Thread: Frustrated - Changed Blower Motor Resistor and same problem. - Need Advice

I changed the blower motor resistor on my sons 2003 Grand Prix GT. What a pain in the ass. Especially after you struggle through it and get it changed and it does not fix the problem. The unit only works on 5. Where do I go next? I am thinking it is the manual dual climate controls. I have a line on a used one but my question is will that fix my problem? How do I change that out? How do you get the plastic moldings off around the controls? I am frustrated and could really use some good advice on this.

Check your fuses. Chances are you have a blown one.

Even if the fan still works on speed #5

Yes...there are two fuses for the HVAC...GM had some brilliant ideas.

Thanks - I will check that tomorrow.

No problem. I believe the culprit in which you seek lies in the fuse box under the hood. I may be wrong, but the fuse for speed 5 I think is in the glovebox...might have those backwards.

Could be #29 under the hood - Remote Keyless Entry, Theft Deterrent, Trip Computer, HVAC Module, Security LED or it could be one of these two in the glove box - HVAC Control or DIC/HVAC. Not this one HVAC HI as that seems to work.

there you go...you'll find it.

Well it was not any of those fuses - any idea where I should look next?

Is anything else also not working?

Not that I can see - On the dual climate control when I push on the rear defrost - the light does not come on, same when I push the A/C button. Fan only works on 5 setting and the heat works and the knob to change the blower position works fine.

Any other systems in the car not working...radio, DIC, etc?

Everything seems to be working

OK so now I am super frustrated - I changed the control unit and it still does the same thing. Fan does not work on settings 1-4. I am at my witts end here as Ican not seem to fix this problem. Any other thoughts or ideas?

i too am having an issue kinda like this only it runs all the time... even with the key off anyone have any ideas? i replaced the transitor and it worked normal again and the other day my girl friend drove to work and had the whipers on and the heater and its back to staying on all the time

Brand new AC Delco part. How would I test the wiring harness to see if that is the problem?

i also bought a new one as well

i found this i dunno if it helps becuase yours is an 03 GM Service Bulletin No.: 05-01-39-001A

Subject:
Blower Motor Inoperative or Intermittent, Blower Speed May Drop or Blower Continues to Run After Key Off (Install a Capacitor at Blower Motor Control Module Connector)

Models:2004-2005 Pontiac Grand Prix

Condition
Some customers may comment on an inoperative or intermittent Heating, Ventilation and Air Conditioning (HVAC) blower motor. Others may comment that the blower motor speed may momentarily drop or that the blower motor continues to run after the key is turned off.

Cause
This condition may be caused by a voltage spike from the wiper motor. The voltage spike may cause a logic lock up in the blower motor control module that may be either momentary or permanent.

Correction
Install a capacitor at the blower control module connector.
DO NOT replace the blower control module, blower motor or the HVAC Control Head