Question about 2002 Pontiac Grand Prix

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My A/C blower only works on high and at times the lights go off when the blower will not work.

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It is easy to access the blower, on the pass side under the glove box is a panel with 2 small screws to remove. The panel will come down and out to access the blower and the wires to it. first check the plug on the side of the motor it locks with clips right on to the side of the motor. move that plug around to see if it is a loose plug or wire. one fix is to use a plastic tie and pull the wires tight forward or to you and tie them in place. if you close the pass. side door hard and the fan and the lights come on, this fix may fix it temp. but it is getting time for a new fan motor.

Posted on Aug 25, 2010

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The most likely cause for your concern is a bad blower motor resistor pack. It's located above the front passenger footwell in the dash. You may have to remove a hush panel to gain access to it. It's secured in with two small screws. It's usually a dealer only item and runs about $40.

Posted on Aug 25, 2010

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Blower Motor Not Working properly


check "amp" at the blower motor! if the "amp" its to high , you better replace the blower motor! It will damge your blower control module soon also!!

Mar 15, 2016 | Cars & Trucks

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Blower motor does not work?


Blower motor problems are a pretty common topic. This is a basic guide on how to diagnose the problem and will work for most vehicles.

The diagram is generic and loosely based on GM's setup and more specifically a Silverado. Most manufacturers have a similar setup and the only major differences would be a ground side control (instead of the switch supplying power to the resistor it would be grounding the power from the resistor if this is the case you test light would need to be connected to power to test the switch) and late model Chrysler minivans (they use a module that looks for a difference in a/c voltage from the switch)

If the blower works on high only than likely the resistor assembly is the culprit since power to the blower essentially bypasses all of the resistors and/or the resistor assembly entirely. The reason why none off the other speeds will work is that the resistor or the circuit for the speed four setting has burned out. The lower the setting the more resistance you need to drop the voltage to the blower. The first speed setting requires all four resistors to drop the voltage enough to turn the blower at its slowest speed. Speed 2 needs to turn the blower a little faster so it uses three resistors. Speed 3 uses two resistors and speed 4 uses one.

In some cases the fan will work on high and speed setting 4. The likely cause for this is the speed 3 resistor or circuit has burned out. Speed 4 still works because it doesn't use the lower speeds resistors to control the speed of the blower. If the speed 2 resistor burns out than speed 1 and 2 will not work but 3, 4 and high will continue to work. If the speed 1 resistor burns out than speeds 2, 3, 4, and high will continue to work.

This leads us to how do we know if its the resistor or the switch or the blower. If the blower works on high than we know the blower works. That leaves us with either the switch or the resistor assembly (there are many other possibilities) which can be easily tested with a test light (or a voltmeter if you choose) The first thing to do is locate the resistor assemble. They can be behind the glove box, under the dash close to the blower motor or under the hood, again usually close to the blower motor. It will typically have 5 to six wires going to it. We'll start by unplugging the connector, turning the key on and connecting your test light to ground.

1.Turn the switch to high and backprobe all the wires. Two of them should illuminate the test light. In the diagram below this would be wire E & F. If you don't have a diagram then hold the test light on one of the two wires and move the switch to another speed setting. the wire that continuously illuminates the test light regardless of the switch position will be the constant power for high blower speed and will not need to be rechecked in the following steps.

2. Turn the switch to the next lowest setting. Backprobe the remaining wires to see if one of them illuminates the test light. Repeat until you have checked all of the speed settings.

3. If the test light has illuminated a different wire for each setting then we can reasonably assume that the switch is functioning as intended and the source of the problem is the blower resistor.

If you find one or more settings (but not all the settings) on the switch that does not illuminate the test light on any wire than we can reasonably assume that the switch has failed.

There are a few other things that can cause blower motors not to work as intended. The switch or the resistor assembly are the two most common problems.

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on Oct 26, 2010 | Chevrolet Venture Cars & Trucks

1 Answer

97 Isuzu Rodeo Blower Fan


sounds like it`s in the swich in the dash.

Feb 18, 2013 | 1997 Isuzu Rodeo

2 Answers

My heater isnt blowing out any hot or cold air how do i fix problem if i hit blower motor sometimes it will kick on but onlt on high


The blower motor needs to be replaced. Also if it only blows on high the blower motor resister block may need to be replaced as well.

Feb 25, 2010 | 1997 Chevrolet C1500

1 Answer

My blower for the heat comes on when it gets ready. Most of the time it is not working. Where do i start?


you need to check it when it takes one of its fit and don't work,using a test light turn key on and blower fan switch on high,now go to blower motor with a test light ,should be under and behind glove box,check the wires going to blower for voltage,it will only have two wires,one hot and one ground.,if your test light lights,replace motor,if no power replace resistor

Jan 12, 2010 | 2000 Pontiac Grand Prix

1 Answer

My heater only work on high and will not blow out defrost


IF THE BLOWER MOTOR ONLY WORKS PN HIGH THEN YOU NEED TO REPLACE THE BLOWER MOTOR RESISTOR LOCATED ON THE SAME HEATER BOX AS THE BLOWER MOTOR

Jan 08, 2010 | 2002 Pontiac Grand Prix

1 Answer

My heater is not coming on turning blower switch off lights go on


I have the same problem. Headlights go out and blower doesn't work on 1-4.  5 or high is on a separate circuit, bypassing the resistor.  I replaced a bad resistor once when 1-4 didn't work and it fixed the problem, but, it wasn't effecting my headlights then.  I replaced the resistor and blower motor this time, lights and blower still don't work on 1-4.  I'm going to try the switch next. If it's not that, must be a resistor wire grounding out. let me know if you find out first.

Jan 06, 2010 | 1997 Pontiac Grand Prix

1 Answer

Air blower will only work on the high side. All


I believe there are TWO fuses for the blower. One for lower speeds and one for high speed only. Check your owners manual for the location of BOTH of these fuses. Check and replace if blown. Does anything else not work (i.e. interior lights, cigarette lighter...?) they could be on the same circuit.

Nov 21, 2009 | 2005 Toyota Tacoma

1 Answer

I have a chevy colorado. only the high spped fan works. there are no indicated fuses for the fan system what can the problem be


TRY THE BLOWER MOTOR RESISTOR FIRST. POWER GOES THROUGH THE BLOWER THEN TO THE RESISTOR AND THEN THE CONTROL MODULE TO GROUND.

THE RESISTOR IS ON THE BOTTOM OF THE HEATER CASE ON THE PASSENGER SIDE. USING A TEST LIGHT ATTACHED TO GROUND TOUCH EACH OF THE TERMINALS ONE AT A TIME WHILE SWITCHING THE POSITIONS ON THE BLOWER CONTROL. IF THAT WORKS YOU WILL HAVE A LIGHT FOR EACH WIRE IN EACH POSITION ON THE DIAL. THE RESISTOR IS THE PROBLEM THEN.


RESISTOR WIRE COLORS
LOW = YELLOW
2 = TAN
3 = LIGHT BLUE
HIGH = ORANGE

RATE ME, PLEASE

Jul 04, 2009 | 2007 Chevrolet Colorado (Extended Cab) New...

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