Can't get a/c to blow from dash vents when I turn the control and the floor is working and defrost is too but I have to keep turning control nob back and forward. For the most part the a/c blows from both defrost and floor but not as hard as it should. The fan speed only works on high. It is the same for the heat.
Check the actuator motor on the heater sounds like the motor is not directing the air as it should. The motor is in the center of the truck inside attached to the heater and has arms on it to move the heater and ac doors.
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: Heat wont blow through heater or defroster vents
common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.
SOURCE: 04 silverado a/c, htr. controls. Only blows through defrost vents
sounds like your door blend actuator which is under the dash and a pain in the **** to replace
SOURCE: 2004 Silverado 2500HD a/c is
Sounds like it is going through the recalibration process. We run into this issue when replacing the batteries on these. In the underhood fuse block there is a HVAC fuse. Pull it, wait 30 seconds, put it back in, and turn the key to the run position. You should hear the vents moving around. wait for about a minute or so, do not touch anything. If the self test/calibration passes everything will return to normal. If after several attempts you can not get it to return to normal than there is a problem with the HVAC system that will need to be resolved.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
SOURCE: i have a 97 chevy
Your vehicle uses electronically controlled blend doors to direct th air flow from defrost to vent and to the floor . If the door motor is bad then it will stay at a fixed position so you will not get the air to flow out the defrost ducts. There are at least two of these one for air blend and one for fresh air. They are located on the passenger side usually under the plastic cover and have a wire harness that plug in and are usually shaped like a piece of pie.
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