The heater fan is behind the glovebox. If you remove the glovebox and look up from underneath, you'll see the blower motor. It is held on by three screws. In front of it the blower motor resistor, which also sometimes goes bad.
try changing the fuses for the blower or maybe the motor blower itself or the blower resistor.....................
check the blower motor resistor
if your blower motor is not properly working it is most likely your blower motor resistor. it is located next to the blower motor which can be found by looking through your glove compartment. 17.99 at your local autozone
the heater blower is located under the dash on the passenger side. easy to change ,4 skrews.
Defective Blower Motor Resistor Pack.
it is underneith the passanger dash above the black panel under the dash behind the blower motor
Most of them are visible if you drop the glove box door.
It is on the evaporator case and is held in with 2 screws.
Blown blower motor fuse? Bad resistor pack at blower motor? Bad fan switch?
IF YOUR TALKING ABOUT YOUR A/C OR HEAT, YOU HAVE A DEFECTIVE BLOWER MOTOR RESISTOR
Blown blower motor fuse? Bad blower motor or resistor? Check to see if you are getting power to motor - if so motor is bad if not check fuse and/or resistor Bad switch?
There are a couple of reasons why a 1999 Oldsmobile Alero ac heater to stop working. The heater coil may need to be replaced or the HVAC blower motor may need to be replaced.
heater blowe motor relay is under the hood,behind the battery there is a box that has a round knob u unscrew and on the back side it tells wich ones are wich. there are also fuses for the blower motor.that is the problem i am having. everytime turn heater fan inside car on it blows afuse.not sure why.has new resistor.
A common problem is that the heater resistor/ circuit board is defective and need to be replaced. The main symptom is that the heater fan with not run on the three low speeds but will run on high.
May be the resistor pack. it is located under the dash on the passenger side. there is a connector that faces down near where your toes would go if you were sitting in the passenger seat. the resistor pack is held in place with 3 screws(i think) and drops down. fairly easy to replace.
It is behinde the glove box on passenger side it takes a 5.5. mm socket to get it off... good luck.
Just had the same problem. First my blower motor would onlywork on "high", and then it started to change speeds and shut off by itself. Replace the resistor mounted in front of the blower motor.It costs about 40.00 at a dealer.
The Blower Motor Fan is situated inside a housing, which is behind the glove box. You need a simple 7 mm socket to take out the 5 or 6 bolts holding the glove box, disconnect the power connection to the glove compartment light, then you will see the cylinder-shaped housing for the blower motor right in front of you. The Resistor is located on top of the housing, which seems to be inaccessible from the "front" or passenger side. This part is where I am stuck... but at least I know roughly where it is!!!
1. A bad dash controller. 2. Electrical issues.......... 3. A bad a/c heater blower motor..........
IT IS THE BLOWER MOTOR RESISTOR, IT'S USUALLY FOUND BEHIND THE GLOVEBOX COMPARTMENT, THEY COST ABOUT THIRTY DOLLARS AND ARE EASY TO FIX. HAVE A MECHANIC TAKE IT OUT FOR YA AND GIVE HIM THE NEW PART TO PUT IN.
It's under the dash on the passenger side. It's fairly easy to replace, lots of how's to out there on the internet. Cost of the part should range from 20-30 depending on the brand you go with.
Your lower resistor for the HVAC blowing unit is bad. You can buy this part at a carquest if you have one nearby for less than $20. I did some research on this since my 1999 alero had the same issue. I replaced it, and it did work for a little while (less than two weeks). However, it failed again, so i am stuck with my heater/ ac blower only working on High. I cannot locate the instructions I used to replace the resistor, but i can give you an idea, and you should be able to figure it out from there. Here are my simple steps: #1) First, you should buy the lower resistor for your HVAC unit from carquest or another parts store. GMpartsdirect.com is too pricey, but if you go to them or your local gm dealer, you can get the part as well... If you just explain the problem they should know what you need, but it is called the lower resistor for the HVAC blower unit. #2) after you have the part in hand, you will see that it has a wire connector (female end) and a credit card sized chip attached to it. #3) The blower motor is on the passengers side of the car, on the floorboard at the very front of the car attached to the firewall, you will have to lay on your stomach and look up to see the wire harness that attaches to this lower resistor. #4) the size of the nut is 7/32. A socket is probably they easist method on the FRONT nut, on the rear nut, you will probably have to use a 7/32 wrench, i bought mine at craftsman. Basically, locating the resisor is the easy part, i had extreme difficulty trying to get the resistor out, but i eventually did, and replaced it. Like i said before, mine crapped out again in less than a week, so i have not replaced it again, i figure that i can live with my blower working on only high, atleast it still works...
It probably has a bad heater core