On Apr 21, 8:21 pm, "Steve W." <csr684...@[EMAIL PROTECTED]
> wrote:
> Lannie Schafroth wrote:
> > I have a 1992 S10 Blazer. It is 4wheel drive, four door Tahoe
version. It
> > has the 4.3 TBI with 354,000 miles on it.
>
> > The air seems to blow through the defrost all the time. Air does go
through
> > the heater and vents but still comes through the defrost. I looked at
the
> > heater assembly down by the floor and it looks like there is a hole in
the
> > side where their used to be a screww or something. If I reach in and
grab
> > the little arm inside that moves back and forth and stick a nail
through the
> > hole and keep the arm from moving back, then I have full heat with
very
> > little defrost. I can move to air and it does change from heat to
air.
>
> > Is there a bracket or something that has fallen off? My wife and kids
drive
> > it so they may have found something on the floorboard and tossed it.
>
> > I also have a va***n leak on the controller but that as my fault not
geting
> > it back together and aligned properly. I will redo that after fixing
the
> > blower switch. It melts about once a year and I have to clean up the
> > contacts and put the switch back on.
>
> The vacuum leak is likely the problem. The door that switches the vents
> from floor to defrost is vacuum controlled. The default position of the
> door is defrost. The leak means it stays on defrost.
>
> --
> Steve W.
> Near Cooperstown, New York
had a 90 Blazer once with a similar problem and it had a broken
plastic clip in the bottom of the heater box that controlled the door
operation. It was(at the time) a GM only part(and may still be)and
hopefully it won't be discontinued at this point. It also was(WAS)
about a buck or so. If you suspect this(at some point), hopefully you
have a diagram of this system(or can get), take apart the lower part
of this 'ductwork' and look up from the bottom and hopefully(or not)
you'll see what I saw. Maybe it is what others have said it was and
if you have a leak near the control head, I would fix this FIRST but
after reading your issue-this(above) is what popped into my
mind(****). There is my two cents worth and today it is on sale for
FREE! Good luck-JP
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