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need to check switch,resistor and fan ---ur switch might have resistor built in it would need to be tested for continuity for the other speeds --if your truck [didnt specify which ] has a separate resistor it should be attached to the heater fan motor housing again resistor needs to be tested -also test ur fan for any resistance or overheating
Check the speed resistor for opens. It's located near the motor. It has a plug with 4 wires going to it. The resistor itself is mounted on the fan housing so air from the fan can cool it.
if only on low speeds it's the blower resistor-if nothing at all blower motor/mice/stuff in swirl cage(fan)or the switch-all need investigated if completely dead
Hi,
Don't go there just yet ! Most heater motor speed problems relate to the heater resistor ! It's located in the ducting close to the motor assy and usually has 4/5 wires on to it and a 2 screw fixing. This componant must be cooled (hence air duct location) and is solely responsible for motor speeds ! You can check motor fan by test lamp/meter ! Good Luck
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.
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