;)

that would overwhelm all the hoses in the system..

I always assumed it had to do with the manual climate controls. Maybe the manual valve the 240's use is less of a restriction than the monovalve so it requires less pressure to flow the same amount of water. Just a theory though.

Do I even need an AUX pump? I've fitted a manual climate system from a Euro spec 300TD into my car.

Only you can make that call. Some have removed them and said they could not feel a difference, I on the other hand was cold in my 79 300D until I replaced my bad one which made a HUGE improvement.

I don't know what switches the power to the pump however, does your pump still work with the manual system? If it is working I would keep it, it could only help. Be sure however to add a fuse in for it. There a details of this in the forums and it is VERY important.

I think I'll just delete, I live in So Cal...not much risk of frostbite. ;-)

Fair enough. Keep it on a shelf for later though. You never know.

Here's the Aux pump that this site lists. I'm not even putting it on my wish list.

1984 Mercedes-Benz 300SD Base Sedan - Water Pump, Thermostat & Hoses - Page 1

The "replacement aux pump" in my 84 & 85 300D is a length of 5/8" silicone heater hose. I still get ample heat and noticed no difference. None of my U.S. cars have such a silly device, but perhaps northern Germany is different. The aux pump can clog or stop spinning, thus blocking the flow or leak your coolant on a long trip and ruin the engine. It can also overheat the push-button switch and cause a dash fire. One aux pump was still working fine (no shaft leak yet), but I still pulled it. One W123 guy here installed a cheaper W124 heater control valve (mono-valve) where his aux pump sat, which is another option.

This thread has some info on fusing the Auxillary Water pump.......
and why it should be fused.

http://www.peachparts.com/shopforum/diesel-discussion/241899-i-lost-all-electrical-fire-high-up-dash.html


Yikes!!! I guess that pump is pricy.



Auxiliary Water Pump - Climate Control


Brand: Genuine Mercedes

Part Number: 000-835-69-64-M22

$678.00



Charlie

sent from my pos computer