tony viv

I have 2 problems with my a/c..
Frist is I have been having intermittent warm to cold with my a/c.. Ive had
it evact and recharged and checked for leaks, all is ok. I was told its
probably the temp blend door or motor. I pulled the ashtray area and
glovebox found the motor and watched it work. When I turn the dial from hot
to cold the little circle does turn completely from one alignment mark to
the other and when I set it in the middle it stops on the middle alignment
mark. So now Im thinking the motor is good but the gear is stripped, could I
be correct? I thought to change the motor since its only 30$ but I cant
figure out how to get one of the bolts out that is under a steel bar with a
tab tack welded to it. I tried numerous sockets and ujoints but it is a tiny
space. Also when I can figure out how to get it out how do you possibly get
it back in since you can barely get 1 finger in there much less 2 to get it
started?? Any tricks or ideas.

Second problem is that when I keep it in fresh air mode it kicks in and out
of recirculate but the dash lights do not light to show its in recirculate
mode, If I put it in recirculate(max) it will stay in max and not kick in or
out and the lights are lit. Odd thing is that it only happens when you are
using the A/C, it doesnt happen when its cool and the heat is on. I thought
it may be the hot/cold dial so I set in different positions, still kicks in
and out. I then tried with the A/C button on and off and it seemed to stop
kicking in and out of recirculate, so I believe it has something to do with
the A/C button.
Is my only option to buy a new control head?? For 140$ i dont want to just
throw parts at it. Can you take the cover off the control head and adjust or
clean the copper fingers or switch or is it a sealed unit?

Sorry for such a long post I just wanted to give all info I have come up
with.
Thanks
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Tony V
98 Tahoe Sport z71