Mech just changed the heater core in my 96 Grand Am Se, 2.4l, that is not equipped with A/C. In every vent control setting: cool air blows through front vents with power. BARELY feel hot or cold air through defrost to windshield. AMAZING air to floor, with accurate hot/cold air mix. ALL VENT CONTROL SETTINGS DO THIS! WHAT? Mech just changes heater core. He is a pro! Why am I looking this up? Everything worked beautiful before the heater core swap! Help? Thanks!
Looks like your mechanic messed up. If he has any integrity then he should take care of you. If not and you want to try and tackle it yourself then you have to ask yourself this: do I want to pull the dash out? Because that is what that will entail. Sounds like he may have messed up the ducting somehow. Unless the blend doors and directional doors are electric actuator operated in which case those actuators need to be replaced
SOURCE: 2004 Pontiac Montana blows cold air in defrost
There is a mix damper inside your duct that controls the heat over heater core and ac evaporator that to your floor and one to your defrost. it is probable an electric actuator, that is not functioning properly. If yu can locate it and manually move it, you might have to remove the actuator motor first, you should be able to figure out your problem, I hope this helps! merry Christmas!
SOURCE: a/c vents door control not working
Can you hear anything moving in heater when you move the switch to other settings? If not then the blend door is not moving to redirect air flow. There is three things that could cause this, 1 the control switch is bad or 2 the blend door acturator is bad, and 3 linkage for the door has come unhooked or broke, most likely its #1 or #2. First you need to find the blend door acturator and test light the wires to it, there should be 3, 1 hot with key on 2 only hot with switch moved, and 3 ground. If you got power from wires than the acturator motor is bad, if no power switch is bad.
SOURCE: ac vent problem
Damper/flap for driver's side is probably stuck. Try moving the selector from cold to hot several times. Also, move the recirc/outside air control if the previous doesn't work.
SOURCE: 98 grand prix sse. The climate control system
OK, sounds like the vacuum motor system is either disconnected behind the dash, or the vacuum control for the door inside the dash is broken, somehow.
need to take dash and climate controls off to see which it is.
Good luck.
SOURCE: The blower fan on my 2006 pontiac torrent
The heater blend door actuator (motor) is faulty.Replace actuator
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