Question about 2003 Oldsmobile Alero

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Only works on high speed (fan switch) - 2003 Oldsmobile Alero

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It sounds like the blower resistor needs to be replaced. Auto Zone will have the blower resistor that you need to replace and will have the step by step instructions for you to get the job done with common tools and will take just under 2 hours if your good with tools. Good luck and keep me posted, the cost of the resistor it self is around $27.00

Posted on Nov 16, 2009

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I replaced the blower motor resister and the heater control unit and it still only blowes on hight what could it be

Posted on Jan 27, 2012

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Blower motor resistor located near blower motor in heater box has burned. suggest new resistor card

Posted on Nov 16, 2009

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2 Answers

Blower fan not working


The resistor bank is bad for slow speeds, the switch is bad for high speed. In your test, you have voltage, but the switch wont carry the amps, to run high speed. Open circuits will not blow fuses. Replace both switch and resistor bank for all speeds. Make sure to clean leaves and trash from fan housing and see if fan spins freely.

May 17, 2017 | Cars & Trucks

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A/c blower stop working all speeds, check have power, ground out speed sensor and fan comes on, replaced speed sensor, now fan just works on high when wiggling fan switch, I replaced fan switch, now...


Depending on the year and model, you should have a resistor that controls fan speed. Not sure what a speed sensor is.
On most import cars, the speed is controlled by the ground circuit. If you have power and the fan will run if you ground it, check the fan switch again and the resistor. Then look at the ground for the switch.

Jul 17, 2012 | Hyundai Santa Fe Cars & Trucks

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Fan only works high speed. For AC compressor runs but no fan other than when switched to high speed at which time the fan runs at high speed but AC switches off.


I have the same problem on my 1999 Jetta have you gotten any responces yet if you do please email me the solution rohintz@gmail.com Thank you Rick

Jun 13, 2011 | 1999 Volkswagen Jetta

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I have a 2004 Pacifica and the blower motor runs on high all the time, can't get it to work on slower speeds


The high blower works off a relay in the high speed only so the fan switch is at fault on your vehicle
Replace the fan blower control speed switch which is the one you adjust the lower fan speeds

Jun 15, 2010 | 2004 Chrysler Pacifica

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Toyota 2000 camry fan only working on high speed


The blower motor resistor pack is defective and must be replaced. The resistor pack controls the variable speeds.

May 01, 2010 | 2000 Toyota Camry

1 Answer

The only speed on my heat/air fan the will work is high. All other speed quite at the same time. Would this be the fan motor or could it be a fuse?


It is most likely the fan switch, all the low speed work through a resistance, the full speed does not, there is only one fuse for the fan so if it works on high its ok and you say the fan works on high so the fan itself is ok

Apr 17, 2010 | 2005 Ford Taurus

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Location of low speeds heater fan fuse & switch. I do not have a owners manual.


the switch is on the dash with the other a/c controls. does the fan work at all? high speed OK? but the lower speeds dont work? if any speeds other than high dont work, replace the blower resistor.

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1 Answer

2003 Ford Expedition XLT FX4 MAIN FAN CONTROL SWITCH


That usually means the circuit board for the fan motor is Burt out big job prob to replace dealer may be.

Jan 22, 2009 | 2003 Ford Expedition

3 Answers

Heat/AC Blower fan speed only works on High


Alot of people have the same problem with the fan switch and blown bulbs. There really is no fix for this. Jeep really screwed up when designing the heater control assembly. The cheapest solution is to buy another unit off Ebay. Can always go to the dealer but be ready to PAY for there mistakes.

Jan 14, 2009 | 2005 Jeep Grand Cherokee

2 Answers

The Fan speed has stop working on all setting except high/


so your fan stopped working on all settings but high....? sounds like a bad switch...i know alot of jeeps and fords have that problem....lemme know....might hafat add another car to the broken fan switch list....lol

Sep 30, 2008 | 1997 Pontiac Grand Prix

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