A: Cable has come off door on defroster.
B: Fuse is blown on that part of wiring. May or may not be listed under A/C; could also be under heater.
C: I believe 96 models still had some inline fuses in the wires. Wouldn't hurt to check.
SOURCE: There is no air flow
You need part GM Part number 89018675 or ACDelco 15-73596. The Mode Selector Actuator. What happens is the part is a CHEAP part POORLY designed and when it goes to turn the flaps inside the HVAC unit its the plastic gear slips instead of turning the flap!!!
Just to forward you you might want a deal to install this art for you unless your good at fixing your own vehicle, because you need SMALL sockets and a lot of patience to get this part in!!!
The part is ALMOST directly above the steering shaft for your steering wheel, so theres a lot you got to remove before you will even see them!!!
I only recommend you to have a dealer put this part in for you, unless you have your own service manual!!
Because there is 5 of these darn things and if you pick the wrong one you will have to do it all over again!!!
3 on the Drivers side and 2 on the Passengers side!!
But replacing this part SHOULD solve all your problems!! AS it did for me and i was having the same issues as you have described!!
SOURCE: No dashboard heat output
The climate control was poorly designed on these cars.
There is only heat on the floor and defrost settings, due to the layout of the ductwork.
SOURCE: Front window defroster and floor, no air flow.
I had the same issue and then I got into a slight accident with a curb. When the collision place was fixing the car, I told them about the defroster and floor and they told me that they had to clean out a whole bunch of leaves and then airflow was restored. Have it cleaned, you may be surprised.
SOURCE: No air flows from dash vents
blend door actuator. to fix, the dasshboard has to be removed, A/C has to be reclaimed, and coolant drained. it is not an easy task for the DIY'er. best left to a repair shop as it is an aggrevating and time consuming process.
SOURCE: Air flow to defrost or floor not switching stays on dash vents
cannot switch from defrost to panel airflow 2001 chevy silverado
Item
Part Number
Description
1
18A318
Vacuum control motor-floor/defrost door
2
-
Defrost air flow
3
18A478
Floor/defrost door
4
18476
Heater core
5
19860
Evaporator core
6
19805
Blower motor
7
-
Outside air inlet
8
19A813
Air inlet door
9
18A318
Vacuum control motor-air inlet door
10
-
Recirculated air inlet
11
18B545
Temperature blend door
12
18A559
Panel door
13
-
Panel air flow
14
18A318
Vacuum control motor-panel door
15
-
Floor air flow
16
-
Vacuum from the engine intake manifold
17
19A563
A/C vacuum check valve
18
19A566
Vacuum reservoir tank and bracket
19
19980
EATC control
Item
Part Number
Description
1
White
Air inlet door
2
Yellow
Floor/defrost door
3
Red
Floor door
4
Blue
Panel door
5
Black
Source vacuum
6
-
Not used
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