Question about 2003 Pontiac Grand Am

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03 grand prix heater blower only works on setting #5

Sometimes blower will come on and all functions will work but when it acts up only setting# 5 will work and no a/c sometime you can get it work if you start and shut off car and do this repeatedly and then sometimes it may just come on while driving i have already replaced blower resistor as well as blower motor is there a relay not working or sticking also noticed recently that when you shut car off you cannot remove keys related promblem or new one !

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It needs a blower motor resistor which is located behind the blower motor - this is located on the passanger side underneath the dash board...it is round and black.

Posted on Aug 02, 2009

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Posted on Jan 02, 2017

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2 Answers

2002 Pontiac air settings 1,2 and 5 don.t work on my A/C and Heater


Your blower motor resistor module has failed. You can replace it with a little effort. The cost is around $35 to $40.

Nov 20, 2011 | 2002 Pontiac Grand Prix

1 Answer

The fan on my heater/ac stop working on settings 1-4 for awhile it worked on #5 but has now stopped altogether


The blower resistor has gone out but if blower is no longer working on speed 5 then either the blower motor is bad as well or the pigtail connector to the motor are bad. Check the plugs to the resistor and to the blower motor for insulation damage discolored or melted wiring.

Oct 10, 2010 | 2002 Pontiac Grand Prix

1 Answer

The heater and a/c in my 2003 grand prix will on


Your blower motor resistor is the problem.
The blower motor resistor is located near the blower motor on the passenger side in the heater case. The resistor is held in by two screws and has one electrical connector that plugs into it. Purchase the resistor and you will know exactly what you are replacing. Good luck

Mar 29, 2010 | 2003 Pontiac Grand Prix

1 Answer

I have a 2003 GTP and at times the heater fan stops working and now the display unit quits working and it says the fuel is low but I have 3/4 of a tank


I believe that these are two separate problims. The Heater fan stops working because the blower motor resistor block is bad. This is a common problem on the 03 Grand Prix. You'll need to remove the blower and replace the resistor block. The blower is under the center of the drivers onsole.

Oct 11, 2009 | 2003 Pontiac Grand Prix

1 Answer

2003 grand prix blower control only works on 5, no heat.


you got two diff problems or more poss hvac control head, bad blower resister, bad thermostat, low on coolant, or plugged heater core

Oct 06, 2009 | 2004 Pontiac Grand Prix

1 Answer

A/C SWITCH WON'T WORK ONLY ON #5 AND SOMETIMES NOT AT ALL


If only works on highest blower speed check blower resistor.

Jun 16, 2009 | 1997 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

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