The fan only blows when it is on high. The compressor pulls in on lower settings, but the fan won't come on. I show power to the blower anytime the it is turned on. Does the switch control grounding instead of power?
Should I read different voltage when the fan is on low versus high or mid?
Does the thermostat switch inside the housing control the blower? Thanks, Mike
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Use a jumper wire and jump 12 volts to the blower moter and see if it comes on, make sure that you have a good ground. If the motor does not come on then it is going to be the blower motor.. hope that helps mmkayyyy
I'm going to start from the beginning. The blower motor gets power from the high blower relay and it is grounded thru the fan switch and the resistor. So you should have power on the pink white blower wire coming from the high relay to the blower motor. The orange black wire from the motor is ground going to the resistor and fan switch. The blue wires on the control panel are for the ac compressor. The high blower relay gets power from fuse number 5 in the box. The blower motor is grounded thru the resistor and then thru the fan switch. Photo courtesy of AutoZone.com
Check to see if you are getting voltage to the blower motor if you are the motor is bad if not check the fan speed switch. 1 2 3 or low medium high if you get voltage going to the switch but not from replace the switch if you have voltage from switch check the blower motor resistor the although with the blower resistor you commonly have a high fan speed in the max setting and the lower speed settings don't work wich would make you think 1 2 3 are not working but 4 is. That is why it is best to check all parts to make sure the part you do replace needed to be replaced
Yes - you diagnosed the problem yourself. The classic symptom of a heater that only blows on the "High" setting is a burned out/damaged or otherwise inoperative blower resistor. Replacing the resistor should return the two missing blower fan speeds.
Sounds like a seized up (bad bearings) blower motor. It may not pull enough current to blow the fuse at the lower fan settings but does at the high one. Something could also be jamming the blower fan in its air duct.
Most blower motors can be accessed under the hood. Replace the fuse then put the blower switch on one of the lower settings (don't blow the fuse). Get yourself a good sized screwdriver and hit the back of the blower motor with the screwdriver handle a couple of times.
Sometimes (unless the blower motor has totally seized up) you can get it to spin and this will tell you for sure you need a new blower. Other than that, you can get a spare blower motor, remove the connection wires from the old motor and hook them up to the new one to test before you go to the trouble of replacing the blower.
The low speeds(all of them) are distributed threw the fan speed switch to the blower motor resister.The resister is the problem.It is located very near the blower motor.It has two screws mounting it to the blower box.It has a plug in with about 5 to 7 wires.Unplug this plug to the resister.Remove the screws.Pull the resister toward you,it mounts and rest inside of the blower case,this is how it is cooled.Now when you replace the resister,replace the blower motor.Even if the bower motor is running fine, it is pulling to many amps for the resister.It will happen again soon,if you don`t replace the blower motor.If I can help you any more,please let me know.