Question about 1997 Jeep Grand Cherokee

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Heater blowere shuts off at the highest setting

My blower works on the 3 lower speeds but totally shuts off when i move it to the highest position. Not sure why.

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Heater blower motor risister most likely cause. should be under dash near heater motor.

Posted on Jan 16, 2009

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1990 Corolla: Air/heater switch works only when set to the highest speed.


Take it apart and clean it out as much as you can. Cleaner ( like lysol spray?) may help. Take the blower motor out-that should be easy to get to-and clean out that cavity.
It is the resistor pack, not the switch, for the blower speed problem. See if you can take the glove box off or out. Look for the resistor-it is somewhere on the heater case, and easily replaced. Only one or two screws that hold it, and the electrical connector, and it's free.

May 26, 2012 | 1990 Toyota Corolla

1 Answer

The heater fan on my 1993 f-350 has become really loud. I only have hi speed which I understand may be a resistor issue but how do I remove the fan and motor assembly to inspect it?


A heater blower motor resistor is an electronic device with three or more progressive resistors that allow the heater blower motor to operate at slower speeds. The highest speed of the heater blower motor is not controlled by the resistor, so when the resistor fails, the fan will often work on the highest speed setting, but not the lower speeds.
To resistor is generally located under the dashboard and under the hood, near the blower motor . The resistor's electrical connector is disconnected, the resistor is removed and the new resistor is installed. On some vehicles it may be easily accessible, and on others it may take partial dashboard removal to replace the resistor.
Look under the hood, generally the wiring for the Blower resistor is attached to the wiring to the blower motor itself
It's inboard & below the motor, near the accumulator. You can see it standing beside the passenger fender. it's the off-white connector behind the L heater hose above the vacuum reservoir & the white WARNING sticker

Feb 12, 2011 | 1993 Ford F350

1 Answer

Honda Accord 2002 heater blower control works only in the high position. The 1, 2, and 3 positions do not work but the high (4) does.


The heater blower is normally controlled by voltage sent to the blower via a resistor network.
In this case it seems that this unit also called the fan resistor is defective.
I assume that 4 is the position where the blower is running HIGH and in this position the blower is powered directly without using resistor for lowering the speed of the blower. In step 1 - 3 the blower is powered via the mentioned resistor network.

In my opinion the resistor network is defective.
Replace it !!!!.

Jan 31, 2011 | 2002 Honda Accord

1 Answer

2005, Grand marquis, aircondition works on max or regular AC setting, but fan only works on the highest setting, will not work on slower fan speeds


this is a smiple repair, replace the blower motor resistor, this is what controls the lower speeds and is very common,the resistor is locate in the heater box next to the blower motor.

Jul 15, 2010 | 2005 Mercury Grand Marquis

2 Answers

Fan does not work in position 1 2 3 works great in position 4


From the scenario that you have just described; more than likely your blower motor resistor pack has failed. On the highest setting, the blower motor will have no resistance from the resistor pack allowing the motor to turn the fan at full speed; however, on the lower speeds, the different resistors are what create your different speeds by varying resistance in the electrical circuit.

Jun 15, 2010 | 2001 GMC Sonoma Extended Cab

1 Answer

I have a 2002 Cherokee Jeep CRD. When I turn on the heating, I have to turn it round to the highest level 4 to make it work. 123 do not work. do I have to buy a new unit


I am guessing that you are referring to the blower motor not moving air till the highest setting? If that's the case, there is a blower motor resistor part that handles voltage for all lower speeds. You can usually change this part without too much trouble. They're usually priced very reasonable from the dealer. Once you have it in your hand, you can look for it screwed into the heater case.

Jan 15, 2010 | 2001 Jeep Grand Cherokee

3 Answers

Heater blower motor control speed is not working


Check on the outside/ under the hood. on the passenger side of the firewall there is a flat board whitish in color carfully pull that off and make sure all the connectors look clean this is the cheap way out.

Aug 14, 2009 | 2003 Chevrolet TrailBlazer

3 Answers

Subject: 2004 isuzu rodeo...my ac/heater blower is not working


The resistors are in circuit only on the lower fan speed settings.
On the highest speed setting, power is switched directly to the fan motor.
Check fan power supply fuses,
Check power is available to the fan when high speed selected.
If all above OK, apply power directly to the motor to verify fan motor runs- if it doesn't the motor may need replacement/repair.

Jul 29, 2009 | 2004 Isuzu Rodeo

1 Answer

Heater / Air only work when blower is on set on high


You need to replace the blower speed control module, it is behind the glove box near the b;lower motor.

Oct 26, 2008 | 2001 Dodge Intrepid

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