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Heater blower not working

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check and test the blower switch, blower motor relay and blower motor resistor.
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Tuesday, August 14th, 2018 AT 3:04 PM (Merged)
Tiny
UNIONPIPEFITTER49
  • MEMBER
  • 1 POST
  • 2002 PONTIAC GRAND PRIX
Heater problem
2002 Pontiac Grand Prix 6 cyl Front Wheel Drive Automatic

This vehicle blows cold air. The fan knob is labeled 1-5. 1 being blowing low and 5 being the highest setting. The fan will only blow on 5. I replaced the control switch plate and that did not resolve the problem. What should I check next?
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Tuesday, August 14th, 2018 AT 3:04 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The blower motor resistor this one controls the speed for the blower motor from 1-5
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Tuesday, August 14th, 2018 AT 3:04 PM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,540 POSTS
  • 2002 PONTIAC GRAND PRIX
  • 185,000 MILES
My blower for my ac/heater just stopped working. At first it would only work on high now it does nothing.
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Tuesday, August 14th, 2018 AT 3:04 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Get at the blower motor wiring connector. With hvac turned on, check for voltage and ground at the wiring connector. If good voltage and ground with no blower action, suspect the blower motor.
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Tuesday, August 14th, 2018 AT 3:04 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
To add, terminal A at the blower connector is voltage. Terminal B is ground. You can use a testlite between those two terminals, key on, hvac on, If the light comes on bright, you have good voltage and ground.
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Tuesday, August 14th, 2018 AT 3:04 PM (Merged)
Tiny
TOPSOIL
  • MEMBER
  • 5 POSTS
  • 2000 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 90,000 MILES
Blower fan quit working - a week later started working again for a few days- then quit again - fuses seem okay
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Tuesday, August 14th, 2018 AT 3:04 PM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Inspect blower motor relay. Since it seems to be intemittent problem it may be faulty wiring to motor or possible blower motor is going bad. Hard to tell with intermittent problems until it completely fails.

Thanks for using 2CarPros. Com!
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Tuesday, August 14th, 2018 AT 3:04 PM (Merged)
Tiny
TOPSOIL
  • MEMBER
  • 5 POSTS
Where is blower motor located?
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Tuesday, August 14th, 2018 AT 3:04 PM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Blower motor is located behind right side of dash, in heater-A/C module, pictured below..


https://www.2carpros.com/forum/automotive_pictures/261618_1_51.jpg



Thanks for using 2CarPros.com!
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Tuesday, August 14th, 2018 AT 3:04 PM (Merged)
Tiny
BPALMERSHEIM
  • MEMBER
  • 1 POST
  • 2002 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 150,000 MILES
The two slowest fan speed settings do not work at all.
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Tuesday, August 14th, 2018 AT 3:05 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hello, might be the blower resistor, you can check for voltage on the yellow wire, low speed, at the resistor connector, with everything turned on, if there is no voltage, it's not the resistor.
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Tuesday, August 14th, 2018 AT 3:05 PM (Merged)
Tiny
BLACKKAT
  • MEMBER
  • 1 POST
  • 2002 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 140,000 MILES
Blower doesn't work. It just started a bout a week ago. It came on when the door slamed once and hasn"t came on anymore.
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Tuesday, August 14th, 2018 AT 3:05 PM (Merged)
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
It is either the switch on the console or the blower motor itself.

Check fuses also.
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Tuesday, August 14th, 2018 AT 3:05 PM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,540 POSTS
  • 2002 PONTIAC GRAND PRIX
  • 15,000 MILES
My heater fan and lights work when my car is not running, but when I start it they do not work?
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Thursday, August 16th, 2018 AT 10:35 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I would be looking at abd ignition switch.

Roy
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Thursday, August 16th, 2018 AT 10:35 AM (Merged)
Tiny
CDORZOK89
  • MEMBER
  • 2 POSTS
  • 2004 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 103,000 MILES
When I got it the heater and air conditioner both ran perfect. One day I got into my car and went to turn on the air conditioner but the fan would not come on no matter what setting it was on. I checked the fuses and they all look fine so I took out the blower motor and it was bad so I replaced it. The fan still wont come on and I have read that it could be the relay or resistor. We checked the voltage going to the blower motor and it shows very low no matter what setting I turn the fan to. I am not sure where to locate the relay or resistor or how to check to figure out what the problem is. Could you tell me what could be causing this and how to check?
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Thursday, November 21st, 2019 AT 5:27 PM (Merged)
Tiny
CDORZOK89
  • MEMBER
  • 2 POSTS
It is manual and the temperature of the air will change according to where I set it so I can tell that my A/C and heater still work but the fan will not blow the air out.
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Thursday, November 21st, 2019 AT 5:27 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
According to my inforfmation, the only option for this car is an automatic syste. With an Autoo Temp control system, the blower speed is controlled by a blower speed control module. Both the power and ground are supplied by the module so that's a pretty strong indication that the module may be at fault.
Be sure to the the BATT MAIN 4 fuse in the underhood fuse box. It's a 30 amp.
The module will be located right next to the blower motor.


https://www.2carpros.com/forum/automotive_pictures/561653_Blower_speed_module_04_grand_prix_1.jpg

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Thursday, November 21st, 2019 AT 5:27 PM (Merged)

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