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Heater blower not working

Tiny
MICAH6877
  • MEMBER
  • 2004 PONTIAC GRAND PRIX
Heater blower working only after hitting the dash. But finally quit. Fuse for Hvac is good. Got any good ideas, where next? Blower resistors or blower motor? Seen like a common problem.

Thanks
Sunday, February 7th, 2010 AT 11:29 AM

59 Replies

Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
It sounds like the blower motor has gone out but to be sure here is a guide that will show you how to test for power and ground at the blower motor and how to replace it.

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only

Please let us know if you need anything else to get the problem fixed.

Cheers
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Sunday, February 7th, 2010 AT 12:28 PM
Tiny
HOUGHTY18
  • MEMBER
  • 3 POSTS
  • 2004 PONTIAC GRAND PRIX
  • 50,000 MILES
A few months ago my blower for my a/c started to only turn on when I would hit a bump or travel over 60 mph. Now it will not turn on at all. Also, before all of this started, there was a static noise coming from the passenger side of my car that would come on and off when I hit a bump. It would remain on even when I turned the car off. However, this static noise stopped when I started having the a/c issue. Is this an electrical problem? Is it expensive to fix?
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Tuesday, August 14th, 2018 AT 3:02 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Do you have an Auto Temp Control system?
You did say that there was a period when it would still run with the key OFF, right?
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Tuesday, August 14th, 2018 AT 3:02 PM (Merged)
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Hi
sounds like it could be a blower motor going out/worn out. Do you do any work on cars yourself or family?
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Tuesday, August 14th, 2018 AT 3:02 PM (Merged)
Tiny
HOUGHTY18
  • MEMBER
  • 3 POSTS
The static noise is what stayed on with the car off, not the a/c. No there is no auto temp control. The static noise might have nothing to do with the a/c problem. I just thought it might be helpful.
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Tuesday, August 14th, 2018 AT 3:02 PM (Merged)
Tiny
HOUGHTY18
  • MEMBER
  • 3 POSTS
My dad can work on cars. He's not a professional but he knows his way around.
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Tuesday, August 14th, 2018 AT 3:02 PM (Merged)
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Blower is on pass side under dash check the wiring for melt/burn/corrosion and if ok test plug for voltage and if ok test blower by removing and applying 12 volts from battery.
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Tuesday, August 14th, 2018 AT 3:02 PM (Merged)
Tiny
*****LIVELAUGHLOVE*****
  • MEMBER
  • 1 POST
  • 2004 PONTIAC GRAND PRIX
Heater problem
2004 Pontiac Grand Prix 6 cyl Automatic 103000 miles

I live in wyoming and the winters are very cold around here. I drive a 2004 Grand prix gt. I went and washed my car and it was probley in the 20 degree range outside. Maybe an hour or so after I washed it my heater all the sudden wouldnt come on. It wouldnt blow any hot air or any air at all for that matter. Could my blower motor be frozen up from washing my car in such cold weather? Or could it be a fuse? I need help
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Tuesday, August 14th, 2018 AT 3:02 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Find the blower motor -turn heater on bang on the blower motor a few times-did it come on if not could be fuse/blower motor relay/control switch/HVACcontrol module/motor control processor/ and motor itself.


https://www.2carpros.com/forum/automotive_pictures/12900_blower_14.jpg

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+1
Tuesday, August 14th, 2018 AT 3:02 PM (Merged)
Tiny
FIREFIGHTERLT1
  • MEMBER
  • 1 POST
  • 2004 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 98,500 MILES
I have a 2004 Grand Prix that the heater blower does not work. The car is warmed up and all of the fuses look ok.
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Tuesday, August 14th, 2018 AT 3:02 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Welcome to the forum, I'd have to get at the blower motor connector. With key and hvac turned on, check for voltage and ground at the connector. If that checks out, I suspect a faulty blower motor. Any fuses you check, use a testlite on the fuse circuit, make sure the circuit is hot.
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Tuesday, August 14th, 2018 AT 3:02 PM (Merged)
Tiny
AJMOSES
  • MEMBER
  • 1 POST
  • 2004 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 72,300 MILES
My blower fan does not work(for ac or heat) I hear it, it just doesn't blow. It used to start working again when I pounded the dashboard, now it does not. Where is this heater box duct? Also, to check for 12 volts of power, how do I do this?
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Tuesday, August 14th, 2018 AT 3:02 PM (Merged)
Tiny
CRZYDRVR
  • MEMBER
  • 432 POSTS
Try the heater control module.
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Tuesday, August 14th, 2018 AT 3:02 PM (Merged)
Tiny
BRUCEMAY
  • MEMBER
  • 4 POSTS
  • 2004 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 59,000 MILES
A/C Heater blower motor not working at any speed
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Tuesday, August 14th, 2018 AT 3:02 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Check batt main fuse 4-- 30 amp, in the underhood fuse box. Use a testlite, the circuit should be hot all the time. If that checks out, I'd have to get at the blower motor connector and check for voltage and ground.
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Tuesday, August 14th, 2018 AT 3:02 PM (Merged)
Tiny
BRUCEMAY
  • MEMBER
  • 4 POSTS
Fuse tested ok and voltage at circuit. How do I get to blower motor?
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Tuesday, August 14th, 2018 AT 3:02 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Should be under the passenger side dash. I don't have a picture.
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Tuesday, August 14th, 2018 AT 3:02 PM (Merged)
Tiny
WENDELLVT
  • MEMBER
  • 2 POSTS
  • 2004 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 75,000 MILES
The blower fan works intermitantly. When it is not working, if I hit the right side of the center dash (where the controls are located) it starts working. It also starts working if I hit a bump or pot hole. If it is the control module (contains 3 dial switches and the rear dfrost and air conditioner button) is there any way to test it?
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Tuesday, August 14th, 2018 AT 3:02 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Welcome to the forum. Have all trouble codes checked, see if anything points to the hvac system. I'd get at the blower motor connector, everything turned on, check for voltage and ground. If no voltage, I backtrack the circuit. Test when the blower refuses to run.
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Tuesday, August 14th, 2018 AT 3:02 PM (Merged)
Tiny
WENDELLVT
  • MEMBER
  • 2 POSTS
Trouble codes ok. No voltage when blower not working.
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Tuesday, August 14th, 2018 AT 3:02 PM (Merged)

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