Question about 1990 Nissan Pulsar

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The heater fan wont work on 123 but works fine on 4 if it iis a resistor where is it and how do i change it

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Under the right side of the dash on the a/c unit.

Posted on Mar 17, 2011

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Sounds like the resistor module is miswired.

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Heater fan only working on high setting.Settings 123 don't work.


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MY CAR BEEN LEAKING COOLENT AND NOW THE HEATER FAN ONLY WORKS ON 4 SPEED 123 WONT COME ON


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Nov 24, 2010 | 2000 Ford Focus

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2003 chev malibu blower fan not working in position #1,#2 ,#3.Works fine on #4,#5 Help please


its the heater fan resistor thats causing it. it has coils for different fan speeds, if a coil burns out or breaks. then you will loose that fan speed. to replace resistor, remove glove box to give ya more room so you dont have to stand on your head!! remove insulating panel under glove box. loosen and slide ecm to the side. now you can see heater blower fan, resistor is beside it, just remove wires , take out the hold down screws. and thats it!

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Heater switch on my ford foucs only blows on setting 4, 123 wont work why is this.


Dear Madam or Sir,

the problem with your Focus is the blower motor´s pre-resistor. This is a low-priced spare part (app. $15) and can be serviced in no time.

The pre-resistor is mounted to the blower motor´s assembly, change should be done in less than 45 mins of time at the shop.

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1999 dodge caravan,my heater fan only goes on at #4,its was working fine yesterday,any suggestion thx.


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Very easy to access, remove and install a new resistor.

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A/c fan wont blow now


Check the heater fan resistor.It is usually under the dash on the heater box near the interior fan.Common problem and not very expensive but depending in which country you live

Aug 13, 2009 | 2004 Mazda 6

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Heater wont work a fuse maybe? some how I doubt it. the rear window heater works. fan dead perhaps? no fan at all. not sure about heat.


Hi: Sounds like a possible heater resistor problem. First check to see if heater fan working, unplug heater under hood and put 12 volts to it from the battery with a wire (single black wire running to back of fan). If works then problem probably the resistor which is located on the fan housing under the hood to the right of the fan. The resistor has wires to it running from the heater fan, 2 - 7mm screws holding resistor in place, check resistor to see if any of the 3 elements are melted off, if so replace. Note: Rear window defrost has nothing to do with heater fan. Hope this helps...

Feb 26, 2009 | 2002 Chevrolet Blazer

1 Answer

2004 jeep liberty heater fan works on 123 but not on high


What do you mean you "went through a car"??? Did you crash???
Generally one speed being "out" is caused by a burned out relay or resistor pack. Check those!!!

Jan 11, 2009 | 2004 Jeep Liberty

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