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Fan for ac/heat does not work on lower settings

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The blower motor resistor is bad.Replacing that should fix the issue.In addition it is possible that the blower motor may have caused the resistor to go bad. If that is the case then the blower motor should be replaced as well.

Posted on Jun 01, 2010

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Posted on Jan 02, 2017

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Have a 2009 Nissan Quest I can't turn the heat off. Just stays on a high level of blowing out heat .


If you have a fan that has different speed settings (1234, or low med high etc) and the only one that works is high - then the blower resistor pack has failed. If you have a climate control unit (where you just pick a temp you want) then the fan is controlled by the heating system and it sets fan speed. If you have climate control style try lowering the temp to a lower setting (current temp in vehicle) and see if fan slows down. If not then climate control unit or fan resistor bad. If dial type and you get nothing on lower settings (only high works like mentioned above) you need to change blower resistor. It is located under dash near the fan itself. Look for small unit bolted in duct near fan with wire plug going to it.

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Ac fan not working, ac is cold but fan won't blow air into cab...


check the fan itself to see if it works. check the heater fuse first! if all is ok, you probably have a bad heater fan resistor. to check blower, please go here on pc for info on blower. .cargurus.com/Cars/Discussion-t16272_ds569146

May 21, 2014 | Cars & Trucks

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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 !

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My 2003 saab 9-3 fan for my heat and AC stopped working, what could possibly be the problem? My car was just snowed in 3 feet of snow, so could the negative temperatures and snow be affecting it?


Quite possible that the fan has quit due to the lower temperature as the thermistor is set Up. Now this can be confirmed once the car is warming up to go beyond the set engine temperature.
So unless this is confirmed all that you need to do is to check if there is a fuse link break to the fan motors.

Dec 13, 2010 | 2003 Saab 9-3

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THE BLOWER FAN ONLY WORKS ON HIGH - THIS IS THE CASE WHETHER THE HEAT OR AC IS ON.


Different speed settings on the blower motor is achieced by using resistors mounted on a circuit board usually fitted in the airstream of the system. For the highest speed setting the blower motor is connected directly to the battery (by way of the switch of course). Lower fan speeds are achieved by lowering the voltage(using a resistor between the battery and fan). These resistors get pretty hot and sometimes burn through thereby not letting power through to the fan motor. The first place to start looking would be under the passenger side dash. Look for a connector plug in the ducting close to the fan motor with at least 3 wires connected to it. On the Silverado for instance it is accessed from below the glovebox, there is a large plastic cover that needs to be removed first. It is fitted to the fan housing.

Oct 18, 2010 | Chevrolet Silverado 1500 Cars & Trucks

2 Answers

Heat & AC blower (fan) does not come on. Just


if it worked on some settings and not on others then the blower motor resister has gone bad. its mounted on the heater box near the fan about half way up the heater box. they are cheap and easy to change. give that a try first

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My sc1 over heats when at idle and only if ac or heat is turned off as soon as i turn onn ac heat drops imediately


you may want to check on the radiator fan. The AC has its own fan and once AC is on, the fan would help bring down the temperature. It is either the fan is not blowing or has become weak. You can check on the fan by pulling out the temp sensor on the lower radiator hose. The fan should blow at full speed when doing this.

Check on the water reserve the water inside it goes down, if not there may be a leak somewhere. Water vapor may be escaping and lessening the effectiveness of the cooling system. This may be a reason why the engine cools down after the AC fan is on.

Jun 16, 2009 | 1995 Saturn Sc

1 Answer

'88 Camry AC buttons not working


fan speed controler could be bad, fan motor rellay could be bad.

Apr 14, 2009 | 1988 Cadillac Sedan DeVille

1 Answer

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Sounds like the wheel bearing on the right rear hub may be defective, that would cause the noise if the tires are ok. As far as the fan goes not sure this isn't working as designed.

May 02, 2017 | 2005 Nissan Altima

1 Answer

2005 jeep grand cherokee 4.7 Ac fan lost the 3 lower settings, only the high setting still worked. For a while the lower fan settings would just come on, and then go out again. The high fan setting...


Well, the blower resistor handles the lower speeds and the hi-blower relay handles the hi speed only. if the fan still works on the lower speeds then the resistor is bad. if the fan doesn't work at all then your motor has failed and or burn't the relay out also. if you can get your blower to start by hitting the kick panel above the pass. side foot area then the motor is bad. if you are handy enough to drop the kick panel and access the motor then check the connections at the motor. Then wack the motor and see if it comes on then. you will most likely find the problem if you follow those simple rules above. Good luck.

Jul 31, 2008 | 2001 Jeep Grand Cherokee

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