I doubt it'd help too much. What does help is popping off the plastic cover on the valve unit and looking at the hoses. The clips holding the cover can be rather stiff, so be careful if you decide to pull it off.

[bubba966]

Someone correct me if I'm wrong, but the Aux. pump is only to keep the coolant circulating when the car is shut off. Like if you're running the vent feature or just running the fan with the engine off.

Bypassing the aux. pump should then be of absolutely no problem at all to driving the car normally. Only reason the dead aux. pump is giving you a problem is because it's seized up and preventing any coolant to flow through. Bypass it though and that's no longer a problem. Only problem should then be lack of heat after a short while once the engine is turned off.

[Rus]

Actually, I believe the purpose of the pump is to improve the circulation of warm coolant from the thermostat housing to the heater. I also read somewhere that it helps warm up the interior quicker. Some e34 models did not have the pump and still worked fine, so its not an absolute necessity.

[russiankid]

Hose number 2 is actually in the shape of a U but with a slight angle. It would be tough to connect hose number 3 to it.