Question about 1997 Pontiac Grand Prix

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Crazy stuff going on

In order for my heater to work, fan must be turned up to 5, If lower than 5 it will not work then I have to turn it up to 5 and wait for it to kick in again which could be up to a hour after car running. Also will show Miles per hour on display instead of KM per hour if fan not set to 5. Also rear window defogger or air conditioner will not work unless heater working on 5 setting. Also problem display screen, will only illuminate if oil life low. If I have fan completely off the all signals flash as if emergen;cy lights are on I have to set fan to number 1 to shut them off. Also if I turn the fan off the headlights will go out and have to turn them on manually......Crazy

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  • gutterstars Jul 11, 2008

    I have the exact same problem. The heat will only work at 5. Sometimes, it causes the headlights to turn off also. I have so many crazy problems with my 1997 grand prix i can't stand it! I even had oil dripping out of the rear view mirror!!

  • WIZZYB Jan 17, 2009

    SAME THING ON FIVE BLINKIN HEAD LIGHTS AN WHEN ITS COLD MY CAR SAYS F U I AINT STARTIN

  • sgconsultant Feb 22, 2009

    I must admit I keep my 2003 Grand Prix pretty clean and well maintained even in Clevelands' harsh winters. And having a fully functional heating and cooling system is life or death. Recently my fan control went from operating at level 3,4,5 to 5 only. I hope when I replace the resistor I will be able to turn the radio down.

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I have a 2003 grand prix gtp more than likely it is your resistor pack which is located about center in your passenger footwell. This is actually a very common problem on W-body vehicles. I replaced mine after about 30k miles on the car my blower would only work on the 4-5 setting and eventually went out compltely. Go to www.zzperformance.com and order a replacement from them this is your best price option, as well as anythign else you could possibly need for your GP for pretty cheap. BTW the resistor pack is a royal pain in the *** to replace you wont be able to see it but rather you will lying on your back blindly shoving your hand up in the dash trying to find the two 10mm bolts that drop the resistor pack out. It took me about 2-3 hours replace only because i could not see the pack and it was super hard to get the wrench to stay on the bolts and super hard to get the screws back into their holes. Best of luck to you!

Posted on Feb 06, 2009

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There are two fuses that allow the blower motor to run. Fuse one will supply power to the resistor-pack which controls all fan speeds below HIGH. Fuse two supply's power to high ONLY. Check the fuses.
If the fuses are good the most likely cause is the resistor-pack. It's job is to send the electric-current
to blower-fan at lower "steps" matching lower fan speeds. The resistor-pack will be located either on the HVAC plenum located on the passenger side fire-wall under the hood or under the passenger-side dash board and behind the glove box. Remember to remove the negative battery terminal before attempting repairs.
NOTE: If the resistor-pack is located inside the cabin, it will be next to the blower motor and is OBLONG shaped with either one or two tiny screws and a connector with several wires going to it. You will need to use an offset-socket wrench to access the the card.

Posted on Jan 23, 2009

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We had the same thing happen. We had to replace the fan motor. It works fine now.

Posted on Sep 02, 2008

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