Cal wrote:
During this time of year, heat into the passenger compartment is greatly
needed. I found open windings on the auxiliary heat pump motor even though
the voltage input was good at 12vdc. Can this pump be bypassed without risk
to the heater core?
If your thermostat is working as it should work, there should be NO lack
of heat in the cabin after you've driven for several minutes.
You can of course bypass the pump, but you MAY find that the heat flow
thru the heater core will be modest or even inadequate except at highway
cruising speeds - in city traffic it may be chilly. The aux. pump is to
compensate for the low water pump output thru the heater core at low
engine speed.
The pump CAN be eliminated in smaller, later cars (201s) without any
detectable loss in heat, and in 124s the heat loss is very modest. Not
sure about 126s.
Are you sure that your heater/AC servo is working as it should?
Marshall
--
Marshall Booth (who doesn't respond to unsigned questions)
"der Dieseling Doktor" [EMAIL PROTECTED]
'87 300TD 182Kmi, '84 190D 2.2 229Kmi, '85 190D 2.0 161Kmi, '87 190D 2.5
turbo 237kmi
