'84 GSL with the computer buttons. None of them light up and the position feels like its stuck on floor. I'm going to need to get some defrost action this winter. Checked all the fuses, not sure which one controls it but they all seemed fine. Anything else I could check?
I think this happened with I blew a fuse messing with my power window switch if that helps. But I replaced that.

 

Hello, the same thing happened to my SA (1980). After several hours of debugging i finally sourced the problelm to the Heater resistor Block. Kinda funny because the wirring diagram doesnt even mention such an important peace. Im not sure if the 84' is the same but the resistor is located on the back side of the fan blower motor. It is removable with three bolts and a few hoses removed. Removing the gove box give easier axess. I would deffinatly check that out.

If you need a new one, you should be able to get one from a Mazda dealer.

Regards, ajazeller

 

My fan still works, I just don't have any control over which vent it comes out of I'm stuck on the "heat" or "floor" position right now. I'm not sure if my first post made that clear or not, does anybody know which fuse it is I should check?

 

This is not a fuse, this is the electric motor or metal rod arm that moves the flapper valve in the 'mix' mechanism. To doublecheck the fuses, remove the fuse box cover inside the car (driver left calf area) and you'll be able to pull out and verify fuses for A/C and Motor accessories.

If you are able to push the selector buttons, you should hear several noises, most notably is a 'whirring' sound which is the motor moving the metal rod arm attached to the flapper door, followed by a soft 'thump' when the door seals against the appropriate piping to prevent airflow where you don't want it to go. This is a 'whirrr-thump' sound, and if you're not getting that, you're either not getting power (fuses) or the arm has become disconnected (i.e., whirr, but no thump).

This response is getting very strange... bear with me.

Anyway, if the motor is burned out, you'll need to replace this from Mazdatrix or Victoria British. If you can identify the arm is broken, either the plastic arm attached to the vent flapper door, or the metal rod arm, then you may be able to repair this with some simple ingenuity. This is not a complicated mechanism and the electric motor that controls the rod arm is a simple 'servo' type mechanism.

If you want to get air to the upper vents or defroster without replacing the motor mechanism due to cost, you should be able to move the flapper door by hand which will move and position the metal rod arm to allow for various functions. In the non-electronic A/C versions, when you rotate the selector for Defrost/Vent/Etc. it is a flexible metal rod that is physically attached to the flapper door. This is a low-tech approach, but is much simpler to repair. HTH,

 

Hey thanks, turned out to be the A/C fuse after all. It was missing completely I must have borrowed it for another not knowing it was in use.