milli

Hi,

Since yesterday, the blower fan is running very slowly(probably @ setting 1 speed) at all settings. I searched and see it could be the resistor. But then I also read it is applicable only for manual control. For automatic control(which I have), it would be the fan control amplifier.

Can someone confirm if it is the fan control amplifier or the fan itself which I need to change? Also can you provide pointers to "how to" on them. Much appreciated. Thx.

cjanderson3

I was about to reply with "blower motor resistor," but then I read on lol.

I would say if you have a salvage yard at your disposal you could always buy a climate control unit and test it out. If that doesn't solve your problem return it.

DennisMik

iTrader: (2)

It's a possibility that the blower motor is binding in its bearings and can't spin. You might want to pull the motor and check it before buying any parts.

You can check the voltages on the wires of the fan control amplifier and maybe that will show you something. Do this with the connector plugged in.

There a 3 wires in the fan control amplifier connector -
pin 1 is a thick blue/white stripe wire. This wire goes to the fan motor.
pin 2 is a small blue/yellow stripe wire. This is the control signal from the dash board switch.
pin 3 is a thick solid black wire. This is ground.
These voltages can vary a little bit from car to car, but should be close.

milli

Thanks for your quick responses. Would a bad relay cause this issue as well? Just wanted to check.

DennisMik

iTrader: (2)

No. Relays don't cause this kind of a problem. A relay works like a switch, supplying power to something. So if a relay goes bad, it like a fuse has blown, no power.

And while relays don't go bad that often, they are currently the "in" thing to blame for a problem. The rest of the car should be as reliable as a relay.

milli

Thanks. Was looking in to it and noticed when the car is stationary(either on or off), nothing comes out even at the highest settings. Is it possible when the car is running, the circulation blows out air automatically with out the fan on? Possibly the fan is not working at all which might lead to the bad fuse or relay as well right?

Amerikaner83

iTrader: (17)

can you switch the mode and have it work? Like defrost, floor, etc?

milli

Yes I tried and the fan doesn't seem to be turning on in any mode. I just checked the fuses and they are good.

DennisMik

iTrader: (2)

Is this a new development? In your original post, you said the fan would only spin slowly. With the fuses being good, this makes the finger point more at the fan control amplifier.

milli

Yes only today I checked when the car was stationary and no air was coming out.

Relay turned out to be good as well. Seems like the fan control amplifier. Getting the part 'morrow and will keep you posted.

Thanks for all your inputs.

slfalco

Unplug the connector to the blower, force the fan speed to max, then measure the voltage that the motor is getting supplied to it on the connector tabs. If the voltage is good, then the blower is bad.. if the voltage is too low, then the fan control amp is most likely bad. I would bet the motor is dying. Motor is cheaper than the amp.

milli

Replacing the fan control amp worked. Thanks for all your inputs again.