Sounds like a vacuum problem. I just did a complete tuneup on my
Blazer today and noticed one of my vacuum lines was old and decrepid
and had sucked itself shut. I redid the lines (one is a feeder line to
the heater control) and now my heater functions work like they should.
For a long time I could only get floor heat and hardly any defrost, I
believe this made a big difference but wont know for sure till I need
the defroster again....the heater directional functions (floor,
defrost or front panel) are vacuum controlled.
On Apr 21, 8:16=A0am, "Lannie Schafroth" <lannie at ct-iowa dot com>
wrote:
> I have a 1992 S10 Blazer. =A0It is 4wheel drive, four door Tahoe
version. =
=A0It
> has the 4.3 TBI with 354,000 miles on it.
>
> The air seems to blow through the defrost all the time. =A0Air does go
thr=
ough
> the heater and vents but still comes through the defrost. =A0I looked at
t=
he
> 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. =A0If I reach in and
gr=
ab
> the little arm inside that moves back and forth and stick a nail through
t=
he
> hole and keep the arm from moving back, then I have full heat with very
> little defrost. =A0I can move to air and it does change from heat to
air.
>
> Is there a bracket or something that has fallen off? =A0My wife and kids
d=
rive
> 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
getin=
g
> it back together and aligned properly. =A0I will redo that after fixing
th=
e
> blower switch. It melts about once a year and I have to clean up the
> contacts and put the switch back on.
>
> --
> Lannie
>
> ** Posted fromhttp://www.teranews.com**
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