A/C only works on settings 4 and 5

[dannerino]

2003 Grand Am. A/C only works on settings 4 and 5. Settings 1, 2 and 3 get nothing, no fan, no cooling. Switched out the controller, that did not fix the problem.

 

[Zimgxp]

The blower motor resistor is bad.

 

[02ga]

I am unsure if grand am's have the same wiring harness as grand prix, but when I had a grand prix I had this problem and it was actually my ignition harness, and come to find out a very common problem with grand prix. Nothing would work except on high, and if wasn't on high my auto lights didn't work. Just throwing in my .02

 

[melsg5]

I vote for resistor also

______________________________

 

[Wmurky]

resistor location

i have the same problem only blows on 4 and 5 , where is the resistor located?

 

[BigRob]

Under the dash on passanger side. By the blower motor.

 

[pittmike]

Thanks for this thread via search. I have exact problem now. Replaced resistor pack on my Ford like that but wasn't sure about the Grand Am setup.

 

[melsg5]

Glad it was of value to you.

______________________________

 

[richardgriese]

The answer is no on the ignition switch btw. In case anyone comes back and thinks it is.