5kcstq, hot "econ" air

[Robert Deis]

Isn't there a flapper door in the system that keeps air away from the
heater core?

With your intermittent cooling under the AC I'd guess that this door isn't
working right.

--
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  Rob Deis                  "Let the people know beforehand what the law
  MiB3347                      is and what they are to expect."
  rdeis at io.com                              -- 18th Congress, Rec. 75