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 vacumn 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.
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