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Re: Heater and or A/C blower fan not working in Low, Med...
Please check the resistor block. this is the part that controls the speed of the fan motor. it is usually found in the blower housing or in the evaporator housing. it has 4-5 wires on it and the last big blue wire normally goes straight to the blower motor. there should be resistance on all pins of the resistor block.
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The blower resistor has gone bad which is why you lost blower speeds.This may have been caused by the blower motor drawing too much power. At this point I would verify that no fuses burned out and then check the pigtail plugs going to the resistor and blower motor to make sure the connectors and connections are not melted or wiring is frayed. These connectors are located in the engine compartment on the passenger side. After checking this and if everything appears ok then the blower motor itself has probably gone bad and needs replaced. I would also replace the blower motor resistor as well. If the connectors appear damaged replace or repair as needed .
It's marked AC and it's in the under hood fuse relay center, near the battery. The ballast resistor can fail too it's the device that if you follow the wire from the blower motor, it's in the heater box next to the blower and it can be unpligged , melted and just bad. Connect a test light between the two wires that connect to the motor, and with the key on, work the heater controls, to see if the light will come on in any position, wiggle the connections watching the light. If it's not working you might still have power so connect the test light between the body ground and the wires to the motor and you can find that you have power but not ground. The blower relay in in the firewall fuse relay center, standing in front of the car behind the engine it's the third relay from the left, under the Maxi fuse panel. This panel has two black covers and it's under the left one. The resistor is right under this fuse panel and it can have two plugs connected to it. The two wire connector is just power and ground. and it's on all the time the power from the maxi fuse. The maxi just makes the high speed though the relay and the lower speeds are controlled by the number 50 fuse in the insrument panel fuse panel number 50 it's a 25 amp fuse (clear)
Sounds like low speed coil in the Blower Fan resistor block has failed. The Blower Fan Resistor Block is usually located in the air ducting adjacent to the Blower Fan. The Resistor Block consists of 3 or 4 coils of special resistance wire attached to terminals which connect to the wiring that comes from the fan switch and then to the Blower Fan. The block is on the output side of the fan unit so that the airflow from the fan past the coils inside the duct assists in preventing them from overheating and burning out. Access to the Resistor Block is from under the dash. To replace, remove the multi-pin connector and then undo the screws holding in the block. Check air duct for leaves and dirt which may have caused the coils to fail. .Replacement is the reverse procedure
It could be your blower switch, but more than likely it's a resistor that is usually a part of the blower assembly, and it operates the speeds. Doesn't cost much but can be tricky installing. If you had one or two speeds not working, initially, eventually all may stop. If fan stopped working and all speeds had been operating, then you may have a bad wire or blower motor. Also, check your manual for fuses, as there may be a compartment inside the vehicle as well as one under the hood.
TRY THE BLOWER MOTOR RESISTOR FIRST. POWER GOES THROUGH THE BLOWER THEN TO THE RESISTOR AND THEN THE CONTROL MODULE TO GROUND.
THE RESISTOR IS ON THE BOTTOM OF THE HEATER CASE ON THE PASSENGER SIDE. USING A TEST LIGHT ATTACHED TO GROUND TOUCH EACH OF THE TERMINALS ONE AT A TIME WHILE SWITCHING THE POSITIONS ON THE BLOWER CONTROL. IF THAT WORKS YOU WILL HAVE A LIGHT FOR EACH WIRE IN EACH POSITION ON THE DIAL. THE RESISTOR IS THE PROBLEM THEN.
RESISTOR WIRE COLORS LOW = YELLOW 2 = TAN 3 = LIGHT BLUE HIGH = ORANGE
Using a voltmeter, the resisted voltage values for the fan motor are as follows:
LOW- 3 VDC
Med LOW - 6 VDC
Med HIGH - 9 VDC
High - 12 VDC
The fan resistor gets 12 volts from each position of the fan switch, and the 12 VDC is then lowered thru each of the 3 internal resistors inside the fan resistor. My guess is that the resistor has failed, and the resistance wires contained on it may have meshed together. The resistor is on the black box between the blower motor housing and the center of the dash. 2 phillips screws hold it in. Easy to remove/replace. Hope this helps, and thanks for choosing FixYa.