Question about 1997 Chevrolet Cavalier

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A/c-heater fan only runs on top two speeds, lower speeds dont work at all.

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  • 2,841 Answers

The Blower Motor Resistor Pack is defective. Replace it.

Posted on May 31, 2010

  • robdawg Sep 21, 2010

    How do you replace it and where is it?

  • NOT ME Sep 22, 2010

    Purchase a new one at an auto parts store or dealership. It is located under the center of the dash.

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Heater on fiat ducatto only works on maximum setting.how to fix??


that sounds like fan switch you didn,t say what year some are vacuum operated will require finding connection under dash, if electrical just change switch

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Why won't my cooling fan turn on (swapped thermostat, thermoswitch, fan really)(fans work when hard wired to battery). Causes car to overheat in idle.


depending on the year, there should be 3 relays that control the fans.
There's a rad fan relay (4 pins), an a/c condensor fan relay (4 pins), and a fan control relay (5 pins). This allows them to be run at low speed or high speed. Check the grounds behind/under the righthand headlamp.
Check Fuses 57, 58 (30 Amps) and fuse 46 (15A) under the hood, and fuse 3 (7.5 Amps) in the driver's underdash fusebox.

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2000 malibu blower wont run on hi will run on 1-4 what could be my problem?


usually its the fan resistor causing this. it is located behind glove box on top of heater box, beside the fan. the resistor has differant size wires for differant fan speeds. if a wire in resistor is bad. that fan speed will fail. when fixing, the best way is to remove glove box so you dont have to stand on your head to work on it. have a good day !!

Jun 24, 2011 | 2000 Chevrolet Malibu

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My 1991 isuzu trooper heater blower fan is not working, nor when i turn it to the airconditioner the compressor does not engage. i checked all the fuses except the ac relay fuse block, what could the...


if the lower fan speeds dont work but the fastest speed does the heater fan resistor block needs replacing. If the highest fan speed doesnt work leave it on there and check for power at heater blower fan, if power is on one wire and the other is an earth the blower motor fan needs replacing. Use a normal globe test light to check this. If no power on any wires to fan go back and check all fuses in car and under bonnet with same test light. If fuses are ok possible open circuit wire to fan.

Jan 13, 2011 | 2004 Isuzu Rodeo

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The heater/ac fan on my Toyota Highlander only runs on high. When set at any of the lower settings, it is just 'off'. Is this a problem with the circuit panel that controls the entire heating/ac system?


usually when you loose some fan speeds. it is the heater fan resistor. it has differant size coils for each fan sped. if they fail you loose that fan speed. good-luck !

Jan 10, 2011 | Toyota Highlander Cars & Trucks

1 Answer

What the resistance does on top of the heater does it just tell the temperature?? it was find this moning and now i got no heat would it be my thermostat?


Assuming you mean the resistor on top of the fan motor ... That resistor controls the fan speed. Highest runs direct current to the fan, lower settings throttle the current down via the resistor.
If you mean the thermosensor on the engine coolant area, high resistance is cold, low is hot.

Dec 19, 2010 | 1993 GMC Sierra

1 Answer

Heater fan


Your fan technically only has one speed. The voltage is decreased by the use of a resistor pack to produce the slower fan speeds. If this resistor pack burns out, it will leave you with only the high setting. You can find the resistor pack located under the hood, on the passenger side on top of the fan housing.

Dec 15, 2009 | 2003 Ford Ranger Regular Cab

1 Answer

How to hook up heater motor to fan switch


The 3 resistor post should be the first 3 lower speeds on the switch. The high speed should be direct. Hope this helps.

Oct 25, 2009 | Chevrolet Camaro Cars & Trucks

1 Answer

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.

Oct 04, 2009 | 1999 Buick LeSabre

1 Answer

Heater fan only works on high after replacement of heater core


It's very possible the fan motor has quit. The squealing noise is caused from motor bearing failure. As the bearings wear out or dry up the motor is harder to turn and require more current to run the motor. On lower speeds, the motor runs off a series of resistors that reduce the amount of voltage and current so the fan runs a lower speeds. If the bearings are worn, there is not enough voltage or current to turn the motor and that's probably the humming noise your hearing.
Good observation by the way.
Let me know.
regards,

Feb 13, 2009 | 2001 Chevrolet Prizm

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