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The hood fans seem to be running backwards. how is that possible on an ac motor?

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Any ac motor can go in reverse. The direction is chosen by the direction of the start winding. reverse the polarity of the start winding where you see the 2 extra crimp connectors where you wired the motor just swap them

Posted on Nov 28, 2013

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Posted on Jan 02, 2017

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Residential HVAC

Its always possible for a component like a relay to damage a motor. I normally see them run backwards due to a weak capacitor. A single phase motor is not supposed to run backwards but I've seen it many times. Ive seen a new motor run backwards, new capacitor, new air handler. To answer your question, its possible but likely it was the motor or relay.

Jun 16, 2015 | Heating & Cooling

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Y does 2004 ac pontiac grand am

Need more info. Do you mean the blower doesn't seem to run or do you mean it doesn't cool sitting at a stop? Does the blower run at all four speeds? Raise the hood. Start the engine. Turn on the AC to MAX and fan switch set to High. Go to the front of the car and see if the radiator fan or fans if it has two, are working. If they aren't you need to check the cooling fan relay and possibly replace. Cavalier's have only a single fan (not two) so when the cooling relay goes out it doesn't cool at a stop and begins to overheat as well. Not sure if the Grand Am has one fan or two at the radiator.

Jul 11, 2014 | Vehicle Parts & Accessories

1 Answer

Ac compressor fan running backwards.

Fan motors have rotations, clockwise and counter clockwise, lead end and opposite lead end. If you are looking at the motor from the fan blade side and the wires are on the back (opposite) side of the motor then you are looking at opposite lead end. Then you need to determine the rotation of the blade. It will scoop the air, so turning the blade that direction will give you the rotation. They also sell motors that you can change rotation by changing certain wires they have added.
When you replace a motor you need to notice the rotation and order that rotation. which end of the motor you are looking at to determine it. Then order the same rotation when buying the new one.

May 30, 2014 | Goodman CKL24AR24 Air Conditioner

1 Answer

My condenser fan is running backward

An abrupt cycle of power can cause a motor to run backwards. If you turn the power off again and wait 10 seconds or so (enough for blade to stop spinning) it should run the right way. Put the capacitor back the other way and try again.

Apr 23, 2017 | Heating & Cooling

1 Answer

2002 Mazda Milenia. Coolant level ok. In heavy traffic or at idle it runs on the hot side. Also my AC stops cooling

Troubleshoot your radiator fans. Could be the main one failed. The AC booster would have a hard time keeping engine and AC cool for more than a few mins.
Check the under hood electrical box. Fuse, relay. Possible the fan motor itself. Unplug it at the wire connector and jump 12 volts to it. No go, replace fan motor.

If this helps - Please vote.

Jul 27, 2011 | 2002 Mazda Millenia

1 Answer

The mobile home furnace back drafts when exhaust fans are running.

It almost sounds like the blower motors, have somehow reverse polarity and are running backwards. Strange as it may seem, it's possible. Also, check for and remove any obstruction in the flue pipe.

Apr 21, 2011 | Heating & Cooling

1 Answer

My rear AC blower dosent work. I dont seem to


Thanks for using Fixya!

check the wire terminals from the fan motor, its possible that they are loose. Also check the relays if they are good. Just swap out the other relays to test if it will work. These relays can be found in the fuse box under the dash or under the hood.

Have a great day.
- HotRatchet

Jul 26, 2009 | 2003 Chevrolet Suburban 1500

1 Answer

Just replaced fan motor and now it is freezing up

Even if the fan was backwards there would be some airflow. What is the ambient temperature and how long did you let it run? You should feel the air blowing out the back .

Jun 11, 2009 | Heating & Cooling

1 Answer

Blow back istead of suck out

This installation guide on the Jenn-Air web site does not provide electrical details, but there are two possible problems here.

1. - The fan could be installed backwards...or it moves air the wrong way

2. - The power wires might be connected incorrectly.

My best guess is that the fan uses a standard ac-powered motor, so the polarity of the wiring would not affect the direction it turns. If that is true, then the most likely problem is that the fan is installed incorrectly.

Good luck...and I hope this is helpful!!

Jan 17, 2008 | Jenn-Air JXT8030ADS Kitchen Hood

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