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4048Re: [bmw e28] heat inquiry #2

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  • Ed MacVaugh
    Dec 12, 2005
      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)
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