Mazda pickup '92 ac heater fan works fine then stops then works ok next time Help?

Answer 1

Ok short answer it is either the blower motor resistor is going bad or the blower motor itself is.To replace the blower motor it is on the passenger side and you have to remove the kick panel just below it and the four screws that hold it in place.Drop it down disconnect the wiring (note how the wiring hooks up to the old part).Connect the new blower due to if you connect the wiring incorrectly the blower will work but not blow air thru the vents properly and just swap the wiring connection to make the blower circulate in the correct direction.Now if this does not fix the issue then the blower motor resistor is bad,meaning it only works in one speed,or none at all.To replace this requires you to pull the whole blower housing down to replace it because it is mounted on top of the blower housing or you can remove the glove box about 10 screws and it is directly below that use a mirror to see it.It has two screws that hold it in place.The alternate plan it to remove the whole blower housing which has one strap holding it and one nut to pull the whole unit down.I would bet the blower motor is the problem FIRST,then if after replacing the fan speed in all selections does not work then replace the resistor.Side note the actual ignition key can affect the blower motor due to wear and jiggling the key or pulling the BIG fuse in the fuse block inside and reinstall makes it work fine can fix this too.It is black and in the center. I would start by replacing the blower motor first.I could write a book on this but this is the shortest version being tired.