Reasons a Mazda 3 Heater Isn't Working. Mazda 3. The most common reasons a Mazda 3 heater isn't working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor. 0 %. 31 % of the time it's the. 2010 mazda 6 (4cyl) drivers side rear window went down and will not go up. rear window is not an "auto" window. Removed motor and plugged into other rear door's wiring and it turned back and forth. Pl … read more Other possibilities are a failing window motor or loose connections. Here's a cheap test you can do: With one hand activate the window switch. With the other hand smack the door panel several times in rapid succession, the goal is not to break anything, just to introduce some vibration into the door. Note that, for the window to go up/down, +12V must be applied to one side of the motor, but also GND must be applied to the other side of the motor. You should check for continuity to ground in addition to checking for +12V. Also note that all of the current to raise/lower the windows passes through the switch itself. If you’re in the Phoenix area, we can make diagnosing a power window motor or window switch problem easy for you. Call Power Window Repair today for a free diagnosis and quote. Our friendly technicians will quickly determine what type of power window repair you need and get you a quote that you can count on. Call (480)570-5116 today! My mazda 3 power window switch not working on master switch,but the other are working.except on front left hand poer window switch I have a 2005 Mazda 3. The driver's side power window won't go downthe other 3 windows do (from the left door power switch). 6nMFJ.