Question about 2004 Kia Sedona

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Fan not turning, but motor is humming My fan comes on only when the a/c is on, is that normal?

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Yes it is normal. The engine has to work slightly harder while the A/C compressor is on so that is why there is a fan there to cool the engine off. Some vehicles have two fans, the first works like yours and the second one comes on when the coolant temperature sensor calls for it.
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Posted on Feb 19, 2009

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I have a 2002 Grand Am SE, my heat works fine, temperature wise, but doesn't flow out of my vents very well. Whenever I turn the heat on I hear a loud humming/vibrating sound coming from my blower...


I had a very similar problem on a Buick recently. Like mine, your blower's fan blade assembly may have come loose from the motor shaft. There is a very small washer type clip that holds the fan blade part to the motor's shaft. Usually the whole blower assembly is pretty easy to get to and take off...usually. A lot of GM cars had the assembly accessed from the firewall behind the engine. You would need to pull the blower motor out and check the fan assembly.

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The fan is normally used for both heating and cooling. Check the owners manual for the fuse location and see if it is blown. If so, replace it and try the fan again. If the fuse blows again, the motor is probably seized and will need a mechanic to oil and free or replace it. If you can get to it your self, BE CAREFUL, and touch the motor when it is turned on. if it gets hot without turning, it is probably electrically OK and seized. If it does't get hot or hum and the fuse is OK, Its either bad or has a problem that will need to be traced. Best to take it to a GOOD mechanic that you trust. Trouble shooting can get complicated.

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please follow this steps and fix it.
A fan failure, or a failure of the fan relay or control circuit is bad news because it can allow the engine to overheat.
Five things may prevent an electric cooling fan from coming on:
  • Defective temperature switch or coolant sensor
  • Engine thermostat is stuck OPEN (engine never gets hot enough to turn on the fan)
  • Failed fan relay
  • A wiring problem (blown fuse, loose or corroded connector, shorts, opens, etc.)
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ELECTRIC COOLING FAN QUICK CHECKS.
One way to quick check the fan circuit is to start the engine and turn on the A/C to max. If the fan runs, the fan motor, relay, fuse and wiring are all okay. But this test doesn't show if the temperature switch or temperature sensor and PCM are energizing the fan when coolant temperatures are high.
To check the temperature at which the fan comes on, turn the A/C off and keep the engine running until it reaches normal operating temperature. Most fans should come on when the coolant reaches about 200 to 230 degrees. If the fan does not come on, something in the control circuit is defective. Resistance checks should then be made on the temperature sensor or switch, and a voltage check on both sides of the relay (you will probably need a wiring diagram of the fan cooling circuit on your vehicle to identify the relay terminals and wiring connections).
The fan motor itself can be checked by using jumper wires. Unplug the wiring connector on the fan, and use the jumper wires from the battery to route power directly to the fan. If the fan motor is good, the fan should spin at normal speed when supplied with 12 volts. Noisy bearings or a slower than normal speed would indicate a worn motor.

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My 1998 buick regal non turbo 3800 radiator cooling fans will not work when the car gets to operating temp. The fan motors will work whtn the AC is on. I think it could be the temp sensor that turns on the...


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The indoor and outdoor unit have separate breakers,so one can run with the other.It would not cool. Check the separate breakers to be sure their on.Take the cover off the t-stat, you will see a red and a green wire.remove these and touch them together.If the fan runs you probably have a bad thermostat.If it does not .The problem is inside the indoor unit.There is a disconnect or breaker on the cover. remove it, pull the cover off and put the dis connect back in.If the fan hum ms or turns slowly you have a bad capacitor or fan motor. Try the cap. first,if still not running the motor is most likely the problem.Should the motor not try to run or hum,it could be a blown fuse, you will see it in a small circuit board if you have one.It could be the circuit board itself,or a bad fan relay.A meter can help you trace this if you have one.Be careful as there is 220 volts powering this unit.Good luck

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