Question about 2003 Oldsmobile Alero

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Replaced resistor in july now i do not have high speed not sure if resistor was a bad one

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High speed setting has its own fuse under the hood check that. high speed actually doesnt go through the resistor.

Posted on Nov 18, 2009

Testimonial: "not sure for one thing my alero is a 2001 and i did have high speed it just stoped working i have all other speeds"

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Heater relay location 2008 dodge magnum


There isn't one. There is for the A/C compressor and blower though. The blower is controlled by the resistor. The resistor can blow low speeds or high speeds, some cut out. The resistor is bad. If you have no blower. Unplug it and add power and ground to it. If it blows high. Look to replace the resistor. It takes diagnostics to see if the controller/ dash gauges/knobs is bad.

Dec 18, 2016 | Dodge Cars & Trucks

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Low speed heater & defroster motor not working but high speed does


all older cars do this, the heater speed dropping reistor is blown
a cheap part.
it can only be 3 things, and a $10 voltmeter tells you which it is in 5min work
  1. bad switch 0v out
  2. bad resistor 12v in, 0v out.
  3. or bad wiring. (0v out)

the drawings are on alldata.com

but on all cars.
bad power to HVAC
bad controls (includes resistor block or new car modulators)
bad blower motor. (fails on high)
or bad damper if only some modes fail to blow.
and wires, it not necessary to say that "wires" ,its global to all electrics and electronics, it's a GIVEN.

im looking yours up now. to be accurate.
and it does have the block.
see red arrow that resistor is blown up.



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Dec 13, 2014 | 2002 Jeep Liberty

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

3 Answers

Heater fan only blows on high speed


most likely the resister. Not very expensive part and should be easy to change out if you know where its located ( usually under the dash) You can buy a repair manual for your model at any parts store, and be sure to ask the parts guy if he knows where its located. he might just be able to save you the cost of the manual. Good luck with it.

Nov 27, 2012 | 1998 Chevrolet Cavalier

3 Answers

My lower fan speed don't work except for the high, the fan high speed stay highest


Hello sanjuis24
It sounds like you've got a bad blower motor resistor. The resistor is located under the right side of
the dash at the blower motor. A new resistor is not very expensive and it's a fairly easy DIY.
Hope this is helpful

Mar 07, 2011 | 2003 Chevrolet TrailBlazer

3 Answers

The heater squeels when on the high setting and does not work on any other setting I am trying to find an online guide on how to change the blower motor or is it the blower motor resistor? its for a 2002...


Blower motor is bad. Resistor controls speed. Motor is so worn out that it will only turn when set on high. Best to replace it before it burns out something else due to the high current draw.

Feb 02, 2011 | 2002 Chrysler Town & Country

1 Answer

The heater blower motor on a '92 transport has been replaced but quit working again. Is there a resistor that has possibly gone bad? And if so where is it located?


THE BLOWER MOTOR RESISTOR CONTROLS ALL SPEEDS EXCEPT HIGH . IF IT DOESN'T WORK ON ANY SPEED, IT MUST BE A BAD MOTOR, OR BAD FUSE OR A BAD SWITCH. IF YOU HAVE HIGH ONLY, THE RESISTOR MAY BE THE PROBLEM & IS PROBABLY UNDER THE DASH, NEAR THE BLOWER MOTOR.

Jan 05, 2011 | Pontiac Trans Sport Cars & Trucks

1 Answer

Fan motor will only work when the switch is in the highest speed position


Having the year, make, model, and engine size would help.

But generally when this occurs it is a bad motor resistor. The resistor uses a set of resistors in series to drop voltage to control blower speed. The lowest setting uses all the resistors and the setting below high speed uses on resistor. Since none of the lower speeds work either the resistor for the setting just below high is burned out or the internal fuse has blown. Replacing the blower motor resistor should take care of the problem.

Oct 20, 2010 | Ford F-250 Cars & Trucks

1 Answer

Heater only blow on number 4 and heat coming out


You don't list the vehicle your asking about but in general when the blower motor only works on the high speed the blower resistors have blown. The resistors are what control the fan speed, when they go bad only high will work. The resistors blowing is usually a side effect of a blower motor going bad, pulling too much current. When replacing the resistors it's advisable to replace the blower motor as well so as not to have a repeat problem.

Aug 19, 2010 | Ford Festiva Cars & Trucks

1 Answer

Fan works on high only


Check your blower motor fan speed control switch. They go bad frequently. You could have checked the resistor by jumping the wires to the different terminals to be sure the resistor was good. That pretty much just leaves you will the fan speed control switch. Good luck.

Feb 24, 2009 | 1986 Chevrolet Corvette

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