A/C Fan No-Go - Clarify solution posted by by Jason Wagner
Possible solution to repair AC fan that will not run. Quote:
The problem is the ac resistor located on the passenger side of the center console. It's a little difficult to get to but not impossible. If i remember correctly it cost about 100.00$ from your BMW dealer.
How do I get into or remove the center console to get to the resistor? How will I recognize this particular part. Can it be tested or do I need to spend $100 for a new resistor and take a chance thats the fix? I appreciate your your fast response because this stuff never breaks in June or Sept - only July or August - 90 plus temperature! Marc
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Re: A/C Fan No-Go - Clarify solution posted by by Jason...
I'm not too clear as to which of the two AC fans is not working.....Is it the condenser fan (the one out front of the radiator, mounted at the front of the engine compartment) or the cabin fan?.....either one will stop working in the event of low gas pressure in the AC system.
Is the AC working at all?
The removal of the center consul is not a small job....and to get to the resistor, is also, not very easy....I'm sure that if it is the resistor that has become defective, you'll be able to get one from a breakers yard....They don't usually give problems on the BMW....Incidentally they control the lower speeds of the interior fan operation, but not the high speed, so if the fan works when full and not any other speed, the resistor is the problem.
The fan operation is also fused....A good idea is to check the fuses....
Does the climate control work?
I think I need more clarification and then hopefully I can help a little more....
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No. This is posted in ac cars and trucks...in that case either the blower motor or the blower motor resistor is bad. If a home unit then either motor or run capacitor are at fault UNLESS you have a multiple speed fan in which case the speed control board may be bad.
You will probably need to replace the resistor behind the dash. Usually the first symptom is the fan will only blow on high but not on the lower speeds. If that is the case, then the resistor ( cheap fix) is the culprit.
If you just lost it all of a sudden, you should check for a bad fuse and will probably find other things that don't work too. Replace the fuse and watch to see that it doesn't go out again - which if it does, you have a short somewhere that needs to be fixed.
This is very common, this sounds like the blower resistor went bad, the blower resistor is what controls the fan speeds, the is located on the heater box next to the blowermotor, its held in with two screws and slides into heater box, lets see if i can send you a photo of the blower resistor to help you locate it.
First check the 15 amp HVAC fuse located in the main fuse block inside the car on the passenger side of the center console, under a cover. If the fuse is good, then the problem may either be the HVAC blower switch (which is the fan blower selector switch), the fan blower motor resistor, or the fan blower motor. An auto repair manual will explain and illustrate for you the steps on how to check each of these components.
Even after pushing the ac light switch on, the fan blower selector switch has to be turned on as well (working) because it provides an electrical path to the positive side of the battery to complete the circuit and turn the ac light on. What the ac light switch does is provide the electrical path for the ac compressor clutch to come on through the ac control relay which is controlled by the car's PCM(computer) when you want ac, but the ac light switch still needs to run through the fan blower selector switch to receive its power. You can turn on the fan without the ac light switch because it gets its ground path(negative) from the blower motor. So the blower motor has to work in order to provide a ground path for the fan blower selector switch to be functional. You could have a faulty blower motor which is why no air blows through the vents. The fan blower motor is located inside the car on the passenger side underneath the dash at the bottom end of the glove compartment box. You'll see it. It's right above where a person rests their feet on the floor. Therefore, if your 15 amp HVAC fuse is good, check to see if you have voltage at the blower motor connector. Unclip the connector and with the ignition on and the fan blower switch moved to any one of the first 3 selections, check for voltage using a multimeter. The voltage will vary because there is a blower motor resistor. Voltage should be higher on setting 3 than 1. If you do have voltage at the blower motor connector, check for a faulty blower motor. The auto repair manual will tell you how to do it using jumper wires.
It's normal that your car is running hot because the radiator fan works in conjunction with your ac compressor. If the ac is on, the radiator fan will be on and therefore the engine coolant temperature will stay in it's normal operating range. If the ac is off, the radiator fan will stay off as well and the engine coolant temperature gauge will begin to rise and show pretty hot (especially at idle). It will do this up until a certain degree then the radiator fan should turn on thermostatically and stabilize the temperature. It's scary and I know what your saying because it does that to my car if my ac isn't on. Don't worry it won't overheat.
Good Evening, If I am translating this properly your fan only works on the high setting? And the other settings do not change the speed? If this is correct respond back and I will help as much as possible.
Resistors control the speed of the AC/Heater fan. These resistors are
switched on and off in various combination's to create the different fan
speeds. When the resistors burn out your fan will only work on the "HI"
setting. The "HI" setting doesn't use any of the resistors and that's
why it works. These resistors are near the blower and the blower is
beneath the dashboard on the passenger side. If you go to Auto Zone, they will have the part you need and they will have the step by step instructions for you to get the job done with common tools. Good luck and keep me posted if you need more information.
The resistors are in circuit only on the lower fan speed settings.
On the highest speed setting, power is switched directly to the fan motor.
Check fan power supply fuses,
Check power is available to the fan when high speed selected.
If all above OK, apply power directly to the motor to verify fan motor runs- if it doesn't the motor may need replacement/repair.