had a doctors appointment which is quite a distance from our home, got there and heater motor wouldn't shut off as i was by myself i couldn't leave car running whole time so had to run in and cancel ....very annoying since it takes two months to get in... but what else would i do couldn't take chance battery would go dead who knows how long i'd be and couldn't leave running with keys, although at the time i could of cared less if someone stole the piece of crap at that time...but now after going on here i see it's a common problem with these cars, why has there been no recall on them, guess we have to wait till one catches on fire i guess...but now i know to replace the resistor thanks to your forum i'll save a garage bill......

I bought my 2004 ponitac grand prix 2 years ago from vission dealer. I noticed a couple of months later that the floor board was wet. So i took it back to the dealer and they told me that it was from a system that my husband had gotten installed in the car. Which was a bunch of bull.. Now today when i got off of work i went to start the car and the blower came on on high. I didn't know what happened but when I went to turn the car off the blower stayed on. What to do? I don't know! Any suggestions> kinder725@yahoo.com

I see this is a common problem and I'm pissed since i just bought the car used 4 days ago..started w a bunch of blinking of the panels when i shut off the car..for the first 3 days i noticed my battery was acting up and almost couldn't start the car a few times cause i have a older battery and knew i had to replace that. but today i went to gas station shut off car and the blower kept running nothing worked to shut it. I then could not start the car the battery was drained..took to a friend he thinks its the relay switch..so he said take to the place i bought it and see if they will make things rite..I'm hoping the warranty i got for 1 yr will cover it..its a cars protection plus warranty. if anyone can give me sum thought on how to handle this w the same dealer i bought it from please give me a response..I'm a female ontop of it!

Since I'm not the only one with this tale, I shall share mine. Back in `09, after hitting roughly 80k in miles, I had my car's fluids flushed and filters checked. And this is where I think the problem originated. After the "technician" checked the air cabin filter, I started to notice after it rained that a puddle was forming inside the cabin of my car. For the longest time, a month or so, I couldn't figure out why. Then I did a routine oil change and noticed that the cowl and the 2 ft. rubber seal that goes under it weren't properly placed. After fixing what I could of it, the water stopped but not long after the blower motor wouldn't shut off. I took it to the dealership I bought it from and they replaced the motor, for a fee. All was well, until winter hit and then the motor gave out again. Does anyone know how much of a pain in the neck it is to remove a battery cable in the middle of a Michigan winter? Probably so. Instead of taking it back to the dealership, as I was unsatisfied with their work, I went to my local auto parts store and asked them. They told me the resistor was likely bad. I got one of them, and as I was changing it out, I noticed that the old resistor had corrosion from all the water that leaked into my car. Thoroughly pissed off, I changed it out and life went back to normal. Fast forward to 2 weeks ago. Shortly after our first good snow storm, what should happen? The SAME DAMN THING! YOU WOULD THINK AFTER 6 YEARS OF COMPLAINTS, GM WOULD GET OFF THEIR BUREAUCRATIC DUFFS AND DO SOMETHING ABOUT THIS!!!!! But no, instead of posting a recall on it and admitting they f*&%ed up, they just closed down Pontiac's line of cars and took vacations. Then they have the nerve to go to Congress and ask for taxpayer money to save their business? I don't F*&%ing think so!

So now, as a temporary solution, I simply unplug the blower motor each time I get out of it. Yeah it's an inconvenience, but at this point, it beats throwing money away. Maybe in the summer I will see about taking some silicone adhesive to the warped cowl and the rubber seal, to permanently keep it in place. And what really gets me, is that my wife owns the 05 Grand Prix, hasn't had a single problem with it. Ain't that a b@*&#?

I have a 2004 Pontiac Grand Prix GTP. The AC/Heat will only work if the fuse put in (under the hood), then it runs only on HIGH. The control knob can be turned off completely and it still runs oh high. It will run even if the car is off and the keys removed. If the fuse isn't removed,the fan will run all the time causing the battery to die. I'm at my wits end and can't afford a diagnostics estimate, let alone some sort of huge expensive replacement. Also when it rains, there a puddle of water on the passenger side floor that looks like it's coming from underneath the dash!! We ought to have a CLASS ACTION LAWSUIT! This can cause black mold, which can be DEATHLY!!

I had bought the car for my wife used.one day after i bought it the blower motor would not shut off when i had the car turnede off so i called the dealer and told him and he said i bought it "as is" no warranty. i had to get it fixed so i took it to a mechanic and he said he would put a new resister in and a control module for 625 dollars so i bought the control module from a salvage for 40 dollars it did not fix the problem. then i bouhgt a blower motor resiter for 75 bucks brand new from napa i put it in myself promblem solved!

the resistor is under your glove box take the panel off there is two wiring harness under there the big one is pluged in to ur resistor closest to the fire wall. unplug it pull out the two rivets holding it in buy you a new one. plug it in screw it down smile and relax. promblem solved if u have any questions email me. my name is daniel

As you can imagine, I'm very upset that this problem keeps happening. I don't know if it's something else that causes these resistors to continue to mess up or it's the store I got them at (Advance Auto). PLEASE HELP!!! This is getting very expensive. Who wants to have to unhook the battery cable every time they need to run somewhere!!!!!!!!!!!!!!!!!!

Update from Sep 22, 2009: On September 18th, I went to a GM Dealership and bought a new heater motor for ($120.69) and a heater module for ($63.34). I got a local mechanic to install both of these in my car (it took about 25 minutes) and he only charged me ($20.00). Right away, I noticed that the noises that had been continuing when I only put in the module were gone. I don't know if it was the heater motor or the module I had been getting from Advance Auto. I think it was probably the heater motor. I'm hoping this fixed the problem, so I also hope you don't hear from me again.

I am so pissed off I always wanted a grand prix finally got one. I left work today and realized my fan was blowing at top speed when I turned it off I realized it wasn't on. I got home at 11pm and in my garage started pulling fuses until I got it one that turned it off. WTF how much is this B/S going to cost to fix !!!!! With the car completely off fuse out I put the fuse back in and the fan started right back up. They just don't make cars the way they used to. Is this the relay stuck does anyone know tell me so I can fix it my damn self. !!!!!

I come home after working a long week at Fort Dix and I had to return the rental car back to BWI when I hop in my car to run my coworker to the airport i turned on my A/C and begin driving not thinking about anything until i was going down I95 and realize that my blower was blowing at full blast and i had it turned up two notches and I was like ok and then I turned it off and it was still blowing! So now im pissed!!! So I had thought that maybe i could remove a fuse to keep it from running down my battery and that didn't work either so at that point i removed the negative terminal and shut it off and then out of curiosity i connected it again and it begin blowing! SO NOW im really mad because it now said theft system disabled my starting of my vehicle! SO NOW I CAN"T START MY CAR....ughhhhhh!!! WTF NOW!!!! So i tried to see if I was able to get into my DIC but no luck and the damn manual didn't help a damn bit so now that damn factory theft system disabled my car and i also noticed that it was spitting out SERVICE ABS, SERVICE THEFT SYSTEM, SERVICE BRAKE SYSTEM, CHARGING SYSTEM FAILURE, and so forth and those have never come up before! I serviced my brake 4 months ago so now im like HOT under the collar because this is total bulls**t!!! Now I come to this site and read this and it totally made me even madder that this could have been a recall and taken care of by GM but now I see why they are bankrupt and in trouble with the consumer! That makes me positive that I won't EVER buy another GM vehicle in my life again! Consumers are usually right and if you don't cater to us then risk going out of business!