Question about 2002 Pontiac Grand Prix

1 Answer

2002 pont. grand prix-Heater/AC Only works on High

Heater/AC Unit only works at the highest speed of 5. Is this an easy fix or do you have to go to the dealership?

Posted by on

  • carol_wilson Jan 15, 2009

    The information appears to be perfect as I spoke with a few electrical engineers I work with and they agreed with the solution of the resistor. I have ordered it and the electrical engineer will put it in for me for $20. save me about $130 bucks from the dealer. It will take a couple of weeks to get the part. I will let you know when its done.



1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert that has over 500 points.

  • Expert
  • 233 Answers

You need a new speed control resistor... this is something you will have to get from the dealer, but you should be able to replace it yourself - it is under the dash on the passenger side mounted near the bottom of the fan motor.. you will remove a couple of screws, and it will come out of the black casing it is mounted inside.

Posted on Jan 12, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

2000 grand prix, temperature won go from ac to heat, stuck on ac.

Pontiac Grand Prix Climate Control/AC - Car Forums at > Pontiac > Pontiac Grand Prix
Dec 29, 2007 - 30 posts - ‎20 authors Hi Joe, I had the same problem with no heat on my 2000 grand prix. .... motor and the exterior temperature sensor have both been replaced ... Pontiac Grand Prix Electrical/Lighting
30 posts
Aug 3, 2009
Pontiac Grand Prix Heater blower relay switch
30 posts
May 13, 2009
Pontiac Grand Prix Starting / Stalling Issues
30 posts
Feb 9, 2008
More results from

Fixing AC Temperature Control on my 2002 Pontiac Grand ...

? 9:58

Jul 13, 2014 - Uploaded by Turbo231
Fixing AC Temperature Control on my 2002 Pontiac Grand Prix... How To Install Replace AC Heater ...

Oct 15, 2015 | 2000 Pontiac Grand Prix SE

1 Answer

Heater fan only runs on high speed not the middle settings

Follow the 2 wires back from the motor under the dash. The speed controller is the fault. It's default when it fails will allow for high speed operation only. The unit that the 2 wires come from is the controller. Replace that unit.

Feb 12, 2011 | 2002 Pontiac Grand Prix

1 Answer

Heater blower motor only works on high on 2002 pontiac gran prix se-instructions on diy replacement i have the part. Heater Fan works occasionally on speed 5 only. When it doesn't work at all the lights...

for the fan blower motor it could be the resistor or the fan control speed control switch is bad.for no lights replace the DRL RELAY for the lights. for the heated seats check the fuses.

Jun 01, 2009 | 2002 Pontiac Grand Prix

2 Answers

2000 grand prix fan speed

i have been having that same exact problem with my 2002 grand prix for over a year now, and when my ac is on the lower setting the it doesnt work plus the headlights and lights on my dash go out. On Max everything works. i changed the blower resistor(about $35), still doesnt work. i changed all relays and fuses related to the ac, still doesnt work. i changed out the actual ac control switch in the dash, still doesnt work. i have changed everything but the blower motor and have asked every mechanic and auto parts retailer i come across and no one knows the answer. The best answer i got is that it is probably a wiring problem like a short somewhere.

May 28, 2009 | 2000 Pontiac Grand Prix

1 Answer

Blower control on heat/ac only works on highest level.

Your blower motor resistor, located under the passenger side dash down by the floor next to the blower motor, This will cause the motor to only work on high speed. Gm pt#89019101 around $60

May 11, 2009 | 2002 Pontiac Grand Prix

1 Answer

Blower works on 5 only

I don't claim to know why the lights are affected but when a heater blower only works on the fastest setting, it is normally due to the failure of a stepped series resistor which has taps to set the different speeds.
As emissionwiz stated, that is the most common cause.
This resistor may be mounted on the firewall under the hood or near the blower motor. 
Without an electrical diagram at hand, I can't say for sure but there may be a relay failed that bypasses the resistor completely when set on the highest speed or diverts the current through the resistor. 

Mar 16, 2009 | 1997 Pontiac Grand Prix

1 Answer

The blower fan speed control stopped working

usually a bad blower resistor is at fault...

Feb 05, 2009 | 2002 Pontiac Grand Prix

2 Answers

AC/Heater on 2002 Grand AM SE1 will only work on one speed

chk. to see if you got a heater resister, it should be somewhere in the visinty of the blower motor 2 screws hold it in the heater box and it will have 4 or 5 wires in a plug going to it. samething happend with my truck and thats what it was. i also found out sometimes that plug with the wires to the resister burn, if thats the case you will have to chg. that too.

Jan 12, 2009 | 2002 Pontiac Grand Am

1 Answer

Heater motor only runs on high

Replace the heater blower resistor.

Dec 26, 2008 | 2002 Pontiac Grand Prix

Not finding what you are looking for?
2002 Pontiac Grand Prix Logo

431 people viewed this question

Ask a Question

Usually answered in minutes!

Top Pontiac Experts


Level 3 Expert

77499 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8825 Answers

Are you a Pontiac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides