1990 80q No heat

[jason nyby]

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I am definately not looking forward to looking into this.  But, its 20 degr=
ees here in Maine tonight, and I don't drive so well when I'm shivering.  I=
 suspect a clogged heater core as well, but someone suggested a stuck valve=
 that I haven't been able to locate.  I'm flipping through the Bentley and =
I can't find it in there either.  The valve is supposed to be in the engine=
 compartment I guess, but I don't see it.  I am getting no heat at all, its=
 like the outside air is just venting inside the car.