Nope, it is the circulation system, that little bypass hose on older
engines (OM615/616/617, M180 etc.) that gets the first warm water to
your heater, rather than having to wait until the radiator is warm
and the thermostat opens.
The Aux heater pump only helps to circulate water to a heater that is
not substantially higher than the head of the engine. Older cars
like 110/111/112/108 have the heater positioned so that the coolant
circulates to the heater by the engine WP and convection.
Isn't it the aux water pump that gives us heat so fast on cold days? (faster
than any other car I've driven).
On Wed, Feb 17, 2010 at 11:05 AM, Jim Cathey <[email protected]> wrote:
My indy has a 1978 300D. The heat does not work and he said it needs a
water pump heater. I don't know what that is.
If it's the auxiliary water pump, you don't really need
it. Unless you spend a lot of time at idle in the cold
climates. Bypass it, or at least just unplug it.
-- Jim
--
OK Don
Panic! (the national past time).
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