2001 Pontiac Grand Am. My daughter has this car
at college in Warrensburg,Mo, about 45 miles from
home. She called me and said her blower motor
quit blowing in the middle of winter. I had her bring
it home on Friday evening so I could check it out.

The fuse in the passenger compartment was OK.
The 30 amp
fuse in the engine compartment was
blown. I put a new one in and when I turned on the
blower motor it instantly blew again. I took out the
blower relay and it has a corroded post so I
replaced it and the fuse. The blower now works on
high speed only. It has 5 speeds and only works
on #5.

What else can I check short of replacing the
blower motor? Is there a speed control switch that
can be replaced?


Answer:
A common cause for only high speed is the blower
resistor. It is under the passenger side of the dash,
in front of the blower motor, up against the firewall.
The circuits burn, and only high works because
high is on a different circuit, and does not go
through the resistor.

If not the resistor, then will need to check for inputs
to the resistor from the fan speed switch. On the
connector of the resistor, 1 wire will always be hot,
then an additional wire will go hot as you turn the
fan speed switch. Speed 1 will make one wire hot,
speed 2 will make a different wire hot, and so.
Those can be checked with a test light at the
resistor connector.
2000 Pontiac Grand Am 3.4L. Checked and tested all relays and
fuses.
Question: the a/c compressor clutch will not engage so the a/c
does nothing besides blow hot air.  I am out of ideas minus
replacing the compressor or clutch. Is there anything else I
should check before changing out those parts?

Answer:
Be sure the freon charge is good. If you put gauges on it and it
shows a pressure, that does not mean it is freon. It could just be
hot air that replaced the freon that leaked out. Air in the system
will build pressure in an engine compartment that is hot. May
sound silly, but have seen many a good mechanic get fooled by
gauges. You should make sure the a/c relay clicks when you
turn on the a/c, or better yet, swap the relay with another of the
same kind in the fuse box and know for sure it is ok.

If you have a
scanner, you can check to see that the PCM is
getting and sending a signal to turn on the compressor. Lastly,
check for power and ground at the connector for the a/c
compressor, with the a/c turned on. If you have both power and
ground on the appropriate terminals, you know that you have a
bad a/c compressor. If need be, the compressors aren't that bad
to replace. If you can get the front end of the car up on jack
stands it makes the job much easier.
2001 Grand Am Blower Speeds Not Working
Blower motor resistor module causes fan speeds to not work.
Blower Motor Resistor

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