My fan motor turns on and off intermittenly, I tried replacing the blower resistor first cuz it was $20.00 vs. $200.00 and I really can't afford the $200.00; is there another alternative or do I need to bite it and get the blower fan? This is in regards to a Florida car, the air conditioner will blow cold but it won't stay on, regardless of the fan speed setting I have it on.
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Re: Intermitent Fan Functions
If the blower is functional intermittently it could be a couple of different things. Seems as you have already replaced the resistor I would say you should replace the blower thermostat. the device the determines when the blower will kick on is a thermostat. If it is inaccurate it could likewise casue your problem. The best part of all is that in the case of your air unit, its electrical components will all **** out at around the same time, so replacing the component first won't hurt. There is however also a possibility that the blower it self is going ut and therefor is shutting itself off due to drawing to much power and heating up.
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Try to check the power and ground on the blower fan. If you missing the ground on the blower fan connector than most likely it is the blower fan resistor (controller), it is located under the hood close to back firewall behind left cylinder head.
A/c compressor works fine and the blower motor works and shutdown right? it is the problem with the blower resistor or with blower motor relay. try to direct the resistor irrespective of the speed. hope the problem may be solved.
Power goes thru the rear blower relay, then the resistor and motor. The fan control switch provides the ground connection. I would check the rear blower relay if power is questioned at the blower motor.
replace the blower motor resistor. It controls the fan speeds. It defaults to high speed only when it fails.
How to replace the blower motor resistor block:
Caution: Stay clear of the blower motor and resistor block (Hot). Do not operate the blower motor with the resistor block removed.
1. Disconnect and isolate the battery negative cable. 2. Remove the glove box from the instrument panel. 3. Pull out the lock on the blower motor resistor wire harness connector to unlock the connector latch. 4. Depress the latch on the blower motor resistor wire harness connector and disconnect the connector from the resistor. 5. Remove the two screws that secure the blower motor resistor block to the HVAC housing. 6. Remove the resistor block from the HVAC housing.
Installation: 1. Position the blower motor resistor block into the HVAC housing. 2. Install the two screws that secure the resistor block to the HVAC housing. Tighten the screws to 2.2 Nm (20 in. lbs.) 3. Connect the wire harness connector to the resistor block. 4. Push in the lock on the blower motor resistor wire harness connecgtor to lock the connector latch. 5. Install the glove box. 6. Reconnect the battery negative cable. 7. Have a nice day!
It isn't the switch it needs a new blower resistor and new fan motor.
The fan motor will start to pull too many amps through the resistor and in turn smokes the resistor. You can replace the resistor and it will temporarily fix the problem but eventually the fan motor will end up overloading the new resistor and ruining it.
Replace both the resistor and the blower motor. The resistor is located on the firewall inside of vehicle on the passenger side. If I remember correctly it is a bit of a ****** to get to the screws.
Also if you have automatic temperature control the GM part number for the resistor should be 89018643
The resistors are in circuit only on the lower fan speed settings.
On the highest speed setting, power is switched directly to the fan motor.
Check fan power supply fuses,
Check power is available to the fan when high speed selected.
If all above OK, apply power directly to the motor to verify fan motor runs- if it doesn't the motor may need replacement/repair.