2001 Pontiac Grand Am
3400 V-6
Repairs done prior = 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.
done to repair = 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.
Tech = JK
question = What else can I check short of replacing the blower motor?
Is there a speed control switch that can be replaced?
JK:
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.
3400 V-6
Repairs done prior = 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.
done to repair = 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.
Tech = JK
question = What else can I check short of replacing the blower motor?
Is there a speed control switch that can be replaced?
JK:
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.
Other related articles:
Problem With My Blower Motor Fan No Low Speeds
2000 Pontiac Grand Am 3.4
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?
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.
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.
