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4063Re: [bmw e28] heat inquiry #2

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  • Guy DiCesare
    Dec 15, 2005
      Right! I revved the car at a standstill this morning
      and felt the heat fade away. this discounts the
      possibility of an improperly closing air vent. Thanks
      much. Guy
      --- Ed MacVaugh <macvaugh@...> wrote:

      > Coolant flow through the motor is a product of the
      > water pump speed on
      > BMW engines. Nothing else changes that flow. The
      > thermostat controls
      > that portion which is allowed to also flow through
      > the radiator, and the
      > heater control valve controls that portion that is
      > also allowed to flow
      > through the heater core inside the car.
      >
      > The original post concerned the heat in the cabin
      > being high at rest,
      > diminishing as the car speed increased. While the
      > car speed was
      > increasing, engine speed was also, thus the
      > conclusion that the heater
      > control valve had failed. More heat is transferred
      > from slow moving
      > coolant than fast moving coolant.
      >
      > Ed
      >
      > Blake Nancarrow wrote:
      >
      > >Quoting Ed MacVaugh <macvaugh@...>:
      > >
      > > > I don't agree.
      > > >
      > > > The hot at idle and none while underway are
      > classic symptoms of the
      > > > heater valve on the firewall having a split in
      > its diaphragm.
      > >
      > >Ed,
      > >
      > >What does the heater value do exactly? Does it
      > control coolant flow
      > >through the motor? Into the cabin transfer unit?
      > >
      > >Cheers,
      > >Blake
      > >
      > >Blake Nancarrow blaken@...
      > >Computer Ease http://computer-ease.com/
      > >
      > >(sent via webmail while at Polar Bear/King St)
      > >
      > >
      > >To unsubscribe from this group, send an email to:
      > >bmwe28-unsubscribe@...
      > >
      > >
      > >
      > >
      >
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