Troubleshooting e34 ventilation

[Rick Gutierrez <rickg@xxxxxxxxxxxxx>]

Can anyone expound on the following re:  e34 lack of heat.......

What is Modic?  Can't this be troubleshot without going to the dealer ($$$)?

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Heat output should be closer to 165 degrees.

You possibly have a mixing flap leak, this is the flap that blocks off either
the heater core or the cold air intake.

Mixing flaps are controlled by stepper motors and are diagnosible.  Get the
car to someone with a Modic, or to the dealer, and check for logical problems
in flap positions, sensor readings, etc.

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