04 grandprix blower will not shut off

[firetbabe]

Has anyone else had a problem with the blower not shutting off? Even when you remove your key from the igintion the blower keeps blowing out air and I can not controll the air flow, even when the car is on, like it it stuck on high.

I have to unplug the battery cable to get it to shut off.

Does anyone know of a fix for this problem?

[BNaylor]

This problem is a carry over form the '97-'03 models. You have a bad blower motor control module. The fan hi-speed relay is located on this module and has battery power at all times regardless of the ignition switch. It will kill your battery sooner or later.

[firetbabe]

It rained all yesterday afternoon into the evening. When I unplugged the blower about a 1/4 cup of water came streaming out of the bottom of the blower. I am affraid that my problem may be more serious than what I thought. We were going to replace the module as you suggested but now with water in the blower I am not so sure what to do next. Do you have any ideas as to were the water is coming from?

[BNaylor]

First check the HVAC drain hose and make sure it is not clogged and connected properly. Next remove the plastic intake cowling which should be passenger side below the windshield and inspect for bad or missing rubber seals. Also, see if you have a cabin air filter installed.

[firetbabe]

Thank you for all the advice. We have several days of rain so the first chance I get hopefully soon I will check these things and get back to you. If you think of anything else please let me know.

Fire

[dscglfgeo]

Yes!! i am having the same problem in my 04. it just started over the weekend. I've been trying to find info online about it when i found this.

BNaylor, I heard it might be the blower motor resistor. do you know if this could be right? Any idea how much the control module is?

[BNaylor]

Originally Posted by dscglfgeo

Yes!! i am having the same problem in my 04. it just started over the weekend. I've been trying to find info online about it when i found this.

BNaylor, I heard it might be the blower motor resistor. do you know if this could be right? Any idea how much the control module is?

In the '04 and up models GM changed the design and name to blower motor control module so it is not called a blower motor resistor like the '97-'03 models. GM list is around $75.59.

Send me a PM with your regular email address and I can provide an AC Delco parts source where it will be cheaper.

[05grandprix]

I have replaced the motor twice and they work to start but then seem to stop working? could the motors be bad or is it the resistor?

The motor used to work after tapping it then stoped working all together.

^new motor installed^

The motor worked fine then just stoped working, now the motor "ticks" As if it get jaunts of power only for a moment and the fan will spin again for 1-2 sec. then stop and tick again.

The ticking coinsides with the blower setting.
low- tick.................tick................. tick

high- tick....tick....tick....tick...

Any thoughts?
Thanks!!!

[brian 1]

all the problems you describe,fits this bulletin #1644694 you have to install a blower Capacitor.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.
<A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1644694&psdid=422&evc=sm#ss2-1644694">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.
<A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1644694&psdid=422&evc=sm#ss3-1644694">Correction

DO THIS
DON'T DO THIS
Install a Capacitor at the Blower Motor Control Module Connector
DO NOT replace the Blower Motor Control Module, Blower Motor or the HVAC Control Head
Technicians are to install a capacitor, P/N 25073556, at the blower motor control module connector using the following procedure:

1. <LI type=1>Disconnect the negative cable from the battery. Refer to the Battery Negative Cable Disconnect/Connect procedure in the Engine Electrical section of SI. <LI type=1>Remove the right closeout/insulator panel. Refer to the Closeout/Insulator Panel Replacement-Right procedure in the Instrument Panel, Gages and Console section of SI. <LI type=1>Disconnect the wire harness connector to the blower motor control module.
   
   
   <LI type=1>Install a capacitor, P/N 25073556, into the blower motor control module connector using the following steps. Refer to the illustration above to locate the positive and negative leads of the capacitor. Refer to the Splicing Copper Wire Using Splice Clips procedure in the Wiring Systems section of SI (Document ID #303646) for more information on using splice clips.
   • Strip a short length of insulation from the red wire in cavity C, circuit 442, of the blower motor control module connector. Using a splice clip from the J-38125 Terminal Repair Kit, crimp the positive lead of the capacitor to the red wire.
   • Strip a short length of insulation from the black wire in cavity A of the blower motor control module connector. The circuit number for Buick vehicles is 1450 and for Pontiac vehicles it is 150. Using a splice clip from the J-38125 Terminal Repair Kit, crimp the negative lead of the capacitor to the black wire.
   • Solder both crimp connections.
   • Cover both crimp connections with electrical tape.
   • Tape the capacitor to the blower motor control module wiring harness and cover it completely with electrical tape.
   <LI type=1>If the customer concern was of a blower motor that continues to run after key off, then replace the blower motor control module and install the capacitor . Refer to the blower motor control module Replacement procedure in the HVAC section of SI. This condition is the only time you need to replace the blower motor control module. <LI type=1>Reconnect the blower motor control module connector. <LI type=1>Install the right closeout/insulator panel. Refer to the Closeout/Insulator Panel Replacement-Right procedure in the Instrument Panel, Gages and Console section of SI. <LI type=1>Reconnect the negative cable to the battery. Refer to the Battery Negative Cable Disconnect/Connect procedure in the Engine Electrical section of SI.
2. Verify proper operation of the blower motor.

<A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1644694&psdid=422&evc=sm#ss4-1644694">Parts Information

Part Number
Description
Qty
25073556
Capacitor 330UF, 50V
1
i would check this first.i have done a few of these with this problem

[brian 1]

does anybody know how to shrink the picture down,any info would be helpful.

[05grandprix]

Ok, So I hooked the blower motor up to a 12V battery and it worked fine, its not the motor.

Next, I took off the control resistor and opened it up. I saw that all of the connectors that were soldered to the computer board were corroded I used some electrical cleaner and wire brush to scrub it clean. I plugged in the resistor and then the motor and the motor started spinning at a VERY high speed eventhough the car was off and no key, etc.
-------------------------
No I just saw that most recent post about a capacitor. Where can I get one? Only at the stealership?
Also, I cut off the red and black leads to the blower resister and add a capacitor to each? then reattach to the relay? If I could be shown a "repaired photo" It would help emmensely.

Thanks again,

Zach

[brian 1]

the capacitor is dealer only part.part number is 25073556.when you install it you skin back a small section of the black wire an d small section of red wire.your putting the capacitor fron the black wire to the red wire.make sure you solder it in,very important.i dont have a picture,but look at the picture of the bulletin i posted.that should help.you are taking the capacitor and putting it inbetween the wiring at blower control module.

[05grandprix]

Ok, looks like I'm heading to the dealer ASAP, any idea of the cost? $2??? ha ha

[brian 1]

cant say,i havent done any of these in along time.

[05grandprix]

I'm wondering if a new resistor will be needed too??? It seems that its messed-up as is?? I'll give it a shot though. (just something to add to my list)

Monday -sister crashed her car
wendsday- alternator went in the mercades
friday- blower went on the Grand prix
today- my tumbler went on my car ... WHAT THE HECK???

NO JOKING!