Heat doesn't really work

[DRTE30]

I wonder if the control unit is shutting off the heater valve when the recirc flaps open?

I'm not even sure it's possible, but it does match the symptoms, doesn't it?

I don't think that's possible.  The heater valve is controlled by 12v and is oriented such that when the knob is turned all the way to cold the 12v is on, holding the heater core valve closed.  Turn the knob all the way to hot, at around 20% on the knob the 12v source is shut off and the valve is opened.  It's default orientation for all I know, is that in the event of a heater valve failure, the heat is shut off, so you don't have to drive around with max heat all the time.

The flap can be audibly heard of you were to twist the knob super fast clockwise.  If there is no "thwunk" noise when you turn it quickly to its max heat setting, then something regarding the knob, cable, the little black plastic arm on the outside of the heater core box area or the flap its self is broken or unattached.

[2ruble]

So something is definitely going on with all of my heating, lol - the other day when leaving work it all worked, the blower speeds, the heat was hot and everything was great. The next day the blower knob didn't work (still haven't gotten around to taking all that off to get to the resistor so the knob is kind of intermittent) and the heat was still hot (getting too much, had to turn it down).

had the temp dial straight up for the last couple days and then last night had to put the heat back on and it still worked great. well, this morning I get out to come to work and low and behold... heat doesn't work unless on recirc.... even when moving and recirc off it's only slightly warm; turn on recirc and it'll get nice and toasty while moving and cool slightly at a stop.

Getting kind of irritating, lol - I haven't had time to do anything with any of it due to family things (halloween, lol) and helping a buddy move so I can't say anything about any of the parts with certainty... but those are the symptoms

[///m42 sport]

same issue here