Climate control/Fan is not working - any ideas ?

[m3f_Predator_7d824d33ea]

I started the car and went for the AC pressed the fan on and put it on full blast. The display is working fine giving me all normal readings but no air is coming out.



So i switch the car off and see if the fan is working , all i can hear is a sort of buzzing noise and nothing else. The fan does not spin at all, there is no air being pushed out.



Does anyone have a clue as to what the climate control/ fan unit is doing.

Is there anyway i can rectify this ?



Its finally summer and when i need the f%^kin Air Con it dies on me. my usual stroke of luck.



In advance thanks for your help.

[m3f_Sirius_880bd69485]

Probably your final stage resistor for your blower motor, or a bad connection.



The resistor is a common failure point for the climate control system

[m3f_Predator_7d824d33ea]

is there any way i can change the resistor ? or do i have to go to the dealer ?



cheers once again for your help Trevor.

[m3f_Sirius_880bd69485]

You can do it. Its burried under the dash board, above the gas pedal, I believe. Should be stuffed into an air duct for cooling.



I want to say the resistor is like $50 or something. Don't quote me on that. :P

[m3f_beemertek]

Final stage and resistor are two different things. A final stage is found on a new IHKA system like an e46 or e39. It's hooked to B+ and also recieves a pulse width modulated signal from the IHKA control unit. This signals duty cycle changes depending on the blower speed request and the output voltage to the blower from the final stage is varied. Usually the complaint for a bad final stage is the blower changes speed by itself.

The blower resistor on our cars is exactly that, the blower speed is changed by changing the resistance in the circuit. When a resistor goes out the blower usually goes the wide open. Built-in failsafe (no blower=no defrost=wreck=lawsuit)



You should check the blower and see if it's stuck. This happens when the brushes contact a bad spot on the armeture. Remove the seal around the cowl that's in front of the windshield wipers. Open the plastic net piece up so you can reach your hand in on the pass side. Feel around for the inside of the blower.You should be able to give the blower a jump start. Remember to do this with the car and blower on but don't forget that your sticking your fingers in the blower so be ready when it starts going.

[m3f_Sirius_880bd69485]

Ahhh. I'll have to correct the tech that told me about the final stage resistor then. :growls:



This is why I work in the body repair business....



Kinda nice having an actual tech floating around the boards. :thumbsup: