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Re: Blower blows high flow only
What about the control switch, did you change it????? usually the switch will only run on one speed. mesna the switch is bad. You could pull the switch off, and get a jumper wire and cross the other speeds out to see if they will work.
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Unlikely a blower motor resistor problem. If the resistor is faulty. the fan speeds will not work/fail on the lower speeds. High speed will normally always work. If the fan is non operational suspect a fan motor issue.Bad fan motor/switch/wiring to it
"I checked all the fuses.." There is only one fuse, the 20A WIPER one in the instrument panel fuse panel which energizes the blower motor relay. The panel also contains the BLOWER circuit breaker which supplies power to the relay. If these parts check OK, there will be 12 volts on terminal 87 of the relay with the engine running and 12 volts on the BLU wire connected to the blower motor. If you set the function selector switch to any position other than OFF, the blower motor should operate at a speed you select by rotating the blower switch. If this doesn't happen, rotate the blower switch to HIGH. If still nothing, the thermal limiter in the blower motor resistor may be open. If still nothing, the function selector switch, the blower switch, the resistor or even the blower motor itself could be defective
REPLACE BLOWER MOTOR RESISTOR. IF YOU GET ONLY ONE CONTROL SPEED.IF YOU HAVE ALREADY REPLACE BLOWER MOTOR RESISTOR.BLOWER MOTOR CONTROL SWITCH BAD. REASON BLOWER STAY ON ALL THE TIME.FAN BLOWER MOTOR RELAY BAD.
May be but next to the blower motor is the blower control module this has a series of resistors in it to change the current flow to the blower motor ,.When you call for high speed on the fan it bypasse's the resistor module, on all other speeds it runs through the resistor. so check for power going into the blower module from the control panel on some speed other than high if power is at the module control panel is ok. if not blower module is bad
Hello Travis. If yours is dual zone, I believe the resistor (blower control module) is a solid state. Did you check it using the fan speed selector and test the voltage output on the purple wire? The gray black wire going into the resistor is a variable voltage output from the heater control panel. This signal is amplified by the resistor/blower control module. The black wire out of the resistor also needs proper good ground. There is a fuse in the underhood relay/fuse panel that feedback from the resistor output to the blower (purple wire) is also fed back to the heater control panel. Verify this fuse is good.
When blower motors go bad they will often absorb a lot of electrical current. This current has to go through the blower control/resistor and will often burn them out due to the heat developed from the high current load. These resistors are also mounted in the airflow out of the fan motor to help cool them so if the fan is still drawing current and not blowing the resistor overloads and burns it out. Not sure how you tested the resistor but I suspect yours is faulty. If you would like more advise let me know.
Check the blower motor speed control resistor pack is ok. (The resistor pack is usually located in the blower fan ducting in the air flow). Check condition of electrical connection terminals on the blower motor circuit - these terminals pass considerable current and over time may fatigue overheat and loosen. Check operation/replace any blower motor control relay, Check the blower motor will run if +12v directly applied to the blower motor. Check operation of the blower motor speed control switch is ok.
If the fuse is blown for the blower then there is a short, that is not an answer, go to the blower and check to see that the blower motor connector has 12 volts to it when the blower is set to high speed on control, if it does then u need a new blower motor, if it doesn't then the control switch is defective or the blower motor speed control resistor is defective.